Horizontal and Vertical Geodetic Control Data for the Unites States.

SDE Feature Class

Tags
The geographic limits of USA including trust Territories, NSRS, geodetic, horizontal control, vertical control, ellipsoid height, benchmark, orthometric height, latitude, longitude, N/A, N/A


Summary

Provide a base of reference for latitude, longitude and height throughout the United States.

Description

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

Credits

NOAA, National Geodetic Survey and cooperating organizations

Use limitations

Not restricted; Geodetic Data, including software were developed and compiled with U.S. Government funding; no proprietary rights may be attached to them nor may they be sold to the U.S. Government as part of any procurement of ADP products or services.

Extent

West  -94.615490    East  -89.691664
North  36.499434    South  33.004444

Scale Range

ArcGIS Metadata 

Topics and Keywords 

*Content type  Downloadable Data


Place keywords  The geographic limits of USA including trust Territories

Stratum keywords  N/A

Thesaurus
Title N/A




Temporal keywords  N/A

Thesaurus
Title N/A




Theme keywords  NSRS, geodetic, horizontal control, vertical control, ellipsoid height, benchmark, orthometric height, latitude, longitude

Thesaurus
Title geodesy




Citation 

Title Horizontal and Vertical Geodetic Control Data for the Unites States.
Publication date 2020-05-10


Edition latest available


Presentation formats  hardcopy diagram
FGDC geospatial presentation format  Diagram


Series
Name N/A
Issue N/A

Other citation details
Questions concerning this data may be addressed to NGS Information Services Branch EMail - ngs.software@noaa.gov Phone - 301-713-3242



Citation Contacts 

Responsible party
Organization's name NOAA, National Geodetic Survey
Contact's role  publisher


Contact information
Address
Delivery point NOAA Campus, Silver Spring, MD



Responsible party
Organization's name NOAA, National Geodetic Survey
Contact's role  originator


Resource Details 

Dataset languages  English (UNITED STATES)


Status  completed
Spatial representation type  vector


*Processing environment  Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.0.8321


Credits
NOAA, National Geodetic Survey and cooperating organizations

ArcGIS item properties
*Name asdi.LOCATION.GEODETIC_CONTROL_NGS_2020
*Location Server=170.94.248.50; Service=sde:sqlserver:170.94.248.50; Database=asdi; User=location; Version=dbo.DEFAULT
*Access protocol ArcSDE Connection

Extents 

Extent
Description
retrieval date

Temporal extent
Date and time 2020-05-10

Extent
Geographic extent
Bounding rectangle
West longitude -94.6
East longitude -89.7
South latitude 33
North latitude 36.5

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -94.615490
*East longitude -89.691664
*North latitude 36.499434
*South latitude 33.004444
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude -94.615490
*East longitude -89.691664
*South latitude 33.004444
*North latitude 36.499434
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Individual's name NGS Information Services Branch
Organization's name NOAA, National Geodetic Survey
Contact's position Information Specialist
Contact's role  point of contact


Contact information
Phone
Voice 301-713-3242
Fax 301-713-4172

Address
Type both
Delivery point SSMC3/9202 1315 East-west Highway
City Silver Spring
Administrative area MD
Postal code 20910
Country US
e-mail addressngs.infocenter@noaa.gov

Hours of service
7:00am to 4:30pm EST

Contact instructions
Prefer EMail



Resource Maintenance 

Resource maintenance
Update frequency  continual


Resource Constraints 

Legal constraints
Limitations of use
The distributor does not assume liability

Other constraints
Geodetic Data are in the public domain, not restricted from access or distribution.

Security constraints
Classification  unclassified
Classification system DOD


Additional restrictions
none



Constraints
Limitations of use
Not restricted; Geodetic Data, including software were developed and compiled with U.S. Government funding; no proprietary rights may be attached to them nor may they be sold to the U.S. Government as part of any procurement of ADP products or services.

Spatial Reference 

ArcGIS coordinate system
*Type Geographic
*Geographic coordinate reference GCS_NAD_1983_2011
*Coordinate reference details
Geographic coordinate system
Well-known identifier 104145
X origin -400
Y origin -400
XY scale 1111948722.2222221
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 8.9831528411952133e-09
Z tolerance 0.001
M tolerance 0.001
High precision true
Left longitude -180
Latest well-known identifier 6318
Well-known text GEOGCS["GCS_NAD_1983_2011",DATUM["D_NAD_1983_2011",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG",6318]]

Reference system identifier
*Value 6318
*Codespace EPSG
*Version 8.5(10.2.1)


Spatial Data Properties 

Indirect spatial referencing
Geodetic Data- horizontal positional datum conversion, use program NADCON (version 2.1) Geodetic Data - vertical positional datum conversion, use program VERTCON (version 2.0) These programs provide indirect spatial reference data and are available from NOAA, National Geodetic Survey at <http://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml>


Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name asdi.LOCATION.GEODETIC_CONTROL_NGS_2020
*Object type  point
*Object count 11260



ArcGIS Feature Class Properties
Feature class name asdi.LOCATION.GEODETIC_CONTROL_NGS_2020
*Feature type Simple
*Geometry type Point
*Has topology FALSE
*Feature count 11260
*Spatial index TRUE
*Linear referencing FALSE



Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Conceptual consistency
Measure description
FGCS sponsored testing in cooperation with equipment manufacturers and National Institutes of Standards and Technology, Gaithersburg, MD 20850





Data quality report - Completeness omission
Measure description
This dataset DOES NOT include destroyed marks. All other non-publishable marks are NOT included. Non-publishable criteria is available at <http://www.ngs.noaa.gov/cgi-bin/craigs_lib.prl?HELP_NONPUB=1>





Data quality report - Quantitative attribute accuracy
Measure description
Horizontal control stations (those with precise Latitude, Longitude) were established in accordance with FGDC publications "Standards and Specifications for Geodetic Accuracy Standards" and "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques" The final Latitude, Longitude of these stations were determined by a least squares adjustments of the horizontal observations. Horizontal control station have Latitude, Longitudes displayed to 5 places and are identified by attribute POS_SRCE = 'ADJUSTED' Lesser quality Latitude, Longitudes may also be preset in the dataset. These are identified by a POS_SRCE attributes HD_HELD1, HD_HELD2, or SCALED. These lesser quality positions are described at: <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED> Vertical control stations (those with precise Orthometric Heights) were established in accordance with FGDC publications "Standards and Specifications for Geodetic Accuracy Standards" The final Orthometric Height of these stations were in most cases determined by a least squares adjustments of the vertical observations but in some cases may have been keyed from old survey documents. Vertical control stations have Orthometric Heights displayed to 2 or 3 places and are identified by attribute ELEV_SRCE of ADJUSTED, ADJ UNCH, POSTED,READJUST,N HEIGHT,RESET,COMPUTED Lesser quality Orthometric Heights may also be preset in the dataset. These are identified by a ELEV_SRCE attributes GPS_OBS, VERT_ANG, H_LEVEL, VERTCON, SCALED. These lesser quality orthometric heights are described at: <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED> IMPORTANT - Control stations do not always have both precise Latitude, Longitude AND precise Orthometric Height. A horizontal control station may have a orthometric height associated with it which is of non geodetic quality. These types of heights are displayed to 0, 1, or 2 decimal places. Worst case being off by +/- 1 meter. LIKEWISE - A Vertical control station may have a Latitude, Longitude associated with it which is of non geodetic quality. These types of Latitude, Longitudes are displayed to 0, 1 or 2 decimal places. Worst case being off by +/- 180 meter. Refer to <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED> for a description of the various type of methods used in determining the Latitude, Longitude, and Orthometric Height. Attribute POS_CHECK and ELEV_CHECK indicate whether or not an observational check was made to the position and/or orthometric height. Care should be taken when using "No Check" coordinates. If attribute ELEV_SRCE = 'VERTCON' then the Orthometric Height was determined by applying NGS program VERTCON to an Old NGVD 29 height. In most areas VERTCON gives results to +/- 2 cm. See <http://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html> for a more detailed explanation of VERTCON accuracy. Ellipsoid Heights are also present in the dataset. The ellipsoid heights consist of those determined using a precise geoid model, which are displayed to 2 decimal places and are considered good to +/- .005 meters, and those displayed to 1 decimal place and are considered only good to +/- .5 meters



Quantitative test results
Value 95 percent confidence level for geodetic quality data.


Evaluation method
Geodetic Data are continuously being processed; their standards and specifications are being reviewed for next publication release. "Standards and Specifications for Geodetic Control Networks", 1984 and "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0 1989, are most current published documents.





Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description
The description of tests are explained in "Geometric Geodetic Accuracy Standards and Specifications For Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0, 1989.



Quantitative test results
Value .05 meters for highest order of accuracy


Evaluation method
Horizontal positional accuracy statements pertain to horizontal control stations only. i.e. Those with geodetic quality Latitude, Longitudes. Positional Accuracy explanation contained in "Geometric Geodetic Accuracy Standards and Specifications For Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0, 1989, (See table 1, p6). with the exception of Order A and Order B which have an accuracy of as described at: <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=HORZ%20ORDER>





Data quality report - Absolute external positional accuracy
Dimension vertical


Measure description
The description of tests are explained in "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0, 1989, (See table 1, p6).



Quantitative test results
Value .05 meter for highest order of accuracy


Evaluation method
Vertical positional accuracy statements pertain to vertical control stations only. i.e. Those with geodetic quality Orthometric Heights. Orthometric Height accuracy explanation is contained in FGDC publication "Standards and Specifications for Geodetic Control Networks" with the exception of vertical control of class 0 POSTED and READJUSTED Heights which are described at: <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=VERT%20ORDER> Ellipsoid height accuracy explanation contained in "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0, 1989. (see table 1, p6). The accuracies for ellipsoid heights are described at: <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=ELLP%20ORDER>





Lineage 

Process step
When the process occurred
Indeterminate date inapplicable
Description
The National Geodetic Survey produces geodetic data. Geodetic data comprise the results of geodetic surveys to determine, among other things, latitude, longitude, height, scale, and orientation control. The National Geodetic Survey original field survey project observations and final reports are accessioned into records system of the National Archives and Records Administration of the U.S.A. These surveys provide information valuable for a variety of uses in the mapping, charting and surveying community. The NGS' final product is the geodetic data sheet. Geodetic data sheets are comprehensive summaries of all published information for a given geodetic reference point, including: the geographic position and/or height based on the current reference datum, condition of the survey mark when it was last visited, a description of where the point is located and how to reach it, and an explanation of the terms used in the data sheet. In support of these geodetic data, the NGS provides software, publications, and various user services, including geodetic advisor program, instrument calibration, surveying standards, and technical workshops. This dataset contains certain information extracted from the above mentioned data sheet.



Process contact
Individual's name NGS Information Services Branch
Contact's position Information Specialist
Contact's role  processor


Contact information
Phone
Voice 301-713-3242
Fax 301-713-4172

Address
Type both
Delivery point SSMC3/9202 1315 East-west Highway
City Silver Spring
Administrative area MD
Postal code 20910
Country US
e-mail addressngs.infocenter@noaa.gov

Hours of service
9:00am to 4:30pm EST

Contact instructions
Prefer EMail



Source data
Relationship to the process step used


Source citation
Alternate titles  Geodetic Data






Source data
Relationship to the process step produced


Source citation
Alternate titles  NOAA, National Geodetic Survey and cooperating organizations.








Source data
Description
The geodetic data must be submitted in the digital formats specified in the FGCS (formally FGCC) publication "Input Formats and Specifications of the National Geodetic Survey Data Base" which describes the formats and procedures for submission of data for adjustment and assimilation into the National Geodetic Survey Data Base. Separate volumes of this publication refer to horizontal (volume 1), vertical (volume 2), and gravity (volume 3) control, and are available from NOAA, National Geodetic Survey, 1315 East-West Hwy, Code N/CGS1, Silver Spring, MD, 20910 (1-301-713-3242). Note guidelines for submission of three-dimensional Global Positioning System (GPS) relative positioning data are contained in annex L to volume 1.



Source medium name  hardcopy—printing on paper
Source citation
Title "Input Formats and Specifications of the National Geodetic Survey Data Base" published by FGCS (formally FGCC)
Alternate titles  Blue Book
Publication date 2020-05-10


Edition latest available


Presentation formats  hardcopy diagram
FGDC geospatial presentation format  diagram


Series
Name N/A
Issue N/A

Other citation details
N/A



Responsible party
Organization's name NOAA, National Geodetic Survey
Contact's role  publisher


Contact information
Address
Delivery point NOAA Campus, Silver Spring, MD



Responsible party
Organization's name NOAA, National Geodetic Survey
Contact's role  originator


Resource location online
Location <http://www.ngs.noaa.gov/FGCS/BlueBook/>



Extent of the source data
Description
publication date

Temporal extent
Date and time 1994-01-01



Geoprocessing history 

Process
Date 2020-06-23 10:43:40
Tool location c:\program files (x86)\arcgis\desktop10.6\ArcToolbox\Toolboxes\Conversion Tools.tbx\FeatureClassToFeatureClass
Command issued
FeatureClassToFeatureClass "\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp" "Database Connections\ASDI_Location_PROD.sde" GEODETIC_CONTROL_NGS_2020 # "FeatureId "FeatureId" true true false 4 Short 0 4 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,FeatureId,-1,-1;DATA_DATE "DATA_DATE" true true false 8 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DATA_DATE,-1,-1;DATA_SRCE "DATA_SRCE" true true false 57 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DATA_SRCE,-1,-1;PID "PID" true true false 6 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,PID,-1,-1;NAME "NAME" true true false 40 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,NAME,-1,-1;HT_MOD "HT_MOD" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,HT_MOD,-1,-1;CORS_ID "CORS_ID" true true false 4 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,CORS_ID,-1,-1;PACS_SACS "PACS_SACS" true true false 4 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,PACS_SACS,-1,-1;STATE "STATE" true true false 2 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,STATE,-1,-1;COUNTY "COUNTY" true true false 26 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,COUNTY,-1,-1;QUAD "QUAD" true true false 40 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,QUAD,-1,-1;LATITUDE "LATITUDE" true true false 17 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,LATITUDE,-1,-1;LONGITUDE "LONGITUDE" true true false 18 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,LONGITUDE,-1,-1;DEC_LAT "DEC_LAT" true true false 14 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DEC_LAT,-1,-1;DEC_LON "DEC_LON" true true false 15 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DEC_LON,-1,-1;ELLIP_HT "ELLIP_HT" true true false 10 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,ELLIP_HT,-1,-1;POS_DATUM "POS_DATUM" true true false 6 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,POS_DATUM,-1,-1;DATUM_TAG "DATUM_TAG" true true false 10 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DATUM_TAG,-1,-1;POS_EPOCH "POS_EPOCH" true true false 7 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,POS_EPOCH,-1,-1;POS_SRCE "POS_SRCE" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,POS_SRCE,-1,-1;ORTHO_HT "ORTHO_HT" true true false 9 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,ORTHO_HT,-1,-1;VERT_DATUM "VERT_DATUM" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,VERT_DATUM,-1,-1;VERT_EPOCH "VERT_EPOCH" true true false 7 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,VERT_EPOCH,-1,-1;VERT_SRCE "VERT_SRCE" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,VERT_SRCE,-1,-1;GEOID_HT "GEOID_HT" true true false 10 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,GEOID_HT,-1,-1;GEOID_MOD "GEOID_MOD" true true false 9 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,GEOID_MOD,-1,-1;DYNAMIC_HT "DYNAMIC_HT" true true false 14 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DYNAMIC_HT,-1,-1;MODEL_GRAV "MODEL_GRAV" true true false 14 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,MODEL_GRAV,-1,-1;N_ACC_HZ "N_ACC_HZ" true true false 6 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_HZ,-1,-1;N_ACC_EH "N_ACC_EH" true true false 6 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_EH,-1,-1;N_ACC_STDN "N_ACC_STDN" true true false 5 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_STDN,-1,-1;N_ACC_STDE "N_ACC_STDE" true true false 5 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_STDE,-1,-1;N_ACC_STDH "N_ACC_STDH" true true false 5 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_STDH,-1,-1;N_ACC_CORR "N_ACC_CORR" true true false 11 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,N_ACC_CORR,-1,-1;POS_ORDER "POS_ORDER" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,POS_ORDER,-1,-1;VERT_ORDER "VERT_ORDER" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,VERT_ORDER,-1,-1;VERT_CLASS "VERT_CLASS" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,VERT_CLASS,-1,-1;DIST_RATE "DIST_RATE" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,DIST_RATE,-1,-1;ECEF_X "ECEF_X" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,ECEF_X,-1,-1;ECEF_Y "ECEF_Y" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,ECEF_Y,-1,-1;ECEF_Z "ECEF_Z" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,ECEF_Z,-1,-1;SPC_ZONE "SPC_ZONE" true true false 8 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SPC_ZONE,-1,-1;SPC_NORTH "SPC_NORTH" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SPC_NORTH,-1,-1;SPC_EAST "SPC_EAST" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SPC_EAST,-1,-1;SPC_CONV "SPC_CONV" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SPC_CONV,-1,-1;SPC_CSF "SPC_CSF" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SPC_CSF,-1,-1;UTM_ZONE "UTM_ZONE" true true false 8 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,UTM_ZONE,-1,-1;UTM_NORTH "UTM_NORTH" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,UTM_NORTH,-1,-1;UTM_EAST "UTM_EAST" true true false 13 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,UTM_EAST,-1,-1;UTM_CONV "UTM_CONV" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,UTM_CONV,-1,-1;UTM_CSF "UTM_CSF" true true false 12 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,UTM_CSF,-1,-1;STABILITY "STABILITY" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,STABILITY,-1,-1;FIRST_RECV "FIRST_RECV" true true false 8 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,FIRST_RECV,-1,-1;LAST_RECV "LAST_RECV" true true false 8 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,LAST_RECV,-1,-1;LAST_COND "LAST_COND" true true false 16 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,LAST_COND,-1,-1;LAST_RECBY "LAST_RECBY" true true false 6 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,LAST_RECBY,-1,-1;SAT_USE "SAT_USE" true true false 1 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SAT_USE,-1,-1;MARKER "MARKER" true true false 57 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,MARKER,-1,-1;SETTING "SETTING" true true false 50 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,SETTING,-1,-1;STAMPING "STAMPING" true true false 50 Text 0 0 ,First,#,\\cm-sas-gis-01\Fileshare\Projects\PLSS\Control Points\NGS Geodetic Control\20200525\AR.shp,STAMPING,-1,-1" #
Include in lineage when exporting metadata No


Distribution 

Distributor
Contact information
Individual's name NGS Information Services Branch
Organization's name NOAA, National Geodetic Survey
Contact's position Information Specialist
Contact's role  distributor


Contact information
Phone
Voice 301-713-3242
Fax 301-713-4172

Address
Type both
Delivery point SSMC3/9202 1315 East-west Highway
City Silver Spring
Administrative area MD
Postal code 20910
Country US
e-mail addressngs.infocenter@noaa.gov

Hours of service
9:00am to 4:30pm EST

Contact instructions
Prefer EMail



Available format
Name ShapeFile
Version 1.0; 2013
File decompression technique Download options include PC Zip and Unix compressed tar


Ordering process
Terms and fees free if you retrieve it yourself

Transfer options
Online source
Location <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl?Explain=ShapeFiles>
Description  Distributed through http://www.ngs.noaa.gov/cgi-bin/datasheet.prl

Transfer options
Online source
Description  Datasheet Shapefile



Distribution format
*Name SDE Feature Class


Transfer options
Online source
Location <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>

Fields 

Details for object asdi.LOCATION.GEODETIC_CONTROL_NGS_2020 
*Type Feature Class
*Row count 11260


Field OBJECTID
 
*Alias OBJECTID
*Data type OID
*Width 4
*Precision 10
*Scale 0
*Field description
Internal feature number.

*Description source
Esri

*Description of values
Sequential unique whole numbers that are automatically generated.





Field FeatureId
 
*Alias FeatureId
*Data type SmallInteger
*Width 2
*Precision 5
*Scale 0




Field DATA_DATE
 
*Alias DATA_DATE
*Data type String
*Width 8
*Precision 0
*Scale 0




Field DATA_SRCE
 
*Alias DATA_SRCE
*Data type String
*Width 57
*Precision 0
*Scale 0




Field PID
 
*Alias PID
*Data type String
*Width 6
*Precision 0
*Scale 0




Field NAME
 
*Alias NAME
*Data type String
*Width 40
*Precision 0
*Scale 0




Field HT_MOD
 
*Alias HT_MOD
*Data type String
*Width 1
*Precision 0
*Scale 0




Field CORS_ID
 
*Alias CORS_ID
*Data type String
*Width 4
*Precision 0
*Scale 0




Field PACS_SACS
 
*Alias PACS_SACS
*Data type String
*Width 4
*Precision 0
*Scale 0




Field STATE
 
*Alias STATE
*Data type String
*Width 2
*Precision 0
*Scale 0




Field COUNTY
 
*Alias COUNTY
*Data type String
*Width 26
*Precision 0
*Scale 0




Field QUAD
 
*Alias QUAD
*Data type String
*Width 40
*Precision 0
*Scale 0




Field LATITUDE
 
*Alias LATITUDE
*Data type String
*Width 17
*Precision 0
*Scale 0




Field LONGITUDE
 
*Alias LONGITUDE
*Data type String
*Width 18
*Precision 0
*Scale 0




Field DEC_LAT
 
*Alias DEC_LAT
*Data type String
*Width 14
*Precision 0
*Scale 0




Field DEC_LON
 
*Alias DEC_LON
*Data type String
*Width 15
*Precision 0
*Scale 0




Field ELLIP_HT
 
*Alias ELLIP_HT
*Data type String
*Width 10
*Precision 0
*Scale 0




Field POS_DATUM
 
*Alias POS_DATUM
*Data type String
*Width 6
*Precision 0
*Scale 0




Field DATUM_TAG
 
*Alias DATUM_TAG
*Data type String
*Width 10
*Precision 0
*Scale 0




Field POS_EPOCH
 
*Alias POS_EPOCH
*Data type String
*Width 7
*Precision 0
*Scale 0




Field POS_SRCE
 
*Alias POS_SRCE
*Data type String
*Width 12
*Precision 0
*Scale 0




Field ORTHO_HT
 
*Alias ORTHO_HT
*Data type String
*Width 9
*Precision 0
*Scale 0




Field VERT_DATUM
 
*Alias VERT_DATUM
*Data type String
*Width 12
*Precision 0
*Scale 0




Field VERT_EPOCH
 
*Alias VERT_EPOCH
*Data type String
*Width 7
*Precision 0
*Scale 0




Field VERT_SRCE
 
*Alias VERT_SRCE
*Data type String
*Width 12
*Precision 0
*Scale 0




Field GEOID_HT
 
*Alias GEOID_HT
*Data type String
*Width 10
*Precision 0
*Scale 0




Field GEOID_MOD
 
*Alias GEOID_MOD
*Data type String
*Width 9
*Precision 0
*Scale 0




Field DYNAMIC_HT
 
*Alias DYNAMIC_HT
*Data type String
*Width 14
*Precision 0
*Scale 0




Field MODEL_GRAV
 
*Alias MODEL_GRAV
*Data type String
*Width 14
*Precision 0
*Scale 0




Field N_ACC_HZ
 
*Alias N_ACC_HZ
*Data type String
*Width 6
*Precision 0
*Scale 0




Field N_ACC_EH
 
*Alias N_ACC_EH
*Data type String
*Width 6
*Precision 0
*Scale 0




Field N_ACC_STDN
 
*Alias N_ACC_STDN
*Data type String
*Width 5
*Precision 0
*Scale 0




Field N_ACC_STDE
 
*Alias N_ACC_STDE
*Data type String
*Width 5
*Precision 0
*Scale 0




Field N_ACC_STDH
 
*Alias N_ACC_STDH
*Data type String
*Width 5
*Precision 0
*Scale 0




Field N_ACC_CORR
 
*Alias N_ACC_CORR
*Data type String
*Width 11
*Precision 0
*Scale 0




Field POS_ORDER
 
*Alias POS_ORDER
*Data type String
*Width 1
*Precision 0
*Scale 0




Field VERT_ORDER
 
*Alias VERT_ORDER
*Data type String
*Width 1
*Precision 0
*Scale 0




Field VERT_CLASS
 
*Alias VERT_CLASS
*Data type String
*Width 1
*Precision 0
*Scale 0




Field DIST_RATE
 
*Alias DIST_RATE
*Data type String
*Width 1
*Precision 0
*Scale 0




Field ECEF_X
 
*Alias ECEF_X
*Data type String
*Width 13
*Precision 0
*Scale 0




Field ECEF_Y
 
*Alias ECEF_Y
*Data type String
*Width 13
*Precision 0
*Scale 0




Field ECEF_Z
 
*Alias ECEF_Z
*Data type String
*Width 13
*Precision 0
*Scale 0




Field SPC_ZONE
 
*Alias SPC_ZONE
*Data type String
*Width 8
*Precision 0
*Scale 0




Field SPC_NORTH
 
*Alias SPC_NORTH
*Data type String
*Width 13
*Precision 0
*Scale 0




Field SPC_EAST
 
*Alias SPC_EAST
*Data type String
*Width 13
*Precision 0
*Scale 0




Field SPC_CONV
 
*Alias SPC_CONV
*Data type String
*Width 12
*Precision 0
*Scale 0




Field SPC_CSF
 
*Alias SPC_CSF
*Data type String
*Width 12
*Precision 0
*Scale 0




Field UTM_ZONE
 
*Alias UTM_ZONE
*Data type String
*Width 8
*Precision 0
*Scale 0




Field UTM_NORTH
 
*Alias UTM_NORTH
*Data type String
*Width 13
*Precision 0
*Scale 0




Field UTM_EAST
 
*Alias UTM_EAST
*Data type String
*Width 13
*Precision 0
*Scale 0




Field UTM_CONV
 
*Alias UTM_CONV
*Data type String
*Width 12
*Precision 0
*Scale 0




Field UTM_CSF
 
*Alias UTM_CSF
*Data type String
*Width 12
*Precision 0
*Scale 0




Field STABILITY
 
*Alias STABILITY
*Data type String
*Width 1
*Precision 0
*Scale 0




Field FIRST_RECV
 
*Alias FIRST_RECV
*Data type String
*Width 8
*Precision 0
*Scale 0




Field LAST_RECV
 
*Alias LAST_RECV
*Data type String
*Width 8
*Precision 0
*Scale 0




Field LAST_COND
 
*Alias LAST_COND
*Data type String
*Width 16
*Precision 0
*Scale 0




Field LAST_RECBY
 
*Alias LAST_RECBY
*Data type String
*Width 6
*Precision 0
*Scale 0




Field SAT_USE
 
*Alias SAT_USE
*Data type String
*Width 1
*Precision 0
*Scale 0




Field MARKER
 
*Alias MARKER
*Data type String
*Width 57
*Precision 0
*Scale 0




Field SETTING
 
*Alias SETTING
*Data type String
*Width 50
*Precision 0
*Scale 0




Field STAMPING
 
*Alias STAMPING
*Data type String
*Width 50
*Precision 0
*Scale 0




Field Shape
 
*Alias Shape
*Data type Geometry
*Width 4
*Precision 0
*Scale 0
*Field description
Feature geometry.

*Description source
Esri

*Description of values
Coordinates defining the features.







Overview Description
Entity and Attribute Overview

The current attributes and their meaning are shown below.

#FeatureId
Temporary unique ID assigned to this station.

DATA_DATE-
The date when this information was retrieved from the NGS database.

DATA_SRCE-
Data Source where the information for the mark came from.
You should use this link to obtain a full datasheet for the mark
or obtain the datasheets from http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
if you intend to use the data for survey control.

DEC_LONG-
Decimal equivalent of the LONGITUDE
Always displayed to 10 decimal places, but you should
see POS_SRCE and POS_ORDER to determine the true accuracy.

DEC_LAT-
Decimal equivalent of the LATITUDE

PID-
Permanent Identifier assigned by NGS to each mark

NAME-
Station Name (a.k.a. Designation)

STATE-
State Code

COUNTY-
County Name

QUAD-
USGS Topographic Quad Map Name

LATITUDE-
Latitude in Deg-Min-Sec format

LONGITUDE-
Longitude in Deg-Min-Sec format

POS_DATUM-
Datum of the LATITUDE,LONGITUDE
Should always be NAD83

DATUM_TAG-
Datum Tag of the LATITUDE,LONGITUDE
NAD83 (1986) indicates positions on the NAD83 datum for the
North American Adjustment, completed in 1986.
NAD83 (nnnn) indicates positions on the NAD83 datum for the
North American Adjustment, but readjusted to a State High
Accuracy Reference Network (HARN) on the date shown in (nnnn).
NAD83 (CORS) indicates positions which are part of the CORS
network.

POS_SRCE-
Position Source for the LATITUDE,LONGITUDE

ADJUSTED = Least squares adjustment.
(Lat,Lon Rounded to 5 decimal places.)

HD_HELD1 = Differentially corrected hand held GPS observations.
(Lat,Lon Rounded to 2 decimal places.)

HD_HELD2 = Autonomous hand held GPS observations.
(Lat,Lon Rounded to 1 decimal places.)

SCALED   = Scaled from a topographic map.
(Lat,Lon Rounded to 0 decimal places.)

ORTHO_HT-
Present if available.
The Orthometric Height in METERS indicating the height above the Geoid.

VERT_DATUM-
Datum of the ORTHO_HT

VERT_SRCE-
Vertical Source for the ORTHO_HT

ADJUSTED = Direct Digital Output from Least Squares Adjustment
of Precise Leveling.
(Rounded to 3 decimal places.)

ADJ UNCH = Manually Entered (and NOT verified) Output of
Least Squares Adjustment of Precise Leveling.
(Rounded to 3 decimal places.)

POSTED   = Pre-1991 Precise Leveling Adjusted to
the NAVD 88 Network After Completion of
the NAVD 88 General Adjustment of 1991.
(Rounded to 3 decimal places.)

READJUST = Precise Leveling Readjusted as Required
by Crustal Motion or Other Cause.
(Rounded to 2 decimal places.)

N HEIGHT = Computed from Precise Leveling Connected
at Only One Published Bench Mark.
(Rounded to 2 decimal places.)

RESET    = Reset Computation of Precise Leveling.
(Rounded to 2 decimal places.)

COMPUTED = Computed from Precise Leveling Using
Non-rigorous Adjustment Technique.
(Rounded to 2 decimal places.)

LEVELING = Precise Leveling Performed by Horizontal
Field Party.
(Rounded to 2 decimal places.)

H LEVEL  = Level between control points not connected
to bench mark.
(Rounded to 1 decimal places.)

GPS OBS  = Computed from GPS Observations.
(Rounded to 1 decimal places.)

VERT ANG = Computed from Vertical Angle Observations.
(Rounded to 1 decimal place;
If No Check, to 0 decimal places.)

SCALED   = Scaled from a Topographic Map.
(Rounded to 0 decimal places.)

U HEIGHT = Unvalidated height from precise leveling
connected at only one NSRS point.
(Rounded to 2 decimal places.)

VERTCON  = The NAVD 88 height was computed by applying the
VERTCON shift value to the NGVD 29 height.
(Rounded to 0 decimal places.)

ELLIP_HT-
Present if available.
The ellipsoid height in METERS referenced to GRS80 ellipsoid.

POS_ORDER-
Order of accuracy for the LATITUDE,LONGITUDE
Should be one of the following-
A,B,1,2,3

Order and class for Orders 1, 2, and 3
are defined in the Federal Geodetic Control Committee publication
"Standards and Specifications for Geodetic Control Networks".

In addition-
Order A stations have a relative accuracy of
5 mm +/- 1-10,000,000 relative to other A-order stations.

Order B stations have a relative accuracy of
8 mm +/- 1- 1,000,000 relative to other A- and B-order stations.

VERT_ORDER-
Order of accuracy for the ORTHO_HT
Should be 1,2, or 3 for Vertical Control Stations.
Will be blank for stations used for Horizontal Control only.

Also see attribute DIST_RATE which is used for some
vertical control stations.

Vertical order and class for 1, 2, and 3
are defined in the Federal Geodetic Control
Committee publication "Standards and Specifications for Geodetic
Control Networks".  In addition-

Vertical control which were determined only for the purpose of
supplying a height for Horizontal Distance Reductions are
assigned an order of 3.

Class 0 is used for special cases of
orthometric vertical control as follows-

Vertical Order/Class               Tolerance Factor
--------------------               ----------------
1    class 0                   2.0 mm or less
2    class 0                   8.4 mm or less
3    class 0                  12.0 mm or less

VERT_CLASS-
Should be 0, 1, or 2
See details under ELEV_ORDER

DIST_RATE-
Distribution rate for POSTED and READJUSTED benchmarks
which do not have an Order and Class are as follows
"Posted bench marks" are vertical control points in the NGS data
base which were excluded from the NAVD 88 general adjustment.
Some of the bench marks were excluded due to large adjustment
residuals, possibly caused by vertical movement of the bench marks
during the time interval between different leveling epochs.
Adjusted NAVD 88 are computed for posted bench marks by
supplemental adjustments.

A range of mean distribution rate corrections is listed for each
posted bench mark in the data portion of the publication.
A summary table of the mean distribution rates and their codes is
listed below.  The mean distribution rate corrections which were
applied to the original leveling observations is a good
indication of the usefulness of the posted bench marks' adjusted
NAVD 88 heights.

Distribution                     Distribution
Rate Code                      Rate Correction
------------                    ---------------
"a"                        0.0 thru 1.0 mm/km
"b"                        1.1 thru 2.0   "
"c"                        2.1 thru 3.0   "
"d"                        3.1 thru 4.0   "
"e"                        4.1 thru 8.0   "
"f"                        greater than 8.0 mm/km

POSTED BENCH MARKS SHOULD BE USED WITH CAUTION.  As is the case for
all leveling projects, the mandatory FGCS check leveling two-mark or
three-mark tie procedure will usually detect any isolated movement
(or other problem) at an individual bench mark.  Of course, regional
movement affecting all the marks equally is not detected by the two-
or three-mark tie procedure.

FIRST_RECV-
Date when the station was first monumented
or in the case of landmarks, first observed.

LAST_RECV-
Date when the station was last recovered.

LAST_COND-
Last recovered condition of the mark.
Should be one of the following-
MONUMENTED
FIRST OBSERVED
GOOD
POOR
MARK NOT FOUND
SEE DESCRIPTION
DESTROYED

LAST_RECBY-
Agency who reported the last condition of the mark.

STABILITY-
The stability of the mark may have 1 of 4 codes as indicated below-
A = MOST RELIABLE AND EXPECTED TO HOLD POSITION/ELEVATION WELL
B = PROBABLY HOLD POSITION/ELEVATION WELL
C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO SURFACE MOTION
- E.G. FROST HEAVE, ETC
D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY

HT_MOD-
Designates if this site is a Height Modernization site. Y - Yes.

CORS_ID-
Continuously Operating Reference Stations (CORS) site ID.

PACS_SACS-
Designates whether this is a Primary Airport Control
Station (PACS) or Secondary Airport Control Station (SACS).

GEOID_HT-
Present if available.  The geoid height in METERS referenced
to the geoid model attribute.

N_ACC_HZ-
Horizontal network accuracy at the 95 percent confidence level (cm).

N_ACC_EL-
Ellipsoid height network accuracy at the 95 percent confidence level (cm).

N_ACC_STD_N-
North component of coordinate standard deviation (latitude), used to compute horizontal network accuracy (cm).

N_ACC_STD_E-
East component of coordinate standard deviation (longitude), used to compute horizontal network accuracy (cm).

N_ACC_STD_H-
Up component of coordinate standard deviation (ellipsoid height), used to compute ellipsoid height network accuracy (cm).

N_ACC_CORR-
Correlation coefficient between north and east components of coordinate standard deviation (latitude and longitude), used to compute horizontal network accuracy (unitless).

ECEF_X-
The computed Earth-Centered, Earth-Fixed X position.

ECEF_Y-
The computed Earth-Centered, Earth-Fixed Y position.

ECEF_Z-
The computed Earth-Centered, Earth-Fixed Z position.

SPC_ZONE-
The State Plane Coordinate Zone.

SPC_NORTH-
The State Plane Coordinate Northing.

SPC_EAST-
The State Plane Coordinate Easting.

SPC_CONV-
The State Plane Coordinate Convergence Angle.

SPC_CSF-
The State Plane Coordinate Combined Scale Factor.

UTM_ZONE-
The Universal Transverse Mercator Zone.

UTM_NORTH-
The Universal Transverse Mercator Northing.

UTM_EAST-
The Universal Transverse Mercator Easting.

UTM_CONV-
The Universal Transverse Mercator Convergence Angle.

UTM_CSF-
The Universal Transverse Mercator Combined Scale Factor.

DYNAMIC_HT-
The computed dynamic height at a bench mark using the
orthometric height referenced the NAVD 88 and a gravity value.

MODELEDGRAV-
The interpolated gravity value which was used in the
NAVD 88 general adjustment.

MARKER-
Identifies the type of marker.

SETTING-
Identifies the type of setting.

STAMPING-
Identifies the stamping on the disk.



Entity and Attribute Detail Citation
All values were obtained from the NGA Datasheet
available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>





Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2020-06-23


ArcGIS metadata properties
Metadata format ArcGIS 1.0


Last modified in ArcGIS for the item 2020-06-23 11:23:27


Automatic updates
Last update 2020-06-23 11:23:27


Metadata Contacts 

Metadata contact
Individual's name NGS Information Services Branch
Organization's name NOAA, National Geodetic Survey
Contact's position Information Specialist
Contact's role  point of contact


Contact information
Phone
Voice 301-713-3242
Fax 301-713-4172

Address
Type both
Delivery point SSMC3/9202 1315 East-west Highway
City Silver Spring
Administrative area MD
Postal code 20910
Country US
e-mail addressngs.software@noaa.gov

Hours of service
9:00am to 4:30pm EST

Contact instructions
Prefer EMail



Metadata Constraints 

Legal constraints
Access constraints  other restrictions


Other constraints
Geodetic Data are in the public domain, not restricted from access or distribution.

Security constraints
Classification  unclassified
Classification system DOD


Additional restrictions
none



Constraints
Limitations of use
not restricted; Geodetic Data, including software were developed and compiled with U.S. Government funding; no proprietary rights may be attached to them nor may they be sold to the U.S. Government as part of any procurement of ADP products or services.

Thumbnail and Enclosures 

Enclosure
Enclosure type  File
Description of enclosure original metadata
Original metadata document, which was translated yes
Source metadata format fgdc

FGDC Metadata (read-only) 

Identification 

Citation
Citation Information
OriginatorNOAA, National Geodetic Survey
Publication Date2020-05-10
Title
Horizontal and Vertical Geodetic Control Data for the Unites States.
Editionlatest available
Geospatial Data Presentation FormDiagram
Series Information
Series NameN/A
Issue IdentificationN/A
Publication Information
Publication PlaceNOAA Campus, Silver Spring, MD
PublisherNOAA, National Geodetic Survey
Other Citation Details
Questions concerning this data may be addressed to NGS Information Services Branch EMail - ngs.software@noaa.gov Phone - 301-713-3242
Online Linkage<http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>

Description
Abstract
                            
This data contains a set of geodetic control stations
maintained by the National Geodetic Survey.
Each geodetic control station in this dataset
has either a precise Latitude/Longitude used
for horizontal control or a precise Orthometric Height
used for vertical control, or both.

The National Geodetic Survey (NGS) serves
as the Nation's depository for geodetic data. The NGS
distributes geodetic data worldwide to a variety of
users. These geodetic data include the final results
of geodetic surveys, software programs to format,
compute, verify, and adjust original survey
observations or to convert values from one geodetic
datum to another, and publications that describe how to
obtain and use Geodetic Data products and services.

                          
Purpose
                            
Provide a base of reference for latitude, longitude and height
throughout the United States.

                          
Time Period of Content
Time Period Information
Single Date/Time
Calendar Date2020-05-10
Currentness Reference
                            retrieval date
                          
Status
ProgressComplete
Maintenance and Update FrequencyContinually

Spatial Domain
Bounding Coordinates
West Bounding Coordinate-94.6
East Bounding Coordinate-89.7
North Bounding Coordinate36.5
South Bounding Coordinate33.0

Keywords
Theme
Theme Keyword Thesaurusgeodesy
Theme Keyword NSRS, geodetic, horizontal control, vertical control, ellipsoid height, benchmark, orthometric height, latitude, longitude

Place
Place Keyword ThesaurusNone
Place KeywordThe geographic limits of USA including trust Territories

Stratum
Stratum Keyword ThesaurusN/A
Stratum KeywordN/A

Temporal
Temporal Keyword ThesaurusN/A
Temporal KeywordN/A

Access Constraints
                        
Geodetic Data are in the public
domain, not restricted from access or distribution.

                      
Use Constraints
                        
Not restricted; Geodetic Data,
including software were developed and compiled with
U.S. Government funding; no proprietary rights may be
attached to them nor may they be sold to the U.S.
Government as part of any procurement of ADP products
or services.

                      
Point of Contact
Contact Information
Contact Person Primary
Contact PersonNGS Information Services Branch
Contact OrganizationNOAA, National Geodetic Survey
Contact PositionInformation Specialist
Contact Address
Address TypeMailing and Physical Address
Address SSMC3/9202 1315 East-west Highway
CitySilver Spring
State or ProvinceMD
Postal Code20910
CountryUNITED STATES

Contact Voice Telephone301-713-3242
Contact Facsimile Telephone301-713-4172
Contact Electronic Mail Addressngs.infocenter@noaa.gov
Hours of Service7:00am to 4:30pm EST
Contact Instructions
                                Prefer EMail
                              

Data Set Credit
                        
NOAA, National Geodetic Survey and
cooperating organizations

                      
Security Information
Security Classification SystemDOD
Security Classificationunclassified
Security Handling Descriptionnone

Native Data Set Environment
The data was extracted from NGS datasheets which are available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl> The NGS datasheet is a text document which summarizes key geodetic information stored in the NGS database.

Data Quality 

Attribute Accuracy
Attribute Accuracy Report
                            
Horizontal control stations (those with precise Latitude, Longitude)
were established in accordance with FGDC publications
"Standards and Specifications for Geodetic Accuracy Standards"
and "Geometric Geodetic Accuracy Standards and Specifications for
Using GPS Relative Positioning Techniques"
The final Latitude, Longitude of these stations were determined
by a least squares adjustments of the horizontal observations.
Horizontal control station have Latitude, Longitudes displayed
to 5 places and are identified by attribute POS_SRCE = 'ADJUSTED'

Lesser quality Latitude, Longitudes may also be preset in the dataset.
These are identified by a POS_SRCE attributes
HD_HELD1, HD_HELD2, or SCALED.
These lesser quality positions are described at:
<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>

Vertical control stations (those with precise Orthometric Heights)
were established in accordance with FGDC publications
"Standards and Specifications for Geodetic Accuracy Standards"
The final Orthometric Height of these stations were in most cases
determined by a least squares adjustments of the vertical observations
but in some cases may have been keyed from old survey documents.
Vertical control stations have Orthometric Heights displayed
to 2 or 3 places and are identified by attribute ELEV_SRCE of
ADJUSTED, ADJ UNCH, POSTED,READJUST,N HEIGHT,RESET,COMPUTED

Lesser quality Orthometric Heights may also be preset in the dataset.
These are identified by a ELEV_SRCE attributes
GPS_OBS, VERT_ANG, H_LEVEL, VERTCON, SCALED.
These lesser quality orthometric heights are described at:
<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>

IMPORTANT - Control stations do not always have both precise
Latitude, Longitude AND precise Orthometric Height.
A horizontal control station may have a orthometric
height associated with it which is of non geodetic quality.
These types of heights are displayed to 0, 1, or 2 decimal
places.  Worst case being off by +/- 1 meter.
LIKEWISE - A Vertical control station may have a Latitude, Longitude
associated with it which is of non geodetic quality.
These types of Latitude, Longitudes are displayed to 0, 1 or 2 decimal
places.  Worst case being off by +/- 180 meter.
Refer to <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>
for a description of the various type of methods used in determining
the Latitude, Longitude, and Orthometric Height.

Attribute POS_CHECK and ELEV_CHECK indicate whether or not
an observational check was made to the position and/or orthometric height.
Care should be taken when using "No Check" coordinates.

If attribute ELEV_SRCE = 'VERTCON' then the Orthometric Height was
determined by applying NGS program VERTCON to an Old NGVD 29 height.
In most areas VERTCON gives results to +/- 2 cm.
See <http://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html> for a more
detailed explanation of VERTCON accuracy.

Ellipsoid Heights are also present in the dataset.
The ellipsoid heights consist of those determined using a precise
geoid model, which are displayed to 2 decimal places and are considered
good to +/- .005 meters, and those displayed to 1 decimal place and are considered
only good to +/- .5 meters

                          
Quantitative Attribute Accuracy Assessment
Attribute Accuracy Value95 percent confidence level for geodetic quality data.
Attribute Accuracy Explanation
                                
Geodetic Data are continuously being processed;
their standards and specifications are being reviewed for next
publication release. "Standards and Specifications for Geodetic Control Networks",
1984 and "Geometric Geodetic Accuracy Standards
and Specifications for Using GPS Relative
Positioning Techniques," FGCS (formally FGCC)
publication version 5.0 1989, are most current
published documents.

                              
Logical Consistency Report
                        
FGCS sponsored testing in cooperation with equipment
manufacturers and National Institutes of Standards
and Technology, Gaithersburg, MD 20850

                      
Completeness Report
                        
This dataset DOES NOT include destroyed marks.
All other non-publishable marks are NOT included.
Non-publishable criteria is available at
<http://www.ngs.noaa.gov/cgi-bin/craigs_lib.prl?HELP_NONPUB=1>

                      
Positional Accuracy
Horizontal Positional Accuracy
Horizontal Positional Accuracy Report
                                
The description of tests are explained in "Geometric
Geodetic Accuracy Standards and Specifications For
Using GPS Relative Positioning Techniques," FGCS
(formally FGCC) publication version 5.0, 1989.

                              
Quantitative Horizontal Positional Accuracy Assessment
Horizontal Positional Accuracy Value.05 meters for highest order of accuracy
Horizontal Positional Accuracy Explanation
                                    
Horizontal positional accuracy statements pertain
to horizontal control stations only.
i.e. Those with geodetic quality Latitude, Longitudes.
Positional Accuracy explanation contained in
"Geometric Geodetic Accuracy Standards and
Specifications For Using GPS Relative Positioning
Techniques," FGCS (formally FGCC) publication
version 5.0, 1989, (See table 1, p6).
with the exception of Order A and Order B which
have an accuracy of as described at:
<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=HORZ%20ORDER>

                                  
Vertical Positional Accuracy
Vertical Positional Accuracy Report
                                
The description of tests are explained in "Geometric Geodetic
Accuracy Standards and Specifications for Using
GPS Relative Positioning Techniques," FGCS
(formally FGCC) publication version 5.0, 1989,
(See table 1, p6).

                              
Quantitative Vertical Positional Accuracy Assessment
Vertical Positional Accuracy Value.05 meter for highest order of accuracy
Vertical Positional Accuracy Explanation
                                    
Vertical positional accuracy statements pertain
to vertical control stations only.
i.e. Those with geodetic quality Orthometric Heights.
Orthometric Height accuracy explanation is contained in
FGDC publication "Standards and Specifications for Geodetic Control Networks"
with the exception of vertical control of class 0
POSTED and READJUSTED Heights which are described at:
<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=VERT%20ORDER>

Ellipsoid height accuracy explanation contained in
"Geometric Geodetic Accuracy Standards and
Specifications for Using GPS Relative Positioning
Techniques," FGCS (formally FGCC) publication
version 5.0, 1989. (see table 1, p6).
The accuracies for ellipsoid heights are described at:
<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=ELLP%20ORDER>

                                  
Lineage
Source Information
Source Citation
Citation Information
OriginatorNOAA, National Geodetic Survey
Publication Date2020-05-10
Title
"Input Formats and Specifications of the National Geodetic Survey Data Base" published by FGCS (formally FGCC)
Editionlatest available
Geospatial Data Presentation Formdiagram
Series Information
Series NameN/A
Issue IdentificationN/A
Publication Information
Publication PlaceNOAA Campus, Silver Spring, MD
PublisherNOAA, National Geodetic Survey
Other Citation Details
N/A
Online Linkage<http://www.ngs.noaa.gov/FGCS/BlueBook/>

Type of Source Mediapaper, Web
Source Time Period of Content
Time Period Information
Single Date/Time
Calendar Date1994
Source Currentness Reference
publication date
Source Citation Abbreviation
Blue Book
Source Contribution
                                
The geodetic data must be
submitted in the digital formats specified in the
FGCS (formally FGCC) publication "Input Formats
and Specifications of the National Geodetic Survey
Data Base" which describes the formats and
procedures for submission of data for adjustment
and assimilation into the National Geodetic Survey
Data Base. Separate volumes of this publication
refer to horizontal (volume 1), vertical (volume
2), and gravity (volume 3) control, and are
available from NOAA, National Geodetic Survey,
1315 East-West Hwy, Code N/CGS1, Silver Spring,
MD, 20910 (1-301-713-3242). Note guidelines for
submission of three-dimensional Global Positioning
System (GPS) relative positioning data are
contained in annex L to volume 1.

                              
Process Step
Process Description
                                
The National Geodetic Survey
produces geodetic data. Geodetic data comprise
the results of geodetic surveys to determine,
among other things, latitude, longitude, height,
scale, and orientation control. The National
Geodetic Survey original field survey project
observations and final reports are accessioned
into records system of the National Archives and
Records Administration of the U.S.A. These
surveys provide information valuable for a variety
of uses in the mapping, charting and surveying
community.

The NGS' final product is the geodetic data sheet.
Geodetic data sheets are comprehensive summaries
of all published information for a given
geodetic reference point, including:
the geographic position and/or height based on the
current reference datum, condition of the survey
mark when it was last visited, a description of
where the point is located and how to reach it,
and an explanation of the terms used in the data
sheet. In support of these geodetic data, the NGS
provides software, publications, and various user
services, including geodetic advisor program,
instrument calibration, surveying standards, and
technical workshops.

This dataset contains certain information extracted
from the above mentioned data sheet.

                              
Source Used Citation Abbreviation
Geodetic Data
Process DateNot complete
Source Produced Citation Abbreviation
NOAA, National Geodetic Survey and cooperating organizations.


Process Contact
Contact Information
Contact Person Primary
Contact PersonNGS Information Services Branch
Contact PositionInformation Specialist
Contact Address
Address TypeMailing and Physical Address
Address SSMC3/9202 1315 East-west Highway
CitySilver Spring
State or ProvinceMD
Postal Code20910
CountryUNITED STATES

Contact Voice Telephone301-713-3242
Contact Facsimile Telephone301-713-4172
Contact Electronic Mail Addressngs.infocenter@noaa.gov
Hours of Service9:00am to 4:30pm EST
Contact Instructions
                                        Prefer EMail
                                      

Spatial Reference 

Horizontal Coordinate System Definition
Geographic
Latitude Resolution0.00001
Longitude Resolution0.00001
Geographic Coordinate Unitsdegrees, minutes, and decimal seconds

Geodetic Model
Horizontal Datum NameNorth American Datum of 1983 (NAD 83)
Ellipsoid NameGeodetic Reference System 80 (GRS80)
Semi-major Axis6378137
Denominator of Flattening Ratio298.26

Vertical Coordinate System Definition
Altitude System Definition
Altitude Datum Name North American Vertical Datum of 1988 (NAVD 88), including Ellipsoidal and Orthometric Heights.
Altitude Resolution.01
Altitude Distance Unitsmeters
Altitude Encoding Methodimplicit coordinate
Depth System Definition
Depth Datum Namethe local surface
Depth Resolution.01
Depth Distance Unitsmeters
Depth Encoding Methodimplicit coordinate

Entities and Attributes 

Detailed Description
Entity Type
Entity Type Labelasdi.LOCATION.GEODETIC_CONTROL_NGS_2020

Attribute
Attribute LabelOBJECTID
Attribute Definition
Internal feature number.
Attribute Definition SourceEsri
Attribute Domain Values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute LabelFeatureId

Attribute
Attribute LabelDATA_DATE

Attribute
Attribute LabelDATA_SRCE

Attribute
Attribute LabelPID

Attribute
Attribute LabelNAME

Attribute
Attribute LabelHT_MOD

Attribute
Attribute LabelCORS_ID

Attribute
Attribute LabelPACS_SACS

Attribute
Attribute LabelSTATE

Attribute
Attribute LabelCOUNTY

Attribute
Attribute LabelQUAD

Attribute
Attribute LabelLATITUDE

Attribute
Attribute LabelLONGITUDE

Attribute
Attribute LabelDEC_LAT

Attribute
Attribute LabelDEC_LON

Attribute
Attribute LabelELLIP_HT

Attribute
Attribute LabelPOS_DATUM

Attribute
Attribute LabelDATUM_TAG

Attribute
Attribute LabelPOS_EPOCH

Attribute
Attribute LabelPOS_SRCE

Attribute
Attribute LabelORTHO_HT

Attribute
Attribute LabelVERT_DATUM

Attribute
Attribute LabelVERT_EPOCH

Attribute
Attribute LabelVERT_SRCE

Attribute
Attribute LabelGEOID_HT

Attribute
Attribute LabelGEOID_MOD

Attribute
Attribute LabelDYNAMIC_HT

Attribute
Attribute LabelMODEL_GRAV

Attribute
Attribute LabelN_ACC_HZ

Attribute
Attribute LabelN_ACC_EH

Attribute
Attribute LabelN_ACC_STDN

Attribute
Attribute LabelN_ACC_STDE

Attribute
Attribute LabelN_ACC_STDH

Attribute
Attribute LabelN_ACC_CORR

Attribute
Attribute LabelPOS_ORDER

Attribute
Attribute LabelVERT_ORDER

Attribute
Attribute LabelVERT_CLASS

Attribute
Attribute LabelDIST_RATE

Attribute
Attribute LabelECEF_X

Attribute
Attribute LabelECEF_Y

Attribute
Attribute LabelECEF_Z

Attribute
Attribute LabelSPC_ZONE

Attribute
Attribute LabelSPC_NORTH

Attribute
Attribute LabelSPC_EAST

Attribute
Attribute LabelSPC_CONV

Attribute
Attribute LabelSPC_CSF

Attribute
Attribute LabelUTM_ZONE

Attribute
Attribute LabelUTM_NORTH

Attribute
Attribute LabelUTM_EAST

Attribute
Attribute LabelUTM_CONV

Attribute
Attribute LabelUTM_CSF

Attribute
Attribute LabelSTABILITY

Attribute
Attribute LabelFIRST_RECV

Attribute
Attribute LabelLAST_RECV

Attribute
Attribute LabelLAST_COND

Attribute
Attribute LabelLAST_RECBY

Attribute
Attribute LabelSAT_USE

Attribute
Attribute LabelMARKER

Attribute
Attribute LabelSETTING

Attribute
Attribute LabelSTAMPING

Attribute
Attribute LabelShape
Attribute Definition
Feature geometry.
Attribute Definition SourceEsri
Attribute Domain Values
Unrepresentable Domain
Coordinates defining the features.

Overview Description
Entity and Attribute Overview
                            

The current attributes and their meaning are shown below.

#FeatureId
Temporary unique ID assigned to this station.

DATA_DATE-
The date when this information was retrieved from the NGS database.

DATA_SRCE-
Data Source where the information for the mark came from.
You should use this link to obtain a full datasheet for the mark
or obtain the datasheets from http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
if you intend to use the data for survey control.

DEC_LONG-
Decimal equivalent of the LONGITUDE
Always displayed to 10 decimal places, but you should
see POS_SRCE and POS_ORDER to determine the true accuracy.

DEC_LAT-
Decimal equivalent of the LATITUDE

PID-
Permanent Identifier assigned by NGS to each mark

NAME-
Station Name (a.k.a. Designation)

STATE-
State Code

COUNTY-
County Name

QUAD-
USGS Topographic Quad Map Name

LATITUDE-
Latitude in Deg-Min-Sec format

LONGITUDE-
Longitude in Deg-Min-Sec format

POS_DATUM-
Datum of the LATITUDE,LONGITUDE
Should always be NAD83

DATUM_TAG-
Datum Tag of the LATITUDE,LONGITUDE
NAD83 (1986) indicates positions on the NAD83 datum for the
North American Adjustment, completed in 1986.
NAD83 (nnnn) indicates positions on the NAD83 datum for the
North American Adjustment, but readjusted to a State High
Accuracy Reference Network (HARN) on the date shown in (nnnn).
NAD83 (CORS) indicates positions which are part of the CORS
network.

POS_SRCE-
Position Source for the LATITUDE,LONGITUDE

ADJUSTED = Least squares adjustment.
(Lat,Lon Rounded to 5 decimal places.)

HD_HELD1 = Differentially corrected hand held GPS observations.
(Lat,Lon Rounded to 2 decimal places.)

HD_HELD2 = Autonomous hand held GPS observations.
(Lat,Lon Rounded to 1 decimal places.)

SCALED   = Scaled from a topographic map.
(Lat,Lon Rounded to 0 decimal places.)

ORTHO_HT-
Present if available.
The Orthometric Height in METERS indicating the height above the Geoid.

VERT_DATUM-
Datum of the ORTHO_HT

VERT_SRCE-
Vertical Source for the ORTHO_HT

ADJUSTED = Direct Digital Output from Least Squares Adjustment
of Precise Leveling.
(Rounded to 3 decimal places.)

ADJ UNCH = Manually Entered (and NOT verified) Output of
Least Squares Adjustment of Precise Leveling.
(Rounded to 3 decimal places.)

POSTED   = Pre-1991 Precise Leveling Adjusted to
the NAVD 88 Network After Completion of
the NAVD 88 General Adjustment of 1991.
(Rounded to 3 decimal places.)

READJUST = Precise Leveling Readjusted as Required
by Crustal Motion or Other Cause.
(Rounded to 2 decimal places.)

N HEIGHT = Computed from Precise Leveling Connected
at Only One Published Bench Mark.
(Rounded to 2 decimal places.)

RESET    = Reset Computation of Precise Leveling.
(Rounded to 2 decimal places.)

COMPUTED = Computed from Precise Leveling Using
Non-rigorous Adjustment Technique.
(Rounded to 2 decimal places.)

LEVELING = Precise Leveling Performed by Horizontal
Field Party.
(Rounded to 2 decimal places.)

H LEVEL  = Level between control points not connected
to bench mark.
(Rounded to 1 decimal places.)

GPS OBS  = Computed from GPS Observations.
(Rounded to 1 decimal places.)

VERT ANG = Computed from Vertical Angle Observations.
(Rounded to 1 decimal place;
If No Check, to 0 decimal places.)

SCALED   = Scaled from a Topographic Map.
(Rounded to 0 decimal places.)

U HEIGHT = Unvalidated height from precise leveling
connected at only one NSRS point.
(Rounded to 2 decimal places.)

VERTCON  = The NAVD 88 height was computed by applying the
VERTCON shift value to the NGVD 29 height.
(Rounded to 0 decimal places.)

ELLIP_HT-
Present if available.
The ellipsoid height in METERS referenced to GRS80 ellipsoid.

POS_ORDER-
Order of accuracy for the LATITUDE,LONGITUDE
Should be one of the following-
A,B,1,2,3

Order and class for Orders 1, 2, and 3
are defined in the Federal Geodetic Control Committee publication
"Standards and Specifications for Geodetic Control Networks".

In addition-
Order A stations have a relative accuracy of
5 mm +/- 1-10,000,000 relative to other A-order stations.

Order B stations have a relative accuracy of
8 mm +/- 1- 1,000,000 relative to other A- and B-order stations.

VERT_ORDER-
Order of accuracy for the ORTHO_HT
Should be 1,2, or 3 for Vertical Control Stations.
Will be blank for stations used for Horizontal Control only.

Also see attribute DIST_RATE which is used for some
vertical control stations.

Vertical order and class for 1, 2, and 3
are defined in the Federal Geodetic Control
Committee publication "Standards and Specifications for Geodetic
Control Networks".  In addition-

Vertical control which were determined only for the purpose of
supplying a height for Horizontal Distance Reductions are
assigned an order of 3.

Class 0 is used for special cases of
orthometric vertical control as follows-

Vertical Order/Class               Tolerance Factor
--------------------               ----------------
1    class 0                   2.0 mm or less
2    class 0                   8.4 mm or less
3    class 0                  12.0 mm or less

VERT_CLASS-
Should be 0, 1, or 2
See details under ELEV_ORDER

DIST_RATE-
Distribution rate for POSTED and READJUSTED benchmarks
which do not have an Order and Class are as follows
"Posted bench marks" are vertical control points in the NGS data
base which were excluded from the NAVD 88 general adjustment.
Some of the bench marks were excluded due to large adjustment
residuals, possibly caused by vertical movement of the bench marks
during the time interval between different leveling epochs.
Adjusted NAVD 88 are computed for posted bench marks by
supplemental adjustments.

A range of mean distribution rate corrections is listed for each
posted bench mark in the data portion of the publication.
A summary table of the mean distribution rates and their codes is
listed below.  The mean distribution rate corrections which were
applied to the original leveling observations is a good
indication of the usefulness of the posted bench marks' adjusted
NAVD 88 heights.

Distribution                     Distribution
Rate Code                      Rate Correction
------------                    ---------------
"a"                        0.0 thru 1.0 mm/km
"b"                        1.1 thru 2.0   "
"c"                        2.1 thru 3.0   "
"d"                        3.1 thru 4.0   "
"e"                        4.1 thru 8.0   "
"f"                        greater than 8.0 mm/km

POSTED BENCH MARKS SHOULD BE USED WITH CAUTION.  As is the case for
all leveling projects, the mandatory FGCS check leveling two-mark or
three-mark tie procedure will usually detect any isolated movement
(or other problem) at an individual bench mark.  Of course, regional
movement affecting all the marks equally is not detected by the two-
or three-mark tie procedure.

FIRST_RECV-
Date when the station was first monumented
or in the case of landmarks, first observed.

LAST_RECV-
Date when the station was last recovered.

LAST_COND-
Last recovered condition of the mark.
Should be one of the following-
MONUMENTED
FIRST OBSERVED
GOOD
POOR
MARK NOT FOUND
SEE DESCRIPTION
DESTROYED

LAST_RECBY-
Agency who reported the last condition of the mark.

STABILITY-
The stability of the mark may have 1 of 4 codes as indicated below-
A = MOST RELIABLE AND EXPECTED TO HOLD POSITION/ELEVATION WELL
B = PROBABLY HOLD POSITION/ELEVATION WELL
C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO SURFACE MOTION
- E.G. FROST HEAVE, ETC
D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY

HT_MOD-
Designates if this site is a Height Modernization site. Y - Yes.

CORS_ID-
Continuously Operating Reference Stations (CORS) site ID.

PACS_SACS-
Designates whether this is a Primary Airport Control
Station (PACS) or Secondary Airport Control Station (SACS).

GEOID_HT-
Present if available.  The geoid height in METERS referenced
to the geoid model attribute.

N_ACC_HZ-
Horizontal network accuracy at the 95 percent confidence level (cm).

N_ACC_EL-
Ellipsoid height network accuracy at the 95 percent confidence level (cm).

N_ACC_STD_N-
North component of coordinate standard deviation (latitude), used to compute horizontal network accuracy (cm).

N_ACC_STD_E-
East component of coordinate standard deviation (longitude), used to compute horizontal network accuracy (cm).

N_ACC_STD_H-
Up component of coordinate standard deviation (ellipsoid height), used to compute ellipsoid height network accuracy (cm).

N_ACC_CORR-
Correlation coefficient between north and east components of coordinate standard deviation (latitude and longitude), used to compute horizontal network accuracy (unitless).

ECEF_X-
The computed Earth-Centered, Earth-Fixed X position.

ECEF_Y-
The computed Earth-Centered, Earth-Fixed Y position.

ECEF_Z-
The computed Earth-Centered, Earth-Fixed Z position.

SPC_ZONE-
The State Plane Coordinate Zone.

SPC_NORTH-
The State Plane Coordinate Northing.

SPC_EAST-
The State Plane Coordinate Easting.

SPC_CONV-
The State Plane Coordinate Convergence Angle.

SPC_CSF-
The State Plane Coordinate Combined Scale Factor.

UTM_ZONE-
The Universal Transverse Mercator Zone.

UTM_NORTH-
The Universal Transverse Mercator Northing.

UTM_EAST-
The Universal Transverse Mercator Easting.

UTM_CONV-
The Universal Transverse Mercator Convergence Angle.

UTM_CSF-
The Universal Transverse Mercator Combined Scale Factor.

DYNAMIC_HT-
The computed dynamic height at a bench mark using the
orthometric height referenced the NAVD 88 and a gravity value.

MODELEDGRAV-
The interpolated gravity value which was used in the
NAVD 88 general adjustment.

MARKER-
Identifies the type of marker.

SETTING-
Identifies the type of setting.

STAMPING-
Identifies the stamping on the disk.

                          
Entity and Attribute Detail Citation
                            
All values were obtained from the NGA Datasheet
available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>

                          

Distribution Information 

Distributor
Contact Information
Contact Person Primary
Contact PersonNGS Information Services Branch
Contact OrganizationNOAA, National Geodetic Survey
Contact PositionInformation Specialist
Contact Address
Address TypeMailing and Physical Address
Address SSMC3/9202 1315 East-west Highway
CitySilver Spring
State or ProvinceMD
Postal Code20910
CountryUNITED STATES

Contact Voice Telephone301-713-3242
Contact Facsimile Telephone301-713-4172
Contact Electronic Mail Addressngs.infocenter@noaa.gov
Hours of Service9:00am to 4:30pm EST
Contact Instructions
                                Prefer EMail
                              

Resource DescriptionDatasheet Shapefile
Distribution Liability
                        The distributor does not assume liability
                      
Standard Order Process
Digital Form
Digital Transfer Information
Format NameShapeFile
Format Version Number1.0
Format Version Date2013
File Decompression TechniqueDownload options include PC Zip and Unix compressed tar

Digital Transfer Option
Online Option
Computer Contact Information
Network Address
Network Resource Name<http://www.ngs.noaa.gov/cgi-bin/datasheet.prl?Explain=ShapeFiles>

Access Instructions
                                        Distributed through http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
                                      
Online Computer and Operating System
SUN Solaris


Feesfree if you retrieve it yourself


Metadata Reference 

Metadata Date2013-05-13
Metadata Contact
Contact Information
Contact Person Primary
Contact PersonNGS Information Services Branch
Contact OrganizationNOAA, National Geodetic Survey
Contact PositionInformation Specialist
Contact Address
Address TypeMailing and Physical Address
Address SSMC3/9202 1315 East-west Highway
CitySilver Spring
State or ProvinceMD
Postal Code20910
CountryUNITED STATES

Contact Voice Telephone301-713-3242
Contact Facsimile Telephone301-713-4172
Contact Electronic Mail Addressngs.software@noaa.gov
Hours of Service9:00am to 4:30pm EST
Contact Instructions
                                Prefer EMail
                              

Metadata Standard NameFGDC Content Standards for Digital Geospatial Metadata
Metadata Standard VersionFGDC-STD-001-1998
Metadata Time Conventionlocal time


Metadata Access Constraints Geodetic Data are in the public domain, not restricted from access or distribution.
Metadata Use Constraints
not restricted; Geodetic Data, including software were developed and compiled with U.S. Government funding; no proprietary rights may be attached to them nor may they be sold to the U.S. Government as part of any procurement of ADP products or services.
Metadata Security Information
Metadata Security Classification SystemDOD
Metadata Security Classificationunclassified
Metadata Security Handling Description
none

Metadata Extensions
Online LinkageN/A
Profile NameN/A