SDE Feature Class
Tags
Ortho, Orthophotography, Photography, Arkansas GIS Office, Imagery, Arkansas
Rectified orthoimagery for the Arkansas GIS Office may serve as a basemap for GIS applications.
This metadata record describes the 20cm pixel resolution digital orthoimagery produced for the Arkansas GIS Office by the Sanborn Map Company. The orthoimagery provided is 4-band (R, G, B, NIR), 8-bit per pixel and delivered in section tiles in uncompressed TIFF/TFW, compressed SID/SDW (40:1) and compressed county wide SID mosaics (40:1) formats. The data was collected between January 19 and February 28, 2023 at a nominal height of 5000 feet using an UltraCam Eagle camera. This orthoimagery is published in Universal Transverse Mercator Zone 15N, NAD 83, meters.
There are no credits for this item.
This work has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
Extent
There is no extent for this item.
State of Arkansas
None
This work has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
This work has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
Since the ortho images are raster products, the logical consistency is based on how well the images fit between image tiles and between individual photo frames used to produce the ortho mosaics. The images match within four pixels of each other through out the project area.
The ortho image tiles are checked for missing pixels, gaps, overlaps and other anomalies generally associated with digital orthophoto products. Any discrepencies in the ortho tiles are resolved through the use of proprietary and industry editing tools. Once the images are copied to the deliverable media they are further checked for naming, image completeness, and ability to be loaded in ArcMap.
N/A
Attribute accuracy does not apply to orthoimagery.
This orthoimagery meets ASPRS Class 1 Accuracy Standards
N/A
Orthoimagery is rectified using the AT solution and LiDAR. Once rectified, the orthoimagery is colorbalanced to the acceptable parameters established by the customer. Orthoimagery then undergoes manual quality control to check for issues as outlined in the Digital Orthoimagery Acceptance Criteria document. Issues such as warps, smears, misalignments, etc. are corrected using proprietary tools and Adobe PhotoShop. Upon completion of the QC process, the orthos are provided to the client for review in uncompressed TIFF/TFW.
Image acquisition by Sanborn Map Company occurred between January 19 and February 28, 2023 using a UltraCam Eagle Camera. Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground. GPS/IMU mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery.
Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT).
DEM Review/Updating. The LiDAR surface is reviewed and updated as needed to meet the final orthorectification standards set in this project.
Geodetic ground control is used to create a digital control file and control report as well as QC check of ortho accuracy. Predefined points within the project area are targeted and photo-identifiable locations are measured. These points along with their precise coordinates are used in the AT process and to check the horizontal accuracy of the resulting orthophotos.
ground condition
Raw Aerial Imagery - UltraCam Eagle Digital Aerial Camera, Sanborn Map Company. Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground. GPS/IMU mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery.
ground condition
LiDAR data
ground condition
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Feature geometry.
Esri
Coordinates defining the features.
None for Raster Information
None for Raster Information
This data is meant for use by requested parties. This data cannot be used without express consent.
None for Raster Information
None for Raster Information