Digital
Tags
Ortho, Arkansas, Arkansas GIS Office, Photography, Orthophotography, Imagery
Rectified orthoimagery for the State of Arkansas may serve as a basemap for GIS applications.
This metadata record describes the 15cm pixel resolution digital orthoimagery produced on behalf of the State of Arkansas by the Sanborn Map Company in support of the 2019 May Arkansas River Flood. The orthoimagery provided is 3-band (R, G, B), 8-bit per pixel and delivered in section tiles in compressed SID/SDW (40:1) and uncompressed GeoTiffs upon request. The data was collected between May 31st and June 10th over the Arkansas River during the record setting flooding observed during the imagery collection period. This orthoimagery is published in Universal Transverse Mercator Zone 15N, NAD 83, meters
There are no credits for this item.
This data is meant for use by requested parties. This data cannot be used without express consent.
Extent
There is no extent for this item.
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
State of Arkansas
None
This data may be used by the requested party for stated purposes and should not be re-distributed.
This data is meant for use by requested parties. This data cannot be used without express consent.
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
Specification requires that data meet a 120 cm ' RMSE requirement. Points were surveyed and compared to location within the orthophoto and found meet this specification.
N/A
Orthoimagery does not have inherent vertical accuracy.
Image acquisition by Sanborn Map Company occurred between January 23, 2017 and February 25, 2017 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.
8:00 AM - 5:00 PM M-F
Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT).
8:00 AM - 5:00 PM M-F
DEM Review/Updating. The LiDAR surface is reviewed and updated as needed to meet the final orthorectification standards set in this project.
8:00 AM - 5:00 PM M-F
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.
8:00 AM - 5:00 PM M-F
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 - Collected by the Survey Division of Arkansas Department of Transportation
ground condition
LiDAR data
ground condition
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.
This metadata record describes the 15cm pixel resolution digital orthoimagery produced on behalf of the State of Arkansas by the Sanborn Map Company in support of the 2019 May Arkansas River Flood. The orthoimagery provided is 3-band (R, G, B), 8-bit per pixel and delivered in section tiles in uncompressed compressed SID/SDW (40:1) and uncompressed GeoTiffs upon requests. The data was collected between May 29th and June 5th over the Arkansas River during the record setting flooding the observed during the imagery collection period. This orthoimagery is published in Universal Transverse Mercator Zone 15N, NAD 83, meters
Rectified orthoimagery for the State of Arkansas may serve as a basemap for GIS applications.
State of Arkansas
This data may be used by the requested party for stated purposes and should not be re-distributed.
This data is meant for use by requested parties. This data cannot be used without express consent.
N/A
Attribute accuracy does not apply to orthoimagery.
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.
This orthoimagery meets ASPRS Class 1 Accuracy Standards
Specification requires that data meet a 120 cm ' RMSE requirement. Points were surveyed and compared to location within the orthophoto and found meet this specification.
N/A
Orthoimagery does not have inherent vertical accuracy.
Raw Aerial Imagery - Collected by the Survey Division of Arkansas Department of Transportation
LiDAR data
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.
This metadata record describes the 15cm pixel resolution digital orthoimagery produced on behalf of the State of Arkansas by the Sanborn Map Company in support of the 2019 May Arkansas River Flood. The orthoimagery provided is 3-band (R, G, B), 8-bit per pixel and delivered in section tiles in uncompressed compressed SID/SDW (40:1) and uncompressed GeoTiffs upon requests. The data was collected between May 29th and June 5th over the Arkansas River during the record setting flooding the observed during the imagery collection period. This orthoimagery is published in Universal Transverse Mercator Zone 15N, NAD 83, meters.
DEM Review/Updating. The LiDAR surface is reviewed and updated as needed to meet the final orthorectification standards set in this project.
Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT).
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.
None for Raster Information
None for Raster Information
None