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20231004
14364500
20231004
14364500
D.C. Office of the Chief Technology
GIS Data Coordinator
N/A
(202)727-5660
441 4th Street NW Suite 930
Washington
D.C.
20001
AF
dcgis@dc.gov
8:30 am - 5:00 pm
20231004
ArcGIS Metadata
1.0
D.C. Office of the Chief Technology
GIS Data Coordinator
(202)727-5660
441 4th Street NW Suite 930 South
Washington
D.C.
20001
US
dcgis@dc.gov
8:30 am - 5:30 pm
None
go to http://opendata.dc.gov
http://dcgis.dc.gov
Ortho_2015
2015-04-24
DC GIS
200 I Street SE, 5th flooe, Washington, DC, 20003, US
remote-sensing image
2015 Orthophoto - This document describes the processes used to create the orthoimagery data produced for the District of Columbia from 2015 digital aerial photography. It was flown in mid to Late April, completed on April 24, 2015.DUE TO THE LOW ALTITUDE FLOWN TO CAPTURE THE COMPLETE IMAGERY FOR THE 2015 SENSOR FLIGHT, THERE IS INCOMPLETE AERIAL PHOTOGRAPHY COVERAGE AROUND THE WHITE HOUSE AND CAPITOL. FOR THESE AREAS, 2013 IMAGERY WAS MERGED IN USING STREET CENTERLINES TO DEFINE THE 2013 MERGE AREAS TO MINIMIZE DISTORTION OF FEATURES.. The project area covers the entire District of Columbia which is approximately 69 square miles. The digital imagery was used to create natural color digital orthophotography with 8cm pixel resolution. The final orthophotography deliverable products for this project consist of 328 ortho tiles at a scale of 1 to 2400. The tile dimensions are 800 meters by 800 meters. A corresponding MrSid image was created by mosaicking the 328 ortho tiles together and compressing the image using an 80 to 1 compression ration. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters. METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.
This data is used for the planning and management of Washington, D.C. by local government agencies.
DC GIS
D.C. Office of the Chief Technology Officer
GIS Data Coordinator
(202) 727-5660
200 i Street SE, 5th floor
Washington
D.C.
20003
US
dcgis@dc.gov
8:30 AM - 5:00 PM
D.C.
Washington
D.C.
District of Columbia
United States of America (USA)
Geographic Names Information System
Orthophotography
Planning
Imagery
Orthos
Aerial Photography
imageryBaseMapsEarthCover
imageryBaseMapsEarthCover
ISO 19115 Topic Categories
Orthophotography
Planning
Imagery
Orthos
Aerial Photography
imageryBaseMapsEarthCover
imageryBaseMapsEarthCover
D.C.
Washington
D.C.
District of Columbia
United States of America (USA)
For data terms and conditions, go to http://dc.gov/page/terms-and-conditions-use-district-data
For data terms and conditions, go to http://dc.gov/page/terms-and-conditions-use-district-data
ESRI ArcCatalog 9.2.6.1500
true
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N/A
Compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS and IMU data. The elevation data were generated by autocorrelation and manual processes. An RMSE value for each tile was calculated based on the photos utilized in the production of the tile by comparing the AT X and Y coordinates. This value represents an estimate of the accuracy of the horizontal coordinate measurements in the tile expressed in meters.
Compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data.
The horizontal accuracy of the orthorectified images is mainly determined by the accuracy of the aerotriangulation and digital terrain model (DTM). All results were examined for consistency and its compliance with the ASPRS Standards for Large Scale Mapping at 1 to 1200 which states that the orthos will meet 1 foot RMSE at the 95% confidence clevel.
N/A
AGPS/Aerotriangulation Step: The airborne GPS data was processed and integrated with the inertial measurement unit (IMU) using Leica Inertial Explorer. Existing and new ground control was used in conjunction with the processed airborne global positioning system (AGPS) results for the aerotriangulation. The resulting imagery, EO and control were imported into Inpho Match-AT for use in the aerotriangulation. Ground control and LiDAR vertical points were measured followed by a fully analytical bundle adjustment. The results of the AT were provided to the compilation and ortho teams for vector and orthoimagery production. A formal AT report was produced.
2015-04-24
Sanborn Map Company
AF
DEM Step: LiDAR DEM used for orthorectification was collected simultaneously with the RCD30 imagery. LIDAR was collected to be compliant with USGS V1.2 specifications for Quality Level 1. The classified ground class was further processed to model keypoint (MKP) dataset for use in the orthorectification of the imagery. In the downtown true ortho area, this MKP dataset was used for the ground surface, while stereo compiled building polygons were utilized for performing the true ortho rectification of select buildings. ImageStation DTM Collection software was used to convert the linework into terrain models for use in Image Station OrthoPro orthorectification software.
2015-04-24
Sanborn Map Company
AF
ORTHO IMAGERY Step: Ortho rectification - This task involved ortho rectification of the raw digital raster images that were created from processing of RCD30 camera data. A number of image processing techniques were used to maximize the quality of the deliverable images. All operations were performed using Sanborn's proprietary software and Commercial Off-The-Shelf (COTS) software. The unrectified raster images were georeferenced to an auto-correlated DEM using the digital aero triangulation result and aerial camera data. Digital ortho photography was created by draping the unrectified raster images over their corresponding digital terrain models. All relief displacement was removed from the raw image files at ground level on a pixel-by-pixel basis, yielding a set of ortho rectified digital photo images. Mosaicking was performed to ensure a perfect edge match between all orthophoto tiles. Seam lines were digitized interactively to ensure that no image flaws result from seam lines passing through tall structures. All ortho tiles were clipped to the tile grid with no overlaps nor gaps. Radiometric adjustment was performed to balance and match color tones, brightness and contrast of the imagery over the whole project. Color orthophotos were produced at 8-bit per channel, 4 band, resulting in 32-bit RGB, .GeoTIFF w/.tfw format images with a pixel size of 0.08 meters. Ortho tiles were generated according to a OCTO pre-approved ortho tile layout. Two areas, 1) surrounding the White House, and 2) surrounding the US Capitol Building were not able to be captured due to FAA flight restrictions over these locations. Existing orthoimagery from captured in 2013 was resampled to 0.08 meters and mosaicked with the 2015 orthoimagery to provide imagery coverage in these locations.
2015-04-24
Sanborn Map Company
(719) 593-0093
(719) 528-5093
1935 Jamboree Drive Suite 100
Colorado Springs
CO
80920
US
coloradosprings@sanborn.com
8:30 Am - 5:00 PM Mon - Fri
Quality Control Step
All orthophoto tiles were thoroughly inspected according to Sanborn QA/QC quality control procedures. Comprehensive visual inspection included looking for mosaicking, image smearing and color balancing errors across the entire project.
OCTO GIS also performed visual QA/QC on the ortho tiles.
2015-04-24
Sanborn Map Co and DC GIS
AF
This aerial photography was composed of approximately 52 flight lines and a total of 1552 exposures. Imagery was obtained at an altitude of 8,900 ft above mean terrain (AMT). The mission was flown with one Vecxel Ultracam X camera and collected ABGPS and IMU for each exposure.
Aerial Photography of Washington, D.C.
Aerial Photography of Washington, D.C.
2008-05-24
ground condition
2008-05-24
TerraSurv established 30 photo identification control points to support the aerotriangulation process. Continuously Operating Reference Station (CORS) station USNO (PIDAI7403) was used as the control for this project. The horizontal datum was the North American Datum of 1983, CORS adjustment (NAD 1983 CORS). The vertical datum was the North American Vertical Datum of 1988 (NAVD 1988).
Report of Survey Washington, DC Area
Report of Survey Washington, DC Area
2006-06-30
Ground Condition
2005-08-01
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