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file://\\OCTO-5GS23W2\E$\ProductionFiles\Ortho_2013\Orthophotos_2013.gdb
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FGDC
D.C. Office of the Chief Technology
GIS Data Coordinator
(202) 727-2277
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
Mon - Fri 8:30am to 5:30pm EST
20231005
ArcGIS Metadata
1.0
GIS Data Coordinator
D.C. Office of the Chief Technology
(202) 727-2277
"200 I Street SE, 5th Floor"
Washington
DC
20003
US
octo@dc.gov
Mon - Fri 8:30am to 5:30pm EST
Most DC GIS datasets can be downloaded from "http://dcgis.dc.gov" on the data center page. Orders can also be made by contacting OCTO GIS at "dcgis@dc.gov", especially for datasets not available for download
Ortho_2013
2014-06-06
Office of the Chief Technology Officer, GIS Data Coordinator
"Fugro EarthData, Inc.
Frederick, Maryland
Remote-sensing Image
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This metadata record describes the acquisition and production of natural color digital ground orthoimagery covering Washington, D.C. The digital orthophotography is composed of 24 bit natural color digital orthos at a scale of 1 to 1,200 with a 0.15 meter pixel resolution.</SPAN></P></DIV></DIV></DIV>
This orthoimagery has been supplied to the District of Columbia Government, Office of the Chief Technology Officer for use in a geographic information system (GIS) for planning and management purposes.
Office of the Chief Technology Officer
D.C. Office of the Chief Technology
GIS Data Coordinator
(202) 727-2277
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
Mon - Fri 8:30am to 5:30pm EST
Geographic Names Information System
United States of America
USA
"Washington, D.C." District of Columbia
EDI Thesaurus
Imagery
Digital Orthos
Aerial Acquisition
Orthoimagery
Aerotriangulation
ADS80
Digital Elevation Model
DEM
DSM
Digital Surface Model
ISO 19115 Topic Categories
imageryBaseMapsEarthCover
elevation
ISO 19115 Topic Categories
elevation
imageryBaseMapsEarthCover
Imagery
Digital Orthos
Aerial Acquisition
Orthoimagery
Aerotriangulation
ADS80
Digital Elevation Model
DEM
DSM
Digital Surface Model
imageryBaseMapsEarthCover
elevation
elevation
imageryBaseMapsEarthCover
United States of America
USA
"Washington
D.C." District of Columbia
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Acknowledgment of the DC Geographic Information Systems Program (DC GIS): The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.</SPAN></P></DIV></DIV></DIV>
Acknowledgment of the DC Geographic Information Systems Program (DC GIS): The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.
Esri ArcGIS 10.2.2.3552
true
-77.122373
-76.900716
39.001746
38.785481
Ground Condition
2014-04-15
1
-77.122373
-76.900716
39.001746
38.785481
This data has been produced to be fully compliant with the American Society for Photogrammetry and Remote Sensing Accuracy Standards for Class 1 mapping requirements (ASPRSC1) at a scale of 1 to 1,200
"ompliance with the accuracy standard was ensured by the placement of GPS ground control. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical bundle aerotriangulation adjustment. The residuals of the adjustment met the required standards for accuracy which are 1 part in 10,000 of the flying height for the horizontal position (X and Y) and 1 part in 9,000 or better of the flying height in elevation (Z). 2. The DTM (Digital Terrain Model) data was checked against the project control. The technician visited and confirmed the accuracy of the project mass points during initial compilation. 3. Any topographic data was checked for edge match, consistency of attribution, and cartographic quality through visual inspection. 4. Digital orthophotography was validated through an inspection of edge matching and visual inspection for image quality.
100%
This data has been produced to be fully compliant with the American Society for Photogrammetry and Remote Sensing Accuracy Standards for Class 1 mapping requirements at a scale of 1 to 1,200 with a 15 centimeter pixel resolution.
N/A
TerraSurv, Inc, under contract to Fugro EarthData Inc. successfully established ground control for the project area. A total of 5 ground control points for the project were acquired using GPS for both vertical and horizontal coordinate values.
600
Report of GPS Survey for Washington, DC
Ground Control
2012-04-26
"TerraSurv, Inc"
model
Ground Condition
2012-04-02
2012-04-03
The aerial imagery acquisition over Washington, DC was flown to support the creation of digital orthophotography with a 15 centimeter pixel resolution. The aerial photographic mission was composed of a total of 3 lifts consisting of 42 flight lines using a Cessna Conquest twin tubroprop. Photography was obtained at an average altitude of 4,850 feet above mean sea level. Aerial photography was collected in conjunction with airborne GPS; the stationary GPS receiver was positioned over a control point located at the airport. All imagery was collected using the Leica ADS80/82 digital pushbroom sensor.
Aerial Imagery Acquisition
Aerial Acquisition
2013-10-31
D.C. Office of the Chief Technology
remote-sensing image
Ground Condition
2013-10-24
EarthData utilized an InfoTerra Pixel Factory workflow for processing the aerotriangulation for the orthoimagery of project area. The airborne GPS data was processed and integrated with the inertial measurement unit (IMU). The resulting imagery and control were imported into the InfoTerra Pixel Factory system for use in the aerotriangulation. The ADS80 imagery was downloaded onto the EarthData server and brought over to the UNIX based InfoTerra Pixel Factory system. The ground control was used in conjunction with the processed airborne global positioning system (ABGPS) results for the aerotriangulation. The ground control points were read in all available imagery and tie points between flight lines were selected. A fully analytical bundle adjustment was run. The properly formatted InfoTerra Pixel Factory results were used for subsequent processing. All final results were output into an AT report which is being delivered with the final orthoimagery.
2013-11-26
"Fugro EarthData, Inc.
Frederick, Maryland
withheld
withheld
The customer supplied DSM was for rectification of the orthoimagery with the exception of the downtown true ortho project area. For this area the InfoTerra Pixel Factory was used in the processing of the DSM for orthorectification. InfoTerra Pixel Factory digital surface modeling is based on an auto correlated pixel-matching system within the InfoTerra Pixel Factory software. The auto correlated digital surface model (DSM) surface represents the initial surface model. The following is the process used. 1.The technician verified that there were no voids, and that the data covered the project limits. 2. The technician runs a macro to automatically filter out non-ground features such as trees, noise, and buildings. 3. The technician checks each tile and manually edits where necessary. 4. The technician interpolates voids left over from feature removal. 5. The resulting digital elevation model (DEM) is used in the rectification of the orthoimagery.
2013-12-18
"Fugro EarthData, Inc.
Frederick, Maryland
withheld
withheld
withheld
The digital orthophotography is comprised of a 24 bit, natural color and color infrared, 15 cenitmeter pixel resolution ground orthos for the project area. The InfoTerra Pixel Factory was used in the generation of the orthoimagery covering all project tiles. After the rectification process was run using the processed DEM surface, quicklook (reduced resolution rectification) ortho for all flight lines were created. The quicklook orthos were radiometrically balanced using FEDI proprietary software. The radiometrically balanced imagery were then re-imported into the Pixel Factory and the histogram from the quicklook was applied to the full resolution imagery. Quicklook orthos were also used to generate the automatic mosaic lines, which were placed to mosaic the full resolution ortho of the ADS80 imagery strips. An initial QA/QC was performed by the technician to ensure that the mosaic lines were appropriately placed and that there was appropriate imagery coverage. The final imagery data set is removed from the InfoTerra environment in a process called ""packaging"" where the individual tiles are created. All data processing in the InfoTerra system is performed in UTM meters; it is during packaging that final datum and projection are defined. The created tiles are reviewed to ensure the output was successful and ground control points are measured and verified for accuracy. QA/QC was performed on each tile looking for anomalies, smears and other indications of problems within the digital Orthophoto creation process, interactive radiometric adjustment applied where needed. Additional global radiometric adjustments were applied to the completed orthos in Adobe Photoshop to enhance the color and/or contrast as needed. The orthos were clipped to the approved project boundary and produced in a the TIF/TFW format. The data is delivered in Maryland State Plane coordinates NAD 83 meters on external hard drives.
2014-02-14
"Fugro EarthData, Inc.
Frederick, Maryland
withheld
withheld
2
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399000.000000 136200.000000
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Ortho2013_Final
OBJECTID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Coordinates defining the features.
Raster
Name
Shape_Length
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
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