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dataset
Office of the Chief Technology Officer
(202) 727-2277
(202) 727-6857
200 I Street SE
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
GIS Data Coordinator
GIS Data Coordinator
Office of the Chief Technology Officer
Office of the Chief Technology Officer
20261016
ArcGIS Metadata
1.0
Raster Dataset
external
83f4f688699ea26da618314aa1b8dd2446e8d768
Office of the Chief Technology Officer
(202) 727-2277
(202) 727-6857
200 I Street SE
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
GIS Data Coordinator
GIS Data Coordinator
Office of the Chief Technology Officer
True
Office of the Chief Technology Officer
2009-08-24T00:00:00
Pictometry Inc
Ortho_2009
Office of the Chief Technology Officer
(202) 727-2277
(202) 727-6857
200 I Street SE
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
GIS Data Coordinator
GIS Data Coordinator
Office of the Chief Technology Officer
Office of the Chief Technology Officer
<div style='text-align:Left;'><div><div><p><span>2009 Aerial Photography (1 foot resolution) - Sector Tiles Pictometry provided as part of the 2009 photo capture were exported to tiff and provided as a raster catalog. An Ortho Sector Tile is typically a 1 foot GSD ortho mosaic tile covering a 1-square mile area that is created by deresolving the best available orthogonal images captured. Images are not radiometrically balanced, may have observable cut lines and could consist of imagery taken over a period of several days. Note - Print at your own risk, the images have seamlines between some tiles and the Pictometry logo is in the southeast corner of every tile. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.</span></p></div></div></div>
This data is used for the planning and management of Washington, D.C. by local government agencies.
Office of the Chief of Technology Officer
Geographic Names Information System
Washington
D.C.
D.C.
United States of America (USA)
District of Columbia
imageryBaseMapsEarthCover
Orthos
Orthophotography
Planning
Aerial Photography
Imagery
tiff
aerial photography
orthophoto
Washington DC
District of Columbia
Orthophoto 2005
DC
historic
imagery
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.
<div style='text-align:Left;'><div><div><p><span>This work is licensed under a </span><a href='https://creativecommons.org/licenses/by/4.0' target='_blank' style='text-decoration:underline;'><span><span style='text-decoration:underline;'>Creative Commons Attribution 4.0 International License</span></span></a><span>. </span></p><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>
ground condition
2009-01-11
GSD: Pixels have a 1 foot GSD. Coverage: Coverage is 1 square mile. Overlap: Zero overlap, tiles have contiguous edges. Feathering: Component images are feathered together using a 20-pixel feather region. Cut-Lines: Cut lines are selected based on distance from nadir and do not take ground features into account. Radiometric Balancing: Images are color balanced, however some radiometric differences may be seen across flat fields such as water or grassy planes. Building Lean: Building lean is minimized by utilizing N5 orthogonal input images when available, however no other building lean corrections are performed. Elevation Data: 1995 1 meter contours.
Esri ArcGIS 13.5.0.57366
1
-77.121445
-76.896970
39.009292
38.791780
Washington DC
Pictometry Inc
Pictometry Inc
Office of the Chief Technology Officer
(202) 727-2277
(202) 727-6857
200 I Street SE
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
GIS Data Coordinator
GIS Data Coordinator
Office of the Chief Technology Officer
Office of the Chief Technology Officer
Last metadata review date: 07/24/07
N/A
Pixel placement accuracy is based on the accuracy of the component imagery. N5 orthogonal images are used when available to maximize accuracy, however Pictometry does not warrant any pixel placement accuracy. The most significant source of error is generally the error introduced by the elevation data. Pictometry's orthogonal images provide the coordinate accuracy fulfilling most planemetric requirements, however, Pictometry data is not intended for authoritative definitive mapping or surveying replacement. If there is a need for authoritative mapping products, additional work is required by licensed individuals in order to certify Pictometry's orthogonal imagery. Alternatively, a separate, authoritative orthogonal image capture can be done and those orthogonal images used inside of Pictometry. Our oblique images are unique to Pictometry and are intended to provide data not available elsewhere and lateral views with more visual information, such as building stock analysis. In Pictometry the orthogonal and oblique images are linked for your convenience and additional study. With a few clicks you can find the revealing lateral views, height measurements, and other information afforded by the oblique images while using the coordinate accuracy afforded by the orthogonal images.
N/A
Aerial Photography of Washington, D.C.
Pictometry
2007-04-06
Pictometry Inc.
remote-sensing image
http://www.pictometry.com
ground condition
2005-04-04
Sensor Size Pixels: 4008 x 2672 (or 3208 x 2672 for some Community level imagery) in a Landscape orientation. Image Format Industry-standard image format with proprietary image trailer, including JFIF (JPEG), TIFF, and BMP. Image Quality Images will have an unobstructed view of the ground. In controlled airspace around airports, etc., and in areas of rapid elevation changes, the image footprint sizes and resolutions may vary. There may be varying degrees of ground illumination and color variations due to lighting and cloud shadows. Measurement Accuracy 0.5% measurement error, excluding user pixel selection error Pixel Placement Accuracy Pictometry provides a visualization system and therefore does not certify image accuracy. However, some Pictometry customers have done their own certification on the Pictometry data after delivery and have shared their results. On average, customers have been seeing better than 1.0-meter RMS error at a 95% confidence level (NMAS 1:1200) for orthogonal imagery over relatively flat terrain or in areas with accurate elevation data, and 2.0-meter RMS error at a 95% confidence level (NMAS 1:2400) for more varied terrain or in areas with poor elevation data. However, Pictometry does not guarantee these accuracies and your results may vary. Sensor Orientation Pictometry utilizes an IMU (Inertial Measurement Unit), ground station post-corrected differential GPS, and Kalman filtering to achieve a high degree of positional and directional accuracy. Sensor Positional Accuracy mean 15cm absolute Sensor Directional Accuracy 0.015 degrees absolute (roll/pitch) 0.035 degrees absolute (heading) Ortho-Rectification The images are ortho-rectified to back out the optical deviations of the capture system and the variations due to elevation changes (utilizing the best DEM data available, including customer provided DEM data), resulting in geographically square pixels aligned to a rectilinear grid. This grid can be one of any number of coordinate systems, including Latitude/Longitude, State Plane, UTM, and more. The desired coordinate system should be specified in the contract, or a default coordinate system will be used. Image Export J FIF (JPEG), TIFF, BMP EFS software can be utilized to export the images into any of the above industry-standard formats. The orthogonal images can optionally be re-projected during this export process, and an associated geography file can be created as well for use in importing the images into GIS mapping software. Image Tiling Individual orthogonal images are edge-feathered and mosaiced to produce orthogonal image tiles with tile sizes selected to balance single image coverage as well as manageability of open images. These orthogonal tiles provide continuous coverage across the area of interest. While some color balancing is done, these orthogonal tiles are not fully radiometrically balanced or edge-matched.
2007-04-06
Pictometry Inc
888-771-9714
585-486-0098
100 Town Centre Drive, Suite A
Rochester
NY
14623-4260
US
info@pictometry.com
8:30 Am - 5:00 p,
Analytical Aerotriangulation
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