20261007
16152200
1.0
FALSE
002
Ortho_2002
388330.797909
407997.944436
123741.009772
147797.032786
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_StatePlane_Maryland_FIPS_1900
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Name,MinPS,MaxPS,LowPS,HighPS,Tag,GroupName,ProductName,CenterX,CenterY,ZOrder,Shape_Length,Shape_Area
4319.87842981735
0.299991557626205
9.59972984403857
-1
150000000
5000
20261008
12015000
20261008
12031000
FGDC
dataset
The person responsible for the metadata information.
U.S. Geological Survey
The National Map ER program manager
703 648-6287
703 648-4603
521 National Center
Reston
VA
20192
phearn@usgs.gov
20261008
ArcGIS Metadata
1.0
U. S. Geological Survey, EROS Data Cemter
Customer Services
1-800-252-4547
605-594-6151
1-888-ASK-USGS (1-888-275-8747)
605-594-6589
47914 252nd Street
Sioux Falls
SD
57198-0001
US
custserv@usgs.gov
Monday - Friday, 0800-1600 Central Time
Data may be ordered using Earth Explorer at http://edcsns17.cr.usgs.gov/EarthExplorer/.
None
Contact EDC for other off-line media or information on other media types.
675.799
700
megabytes
withheld
Raster Dataset
Ortho_2002
U.S. Geological Survey
U.S. Geological Survey
Sioux Falls, SD
raster digital data
Shapefiles showing the orthophotos used for 7.5 minute quad area are:
DC_S_Index.shp
DC_ DOQQ Photo_Date.shp
<div style='text-align:Left;'><div><div><p><span>An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. For this dataset, the natural color orthoimages were produced at 0.3-meter pixel resolution (approximately 1-foot). The design accuracy is estimated not to exceed 3-meter diagonal RMSE (2.12m RMSE in X or Y). Each orthoimage provides imagery for a 1500- by 1500-meter block on the ground. The projected coordinate system is UTM with a NAD83 datum. There is no image overlap been adjacent files. The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage. Each GeoTiff file is a mosaic of orthoimages covering a USGS quarter-quadrangle. The index of orthoimage chips for each USGS quarter-quadrangle is in the file ortho_quad_index.mxd.</span></p></div></div></div>
Aerial Photography (Orthophoto) - 2002
The quarter-quadrangle mosaics of orthoimage chips were created as part of an implementation of The National Map (TNM) to provide large-scale imagery of the area.
Cassandra Ladino & Sharon Hamann worked on mosaicking the orthophotos into the 7.5-minute quads and prepared the indexes.
U.S. Geological Survey, Eastern Region Geography
The National Map ER project manager
703 648-6287
703 648-4603
521 National Center
Reston
VA
20192
US
phearn@usgs.gov
U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.
US
United States
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National Institute of Standards and Technology.
Washington Dc
Dc
Maryland
MD
Virginia
VA
West Virginia
WV
Geographic Names Information System (GNIS)
Alexandria
Anacostia
Annandale
Annapolis
Arcola
Ashby Gap
Baltimore East
Baltimore West
Barren Island
Beltsville
Benedict
Betterton
Blackwater River
Bluemont
Bowie
Brandy Station
Brandywine
Bristol
Broomes Island
Buckeystown
Cambridge
Catlett
Centreville
Chancellorsville
Charles Town
Charlotte Hall
Chestertown
Chicamoacomico River
Church Creek
Church Hill
Claiborne
Clarksville
Cockeysville
Colonial Beach North
Cov e Point
Curtis Bay
Dahlgren
Damascus
Deale
Earleville
East New Market
Easton
Edgewood
Ellicott City
Fairfax
Falls Churc
Finksburg
Fort Belvoir
Fowling Creek
Frederick
Fredericksburg
Gainesbille
Gaithersburg
Galena
Germanna Bridge
Germantown
Gibson Island
Golden Hill
Guinea
Gunpowder Neck
Hanesville
Harpers Ferry
Herndon
Hollywood
Honga
Hudson
Hughesville
Independent Hill
Indian Head
Jeffersonton
Joplin
Keedysville
Kensington
Kent Island
King George
La Plata
Langford Creek
Lanham
Laurel
Leesburg
Leonardtown
Libertytown
Lincoln
Love Point
Lower Marlboro
Manassas
Marshall
Mathais Point
Mechanicsbille
Middle River
Middleburg
Middletown
Midland
Mine Run
Mount Vernon
Nanjemoy
Nanticoke
Nokesville
North Beach
Occoquan
Odenton
Orlean
Oxford
Passapatanzy
Perryman
Piscataway
Point of Rocks
Poolesville
Popes Creek
Port Tobacco
Preston
Price
Prince Frederick
Purcellville
Quantico
Queenstown
Rappahannock Academy
Rectortown
Reisterstown
Relay
Remington
Richardsville
Ridgely
Rock Hall
Rock Point
Rockville
Round Bay
Round Hill
Saint Michaels
Salem Church
Sandy Spring
Savage
Seneca
Shepherdstown
Solomons Island
Somerville
South River
Sparrows Point
Spesutie
Stafford
Sterling
Storck
Swan Point
Sykesville
Taylor Island
Thoroughfare Gap
Tilghman
Towson
Trappe
Upper Marlboro
Upperville
Urbana
Vienna
Walkersville
Warrenton
Washington East
Washington West
Waterford
White Marsh
Widewater
Winfield
Wingate
Woodbine
Wye Mills
mosaic
orthoimage
natural color orthoimage
rectified photograph
district of columbia
aerial
orthophotos
dc
washington dc
<div style='text-align:Left;'><div><div><p><span>None. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.</span></p></div></div></div>
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-compatible format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer input peripherals or when the physical medium is delivered in damaged condition. Requests for adjustment of credit must be made within 90 days from the date of this shipment from the ordering site.
ESRI ArcCatalog 9.3.1.3500
true
-77.136244
-76.905116
38.999907
38.779837
ground condition
2002-04-07
While nominally 0.3 m ground resolution, due to security concerns, this data contains areas of intentional image distortion introduced in support of Homeland Security. Data distortion includes various degrees of blurring or radiometric filtering.
1
-77.134710
-76.907671
38.998116
38.781333
All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are not corrected unless the overall displacement exceeds one meter.
Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. Photography was flown during leaf-off in deciduous vegetation regions. Coastal areas and international boundary regions may have areas without images (void areas) in parts of the coverage. These void areas have a radiometric value of either zero (black) or 128 (uniform gray).
Compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data. The elevation data were generated by autocorrelation and manual processes. An RMS value for each tile was calculated based on the photos utilized in the production of the tile by comparing the aerotriangulation (AT) X and Y coordinates. This value represents an estimate of the accuracy of the horizontal coordinate measurements in the tile expressed in meters. No further processing was done on the orthoimages to affect the accuracy.
The horizontal accuracy of the orthorectified images is mainly determined by the accuracy of the aerotriangulation and digital elevation model (DEM). For each rectified photo, an RMSE value for all of the standard errors of the tie/pass/control points located in that photo and computed by the aerotriangulation solution was calculated. A proprietary program was developed to assign the RMSE value for a photo to all of the ortho tiles that were produced from each individual photo. The DEM accuracy assessment was achieved by comparing the aerotriangulation-derived elevation with the elevation of the DEM at the same X and Y coordinates. In addition, visual examination was employed to assess all tiles and their relative edge match. All results were examined for consistency and compliance with the NSSDA accuracy standard.
0.1
Metadata imported.
withheld
OCTO GIS staff reprojected the orthophoto from UTM Zone 18 to Maryland 1983/91 State Plane, coordinates in meters, to conform to the District projection standard. Then, staff compressed the newly projected ortho using Mr. SID using a 23:1 ratio to make the image under 700MB in size.
GIS Data Coordinator
Office of the Chief Technology Officer
202-727-1761
441 4th St NW, Suite 930 South
Washington
DC
20001
US
dcgis@dc.gov
8:30am - 5:30pm
The original imagery came from true color stable-base aerial photography film flown at 7,500 feet above average ground elevation. The digital raster files for each orthoimage chip provide imagery used in the digital orthoimage.
200
Orthoimages for the Washington DC area
orthoimages
1994
U.S. Geological Survey
U.S. Geological Survey
Sioux Falls, SD
remote sensing image
publication date
Mosaic processing was done with ERDAS Imagine 8.5 software. The 4 quarter quadrangles were mosaicked using the cut lines to eliminate the overlap areas for the mosaic raster file. Standard default options for the cutlines were used, with the output cell size at x=1.000 meter x=1.000 meter; output data type: unsigned 8-bit
2003-06
U.S. Geological Survey, Eastern Region Geography
Information Technology Specialist
703 648-4128
703 648-5542
519 National Center
Reston
VA
20192
US
shamann@usgs.gov
orthoimages
3
81405
0.299992
66738
0.299992
1
1
0
388330.797909 123741.009772
388330.797909 147797.032786
407997.944436 147797.032786
407997.944436 123741.009772
398164.371172 135769.021279
Washington DC area
1
0
388330.797909 123741.009772
388330.797909 147797.032786
407997.944436 147797.032786
407997.944436 123741.009772
398164.371172 135769.021279
EPSG
4.5(3.0.1)
Band_1
255.000000
0.000000
8
Band_2
255.000000
0.000000
8
Band_3
255.000000
0.000000
8
For natural color orthoimagery from file, a digital number from 0 to 255 is assigned to each pixel in each display band in a three-band image represented by red, green, and blue (RGB). Areas where the rectification process is incomplete because of incomplete data (that is, lack of elevation data, gaps) are represented with the numeric value of 0.
Standards for Digital Orthophotos, 1996: U.S. Department of the Interior, U.S. Geological Survey, Reston, VA.
USGS_DCMosaic02.sid.vat
Table
256
OID
OID
OID
4
0
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
0
0
0
Count
Count
Integer
0
0
0
USGS_DCMosaic02.sid(Band_2).vat
Table
256
OID
OID
OID
4
0
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
0
0
0
Count
Count
Integer
0
0
0
USGS_DCMosaic02.sid(Band_3).vat
Table
256
OID
OID
OID
4
0
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
0
0
0
Count
Count
Integer
0
0
0