Virginia Geographic Information Network (VGIN)
200702
COLOR07
SDE raster digital data
Richmond, Virginia
Virginia Geographic Information Network (VGIN)
withheld
COLOR07
These files contain Digital Orthophoto files for the State of Virginia developed from imagery acquired in spring 2006 and 2007. In the spring of 2006, the Commonwealth of Virginia, through the Virginia Geographic Information Network Division (herein referred to as VGIN) of the Virginia Information Technologies Agency (VITA) contracted with the Sanborn Map Company to provide aerial data acquisition, ground control, aerotriangulation and development of statewide DTM and digital orthophotography. Approximately 15% of the State was acquired in the year 2006 and the balance in 2007. All data acquired in 2006 is jurisdiction based. The data acquired in 2007 includes overlap along the boundaries of jurisdictions captured in the previous year 2006. This ensures each jurisdiction has full coverage from either Year 2006 or 2007 without 'mixing' imagery vintage along the edge of a jurisdiction. The project encompasses the entire land area of the Commonwealth of Virginia. The State boundary is buffered by 1000'. Coastal areas of the State bordering the Atlantic Ocean or the Chesapeake Bay are buffered by 1000' or the extent of man-made features extending from shore. The entire State was intially designed to support 1"=200' (1:2400) scale mapping. Jurisdictions throughout the State were provided an option to upgrade to a 1"=100' (1:1200) map scale. All data development processes for the DTM conform to the ASPRS Draft Aerial Photography Standards (1995) and Model Virginia Map Accuracy Standards (1992), which generally follow the ASPRS Accuracy Standard for Large-Scale Mapping (1990) for relevant mapping scales. The DTM supports the creation of 6-inch or 1-foot map orthoimagery at the relevant scales.
The aerial photography and creation of the DTM and subsequent othophotos was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS analysis. Orthophotography along with DTM data typically provides an accurate base for digitally representing geographic features upon which a GIS is built. The Virginia Geographic Information Network (VGIN) is the lead public agency in the Commonwealth for spatial data and GIS. VGIN's mission is to facilitate the cost-effective development and use of spatial data, GIS, and related technologies in organizations throughout the Commonwealth.
The following jurisdictions were upgraded to 1"=100' mapping in year 2006: Alexandria, Bedford City, Bristol City, Charlottesville, Culpepper, Fredericksburg, Hampton, Harrisonburg, Lexington City, Norfolk, Norton City, Portsmouth, Purcellville, Prince William, Radford City, Roanoke, Salem City, Virginia Beach, Warren, Washington, Waynesboro, Wythe, portions of Stafford (Quantico area), portions of Orange County, portions of Cumberland, portions of Franklin. The following jurisdiction were upgraded to 1"=100' mapping in year 2007: Colonial Heights, Fairfax, Fairfax City, Falls Church, Franklin City, Galax, Isle of Wight, James City, Lynchburg, New Kent, Poquoson City, Pulaski, Richmond City, Spotysylvania, Williamsburg, portions of Clarke, portions of Dinwiddie, portions of Lancaster, and portions of Scott.
en
200602
200704
REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.
ground condition
Irregular
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None
orthophotography
imagery
raster
None
Commonwealth of Virginia
Virginia
USA
Contact VGIN for information about regional and statewide VBMP datasets. For information about local datasets, contact the appropriate locality.
Any person not licensed as a land surveyor preparing documentation pursuant to subsection C of 54.1-402 of the Code of Virginia shall note the following on such documentation: "Any determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvements to real property or for flood plain determination." This VBMP data has been developed using procedures designed to produce data to National Standard for Spatial Data Accuracy (NSSDA) and is intended for use at 1" = 100' or 1" = 200' scale. It is requested that the Commonwealth of Virginia be cited for any use of the orthophotography as follows: "Imagery Courtesy of the Commonwealth of Virginia".
Stuart Blankenship
VGIN
VBMP Project Manager
mailing and physical address
11751 Meadowville Lane
Chester
VA
23836
USA
804-416-6208
804-416-6353
stuart.blankenship@vita.virginia.gov
8:00 AM - 5:00 PM EST
ESRI ArcCatalog 9.3.1.3000
Raster Dataset
No logical consistency tests were performed.
The project consisted of a total of approximately 47,000 total images in the Virginia South State Plane Zone for 1' = 200' and 1'=100' scale imagery.
The digital orthophotos were delivered as GeoTIFF with supplementary TFW files, as well as compressed MrSID files. The MrSID files were compressed at a ratio of 18:1. The 1"=200' mapping area orthophotos were provided at 1' resolution. The 1"=100' mapping area orthophotos were provided at 6" resolution. For the areas mapped to 1"=200' mapping standards, the aerial imagery was collected at 1"=1,200' (1:14400) at a flying height of 7,200 feet above the mean terrain. For the areas mapped to 1"=100' mapping standards, the aerial imagery was collected at 1"=600' (1:7200) at a flying height of 3,600 feet above the mean terrain. 1"=200' map data was segmented into 5,000' X 5,000' tiles. The 1"=100' map data was segmented into 2,500 X 2,500' tiles. The original film negatives were scanned at 14 microns using high accuracy transparent film scanners. The Ground control used to support the orthophoto mapping was collected by either paneling of permanent monuments or photographic identification of strategic points. The coordinates were collected via ground survey techniques. Z/I ISAT software was utilized for the aerotriangulation phase, using high accuracy softcopy stereo plotters. A photogrammetric project was created, adding camera data, photo data, ground control point data and exterior orientation data. An interior orientation was performed for the project photos, automatic pass and tie measurements were executed and finalized with manual measurement of surveyed ground control. The final bundle adjustment was executed using PhotoTriangulation (PhotoT) software. The data was photogrammetrically stereo-compiled to North American Datum 1983; Virginia State Plane North or South Zone as applicable. All DTM was newly collected from the imagery acquired in 2006 or 2007, using high accuracy stereo plotters and traditional manual photogrammetric techniques for collection of the breaklines and masspoints. The bridges were coded uniquely and later removed from the final DTM file.
200602
Dataset copied.
withheld
20100423
11031200
Metadata imported.
withheld
20110607
12525700
0
Raster
Pixel
110000
112500
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1.000000
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LZ77
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pixel codes
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row and column
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1.000000
survey feet
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983_HARN
NAD_1983_HARN_StatePlane_Virginia_South_FIPS_4502_Feet
Explicit elevation coordinate included with horizontal coordinates
1.000000
Band 1
Blue Band
Scanned from film
Band 2
Green Band
Scanned from film
Band 3
Red Band
Scanned from film
VGIN Coordinator
Virginia Geographic Information Network
VGIN Coordinator
mailing and physical address
11751 Meadowville Lane
Chester
VA
23836
USA
804-416-6198
vbmp@vgin.virginia.gov
Offline Data
ALL DATA IS PROVIDED "AS IS." The Commonwealth of Virginia, the Virginia Geographic Information Network and their respective, officers, agents and employees jointly and severally disclaim any and all representations or warranties, express or implied, written or oral, in fact or arising by operation of law, including any warranties of merchantability, fitness for a particular purpose, ACCURACY, CURRENCY, commercial value, or freedom of data from infringement of any THIRD PARTY intellectual property rights.
Contact VGIN for ordering information.
20120319
Virginia Geographic Information Network
Stuart Blankenship
VBMP Project Manager
mailing and physical address
11751 Meadowville Lane
Chester
VA
23836
USA
804-416-6208
804-416-6353
stuart.blankenship@vita.virginia.gov
8:00 AM - 5:00 PM EST
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
en
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20110607
12525700
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20160908
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20160908
14055800
COLOR07
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11987500.000000
12100000.000000
3560000.000000
3670000.000000
1
Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
NAD_1983_HARN_StatePlane_Virginia_South_FIPS_4502_Feet
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NAD_1983_HARN_StatePlane_Virginia_South_FIPS_4502_Feet
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