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GIS Office:
Phone: (240) 313-2260
Fax: (240) 313-2261 

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GIS Office - Catalog of
Available Digital Spatial Data

Many Splat Types

The following describes the data available through the GIS Office for dissemination to the public:

This is comprised of orthographically corrected aerial photographs for the entire county. It was produced by contract vendor for the State of Maryland from an over-flight in the spring of 2007.  This data has been released into the public domain.  It is available from the United States Geologic Survey (USGS) and available for download on their web site: http://seamless.usgs.gov/index.php   The USGS places restrictions on the amount of data which can be downloaded at one time.  Washington County is providing this channel of distribution to assist those who may not have broad-band internet access or those who need the entire county on disk in the MrSID format.  

The orthophotos are  divided into 2396 individual tiles to cover Washington County in a TIFF and MrSID image format.  A digital file of the grid layout is available free of charge. A hardcopy map of the grid is available for $8.00. The following is a summary of the orthophoto specifications:

Natural Color, mid-spring flight, partial leaf-on

Formats: Individual Tiles:TIFF or MrSID
  All tiles covering county: MrSID only
Tile size: 2000’ x 3000’ = 138 acres = 0.22 sq. mi.
Total number of tiles covering the whole county: 2396 
Scale: 1” = 100’     (1 : 1200)
Projection:  Maryland State Plane
Units:  Feet
Datum: NAD83, NAVD88
Pixel Size: 6”
File size: Individual Tiles:70 MB +/- TIFF,  3.5 MB +/- MrSID
  All tiles covering county: 8.4 GB +/-

 

B.  2005 Ortho-Topo

This is comprised of orthographically corrected aerial photographs and planimetric-topographic data for the entire county. It was produced by contract vendor from an over-flight in the spring of 2005. The orthophotos are  divided into about 1700 individual tiles to cover Washington County in a TIFF and MrSID image format. The planimetric-topographic data is also tiled in the same manner and is available in GIS or CAD format.  A digital file of the grid layout is available free of charge. A hardcopy map of the grid is available for $8.00. The following is a summary of the ortho-photo and planimetric-topographic data:

Formats: Orthophoto:TIFF or MrSID natural color
  Plan-Topo: DWG or ESRI Geodatabase
Photo: MrSID county-wide
Composites: MrSID county-wide highly compressed
  MrSID county-wide 3’ pixel
  MrSID by planning region: Hancock, Clear Spring, Hagerstown, Smithsburg, Boonsboro, Gapland
Tile size: 2500’ x 3500’ = 200 acres = 0.3 sq. mi.
Total number of tiles covering the whole county:  1700+/-
Scale: 1” = 100’     (1 : 1200)
Projection:  Maryland State Plane
Units:  Feet
Datum: NAD83, NAVD88
Pixel Size: 6”
Contour:  2’
File size: Orthophoto:  102 MB +/- TIFF,  6 MB +/- MrSID
  Plan-topo:  1 MB +/- DWG,  2-4 +/-  GDB
Topo Features: contours, building footprint (>100 sq. ft.), edge of road, driveways, parking areas, railroads, forest, streams, ponds, swamp, ditches, fences, retaining walls, and bridges.

          

C.  2000 Ortho-Topo

This is comprised of orthographically corrected aerial photographs and planimetric-topographic data for the entire county, except for central Hagerstown. It was produced by contract vendor from an over-flight on March 18, 2000. The ortho-photos are divided into 470 individual tiles to cover Washington County in a TIF image format. The planimetric-topographic data is also tiled in the same manner and is in a CAD format.  A digital file of the grid layout is available free of charge. A hardcopy map of the grid is available for $8.00. The following is a summary of the ortho-photo and planimetric-topographic data:

Formats: Orthophoto: TIFF v6.0 (.TIF) gray scale by tile
  Plan-Topo: AutoCAD (.DWG) by tile
Tile size:  4400’ x 6800’ = 687 acres = 1.07 sq. mi.
Total number of tiles covering the whole county:  470
Scale: 1” = 200’ (1: 2400)
Projection: Maryland State Plane
Units: Feet
Datum: NAD83, NAVD88
Pixel Size: 1’
Contour: 4’
File size: Orthophoto: 30 MB +/-
  AutoCAD: 1 MB +/-
Topo Features: contours, building footprint (>200 sq. ft.), edge of road, centerline of road, tree line, streams, and bridges

   

D.  Other digital spatial data:

The GIS Office maintains other layers available for licensing. These are updated on a delayed basis; official changes in any of these areas are not immediately reflected in these GIS layers.  They are available in GIS and CAD format. The GIS format is ESRI Geodatabase. The CAD format is AutoCAD DWG.

E.  Hardcopy Plots:

The photo or topo data can be purchased as a hardcopy plot at the design scale on "D" size 20# bond paper.  It is copyrighted and shall not be copied, scanned, digitized or otherwise duplicated.  Only whole tiles can be purchased.

Notes:

rev. date July 1, 2010

Page Modified
6/30/10 2:11 PM


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