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Digital GeoData


Portion of Digital Raster Graphic (DRG) of Lake Lynn WV quad

Color Infrared (CIR) Digital Orthophoto (DOQ) of Lake Lynn WV

Wilmington Vector Street Data

Standard NED for Lake Lynn WV quad

Portion of Digital Raster Graphic (DRG) of Lake Lynn WV quad with DOQQ overlay and Vector Data


Go to Digital Raster Graphic (DRG) Home

Go to Digital Orthophoto (DOQ) Home

Vector Home

Go to National Elevation Dataset (NED) Home


Sample of Digital Raster Graphics (DRG) Available from GeoMart

A Digital Raster Graphic (DRG) is a scanned image of a USGS standard series topographic map. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map.

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Sample of Digital Orthophoto (DOQ) Available from GeoMart

A Digital Orthophoto Quadrangle (DOQ) is a computer-generated image of an aerial photograph in which the image displacement caused by terrain relief and camera tilt has been removed. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map.

DOQs are black and white (B/W), natural color, or color-infrared (CIR) images with 1-meter ground resolution.

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Sample of Digital Vector Graphics Available from GeoMart

Vector Graphic are CAD/GIS drawings where each road, stream, and contour line are individual entities. This is completely different from DRGs which are simply paper maps that have been run through a scanner and geo-referenced.

The entities on our Vector maps are on many different layers, according to their type. For example, major roads are on a different layer than minor roads or streams. Additionally, contour lines are 3D polylines. This makes for a very easily manipulated CAD or GIS drawing.

The difference between Vector maps and Raster maps is analogous to the difference between a word processing document and a scanned document. The word processing document is a whole lot easier to change, move words around, add new paragraphs, or run a spelling checker than a scanned document. Likewise, it is much easier to modify, move, add new entities, or analyze a vector CAD drawing than the corresponding scanned map.

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Sample of National elevation dataset (NED) available from GeoMart

Digital elevation model (DEM) data are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM) projection or to a geographic coordinate system. The grid cells are spaced at regular intervals along south to north profiles that are ordered from west to east.

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