Overview- Contour Vector Maps from DEMs

If you are looking for a low-cost alternative to having contour information from USGS 7.5 minute quads in a vector format, then consider our service of extracting contours from Digital Elevation Models.  DDS, Inc. can provide a fully-editable, CAD or GIS ready contour map of any 7.5 minute quad in the USA!  The resulting file closely represents the original topography information on a 7.5 minute map with all "z-values" (elevation values) retained as continuous polylines, with contour intervals at the same interval as the original map, and the client can specify the map projection.   Client may also specify a different contour interval than what is shown on the USGS topo map.

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If you need help locating a USGS quad map name, try our FREE USGS MapFinder utility.

• All "z-values" (elevation values) are retained in the polyline.

• For AutoCAD or .dxf files, the file is layered by major and minor contours and intermediate contours

• All lines are continuous polylines (i.e., no broken lines)

Sample Data

Contour.DWG (AutoCAD- 77KB)

Contour.DXF  (123KB)

Contour.SHP  (ESRI- 95KB)

Original Map .TIF (Image- 94KB)

$125 per 7.5 Minute Quad Area. Additional features (water, roads, land grid, etc.) can be purchased at an additional cost.  Contact DDS for details.