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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.

Contour Extraction from DEMs

Before- Original USGS Quad

 

Contour Extraction from DEMs

After- Contour Information Extracted

  • 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)

 

Available Formats

AutoDesk® Software

  • AutoCAD (.dwg)

  • Drawing Exchange File (.dxf)

ESRI® Software

  • ARC/INFO (Coverages, Shapefiles, GeoDatabase, etc.)

  • ArcCAD

  • ArcView

  • PC ARC/INFO

  • Interchange Files (.E00)

Other Common Formats
  • MicroStation®

  • Intergraph®

  • MapInfo®

 

Pricing

$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.

Placing Orders
Call toll-free 1-866-DDS-SCAN (337-7226), or e-mail us at info@usgsquads.com to place an order.  Please include the area of interest by quad name or with latitude/longitude coordinates.  You may also submit request by using our DataFinder application.

Datafinder Get a Quote

 

 

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