USGS Digital Elevation Model (1 degree) (*.dem)

This dataset is often referred to as 3 second arc or 1:250,000 scale USGS DEM data. The data is an ASCII based raster format containing elevation data.

The expected extension is *.DEM. 

This is a memory-based dataset.

Compatibility:

• Cadcorp SIS Desktop
• Cadcorp SIS Desktop Express
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager
• Cadcorp SIS ActiveX Viewer
• Cadcorp GeognoSIS

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