USGS GTOPO30 (*.hdr;*.dem)

This is a binary format file containing point height readings at 30 arc second intervals (approx 1000m).

The expected file extension of this data is *.HDR and *.DEM.

Compatibility:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS Map Manager
• Cadcorp SIS Map Express
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager
• Cadcorp SIS ActiveX Viewer
• Cadcorp GeognoSIS

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