MIDEM -- DEM Tape to Database Transfer

Reads 16-bit elevation data from a USGS (United States Geological Survey) DEM (Digital Elevation Model) format magnetic tape to a PCIDSK image file. MIDEM reads ASCII format 1-degree (100 m. resolution, 1:250,000 scale) and 7.5-minute (30 m. resolution, 1:24,000 scale) DEM data, but NOT "binary" (unformatted) 1-degree or 7.5-minute DEM data. MIDEM also processes only DEM files with four corners.

Note: MIDEM uses the DEMUNIT and UPLEFT parameters to specify the upper left corner of the PCIDSK file. Information contained in the PCIDSK georeferencing segment is ignored. The PCIDSK pixel size is always assumed to be 30 by 30 metres.