Digital Terrain Elevation Data (MIL-D-89020 AMENDMENT 1).

Maps are based on digital terrain elevation data. The program can actually access a resolution of 1, 3, or 30 seconds of an arc, which corresponds to a spacing of approximately 30m, 100m, or 1 km between records. The program can read GTOPO30, GLOBE and DTED level 0 at 30 arc second, SRTM and DTED level 1 at 3 arc second, DTED level 2 and SRTM at 1 arc second, and BIL at any resolution