ATOLL 2.8 GLOBAL Digital Terrain Model

[sameh ali]

Atoll document can contain several different geographic data types. Atoll supports a wide range of file formats for geographic data files. The different geographic data types play different roles in the Atoll document:
• Geographic data used in propagation calculation:
- Digital terrain model
- Clutter classes
- Clutter heights
• Geographic data used in dimensioning:
- Traffic maps
• Geographic data used in statistics:
- Population maps
- Custom maps
• Geographic data used for display purposes:
- Scanned maps
- Images from web map services (WMS)
- Contours, lines, and points representing, for example, roads, railways, or regions.

Digital Terrain Model
The DTM describes the elevation of the ground over sea level. You can download GDTM FROM www.gdem.aster.ersdac.or.jp