DEM scripts

This page details and explains the use of the DEM creation scripts:

lidardem.sh
asterdem.sh
nextmapdem.sh
lidar_aster_dem.sh

The scripts listed are written in bash.

These scripts are used to create a DEM from LiDAR and elevation model tiles. The scripts use grass GIS to read in the elevation tiles and perform patching and various other operations on the data to create a DEM. GRASS is a GIS (Geograohic Information System) and details of it can be found at: ​http://grass.fbk.eu/. There is a detailed api and usage guide, it is available for free download at: ​http://grass.fbk.eu/download/index.php.

Creating a DEM from ASTER data using asterdem.sh script

ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) is a sensor on the Terra satellite, ASTER is partly being used to obtain elevation maps. The ASTER version 1 have an approximate resolution of 30 metres, version 2 however has an approximate resolution of 15 metres.