# GRASS Help System

## TERRAIN ANALYSIS

Elevation data are crucial to any GIS. A number of GRASS commands were designed specifically to address terrain analysis issues related to water movement, development of ballistic trajectories, and computation of slope and aspect.

Although the GRASS commands listed below were designed to analyze terrain data, they can be used to analyze any data types.

- r.basins.fill - r.slope.aspect
- r.cost - r.traj
- r.drain - r.volume
- r.los - r.watershed
- r.surf.contour - r.surf.idw
- r.surf.idw2 - d.rast.arrow

For more information on a specific command, select a command and press ESC.

See also: d.3d, r.mapcalc, r.clump and the paper "r.mapcalc: An Algebra for GIS and Image Processing".

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Automatically created on: Thu Oct 14 02:12:26 2004