Author: GRASS Development Team

## GRASS GIS 6.2.3 Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS, is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.

This reference manual details the use of modules distributed with Geographic Resources Analysis Support System (GRASS), an open source (GNU GPL'ed), image processing and geographic information system (GIS).

### Quick Introduction

- GRASS startup manual page
- How to start with GRASS
- Introductions
  - 2D raster map processing
  - 3D raster map (voxel) processing
  - Image processing
  - Database management
  - Vector map processing and network analysis
  - Projections and spatial transformations
  - SQL support
  - Display drivers
  - GRASS variables and environment variables
- The GRASS Extensions Manager (GEM)

raster3D commands:

r3.cross.rast | Creates cross section 2D raster map from g3d raster volume map based on 2D elevation map
r3.in.ascii | Convert a 3D ASCII raster text file into a (binary) 3D raster map layer
r3.in.v5d | import of 3-dimensional Vis5D files (i.e. the v5d file with 1 variable and 1 time step)
r3.info | Outputs basic information about a user-specified 3D raster map layer.
r3.mapcalc |
r3.mapcalculator | r3.mapcalculator - Calculates new grid3D volume from r3.mapcalc expression
r3.mask | Establishes the current working 3D raster mask.
r3.mkdspf | Creates a display file from an existing grid3 file according to specified threshold levels.
r3.null | Explicitly create the 3D NULL-value bitmap file.
r3.out.ascii | Converts a 3D raster map layer into an ASCII text file
r3.out.v5d | Export of GRASS 3D raster file to 3-dimensional Vis5D file.
r3.out.vtk | Converts 3D raster maps (G3D) into the VTK-Ascii format
r3.timestamp | print/add/remove a timestamp for a 3D raster map
r3.to.rast | Converts 3D raster maps to 2D raster maps

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© 2003-2007 GRASS Development Team