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GRASS GIS 6.4.svn 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

raster3D commands:
r3.cross.rast Creates cross section 2D raster map from 3d raster map based on 2D elevation map
r3.gwflow Numerical calculation program for transient, confined groundwater flow in three dimensions Convert a 3D ASCII raster text file into a (binary) 3D raster map layer import of 3-dimensional Vis5D files (i.e. the v5d file with 1 variable and 1 time step) Outputs basic information about a user-specified 3D raster map layer.
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 map to 3-dimensional Vis5D file.
r3.out.vtk Converts 3D raster maps (G3D) into the VTK-Ascii format
r3.stats Generates volume statistics for raster3d maps.
r3.timestamp Print/add/remove a timestamp for a 3D raster map Converts 3D raster maps to 2D raster maps
r3.univar Calculates univariate statistics from the non-null 3d cells of a raster3d map.

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