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raster3dintro manual: cosmetics

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@61349 15284696-431f-4ddb-bdfa-cd5b030d7da7
Markus Neteler 10 years ago
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 <!-- meta page description: 3D raster data (voxel) processing in GRASS GIS -->
 <!-- meta page description: 3D raster data (voxel) processing in GRASS GIS -->
 <!-- meta page index: raster3D -->
 <!-- meta page index: raster3D -->
+<h3>3D Raster maps (voxels) in general</h3>
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 GRASS GIS is one of the few GIS software packages with volume data support.
 GRASS GIS is one of the few GIS software packages with volume data support.
 Here data are stored as a 3D raster with a unit volume called a voxel
 Here data are stored as a 3D raster with a unit volume called a voxel
 (volume pixel). Voxels are designed to support representations of
 (volume pixel). Voxels are designed to support representations of