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@@ -1,5 +1,11 @@
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<!-- meta page description: 3D raster data (voxel) processing in GRASS GIS -->
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<!-- meta page index: raster3D -->
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+GRASS GIS is one of the few GIS software packages with volume data support.
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+Here data are stored as a 3D raster with a unit volume called a voxel
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+(volume pixel). Voxels are designed to support representations of
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+trivariate continuous fields.
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+<p>
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+
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GRASS GIS 3D raster maps use the same coordinate system as
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2D raster maps (row count from north to south) with an additional z dimension (depth)
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counting from bottom to top. The upper left corner (NW) is the origin of the voxel.
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@@ -39,6 +45,8 @@ Masks can be set (<a href="r3.mask.html">r3.mask</a>).
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Powerful 3D map algebra is implemented in <a href="r3.mapcalc.html">r3.mapcalc</a>.
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+A 3D groundwater flow model is implemented in <a href="r3.gwflow.html">r3.gwflow</a>.
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+
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<h3>3D raster conversion to vector or 2D raster maps</h3>
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3D vector point data can be converted to a GRASS 3D raster map
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Markus Neteler