Provided by: grass-doc_7.0.3-1build1_all 

Topic: null data
Note: see also the corresponding keyword null data for additional references.
r.null Manages NULL-values of given raster map.
r3.null Explicitly create the 3D NULL-value bitmap file.
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© 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual
GRASS 7.0.3 topic_null_data(1grass)