Topic: null data

       r.null                                                       Manages NULL-values of given raster map.

       r3.null                                                      Explicitly create the 3D NULL-value bitmap file.

       See also the corresponding keyword null data for additional references.

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual

GRASS 7.4.0                                                                              topic_null_data(1grass)