[GRASSLIST:2895] Re: unwanted map borders
glynn.clements at virgin.net
Wed Mar 10 13:12:57 EST 2004
Kirk R. Wythers wrote:
> Which command cuts off "clips" unwanted map borders? I have a series of
> scanned and rectified images (essentially tiles) that I intend to use
> r.patch to combine into a single large map. However, there are borders
> around each that needs to be removed before r.patch is applied.
To crop to a rectangular region, use g.region (or d.zoom) to change
the region, then r.resample to create a new map from the portion of
the map inside the current region.
To crop to a non-rectangular region, create a raster map which defines
the region of interest, set it as a mask (with r.mask, or by naming
the map "MASK"), then use r.resample.
Glynn Clements <glynn.clements at virgin.net>
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