[GRASS-user] Fixing Collared DRGs

[Tom Russo]

On Wed, Apr 02, 2008 at 12:51:35PM -0700, we recorded a bogon-computron collision of the <Craig at pid.co.za> flavor, containing:
> 
> 
> Tom Russo wrote:
> > 
> > ...
> >   v.to.rast input=o48112d2_bounds output=o48112d2_bounds use=val value=1
> >      (this one generates a raster that's 1 inside the neatline, null
> > outside)
> >   echo
> > "o48112d2_withoutcollar=if(!isnull(o48112d2_bounds),o48112d2_withcollar,null())"
> > | r.mapcalc
> >     (this populates the _withoutcollar map only where the mask is
> > non-null)
> >     (you could also do it with 
> >         r.mask input=o48112d2_bounds
> >         echo "o48112d2_withoutcollar=o48112d2_withcollar"| r.mapcalc
> >         r.mask -r
> >     )
> > ...
> > 
> 
> Hi
> 
> Another way is to use gdal_rasterize. See point e) under the Mosaicing
> section of this tutorial by Frank Warmerdam:
> 
> http://trac.osgeo.org/gdal/wiki/UserDocs/RasterProcTutorial

Neat.  The same 24kgrid shapefile could be the source of the vector clipping
region for that technique, too.  Thanks for pointing that out, I hardly
ever use gdal_rasterize and didn't know it could do that.

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
 one trick, rational thinking, but when you're good and crazy, oooh, oooh,
 oooh, the sky is the limit!"  --- The Tick