[GRASS5] r.contour bug with NULL data

Markus Neteler neteler at geog.uni-hannover.de
Mon Jan 15 07:58:11 EST 2001

Hi Justin,

On Mon, Jan 15, 2001 at 07:12:48PM +0700, Justin Hickey wrote:
> Hi Markus
> Markus Neteler wrote:
> > 
> > Hi all,
> > 
> > r.contour obviously fails if "no data" sections are
> > within a raster map:
> > 
> > r.contour -q in=dgm12.5 step=10 out=contour10
> > Error, 1 crossings in Cell 185, 157
> > Error, 1 crossings in Cell 188, 160
> > 
> > Help would be appreciated (or shall I put into RT?)
> Speaking of "no data" sections of raster maps, a few years ago I wrote a
> module called r.fill.null that scanned raster maps for "holes" in the
> data. If it found any, it would average the surrounding cell values to
> fill the hole using a 3x3 neighborhood. THis only works on small holes
> but it did give us completely filled surfaces.
> Do you think there is enough interest to add this to Grass?

Definitely! I was searching for such a tool recently to fill holes in
raster maps. Perhaps you tool could be taught to fill any hole size?
Or one has to run it several times..



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