[GRASS-user] Creating a ground water from a vector files of
dylan.beaudette at gmail.com
Tue Feb 6 01:48:19 EST 2007
On 2/5/07, Hamish <hamish_nospam at yahoo.com> wrote:
> Bob wrote:
> > Like the subject line says, I need help creating a ground water map
> > using a vector file of contours. The ground water file came from a
> > E00 file that was read into Grass using v.in.e00. I am currently
> > running v.surf.rst which is taking a long time to run. Are there
> > other ways to do this problem?
> g.region res=
> "r.surf.contour - Surface generation program from rasterized contours."
> It works pretty well, but do read the help page for some hints.
> Also from the man page:
> r.surf.contour has not been fully updated for NULL support and still
> considers a value of "0" to be NULL. Thus any contour lines at 0
> elevation (e.g. the coastline) will be ignored. In such cases converting
> any 0 values in the input map to -1 with r.mapcalc may be a suitable
> Currently r.surf.contour will only produce CELL (integer) map output.
> If you would like a finer grade output map (i.e. floating point) it is
> recommended to multiply the input map by 100 (for example) using
> r.mapcalc, then divide the resultant r.surf.contour output map by 100.0,
> again with r.mapcalc.
> Volunteers are sought to remedy both these issues."
> grassuser mailing list
> grassuser at grass.itc.it
not sure how well this would work, but ...
transfer elevation from contour lines to point [z] coordinates
v.surf.rst or other interpolator...
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