> How to interpolate the vector data set to generate a raster
> data set representing the elevation information?
>
s.surf.tps offers the most control over such interpolations. Use v.to.rast to
convert your contour lines to raster at an appropriate resolution (20m ?), then
use r.stats -1zg input=raster_file_name | s.in.ascii sites=new_sitesfile_name .
We found it helpful to thin out the raster data a little with r.random; we ended
up using 30% of the original raster cells to get good results. The unused cells
can be used to check the interpolated output.
I agree that s.surf.tps is a good tool for converting contours to
raster elevation data, but why use v.to.rast at all?
We used v.to.sites to convert our contours to site lists and used
that as an input to s.surf.tps. If you want to reduce the number of
points, use either v.purge on the contour vector data or
use the dmin option to s.surf.tps (we did both)
Martin
--
Martin Ameskamp, Inst. f. Informatik I (Computing Dept.)
Kiel University, Olshausenstr. 40, 24118 Kiel, Germany
Fax: ++49 431 8804054, Voice: ++49 431 8804474,
email: ma@informatik.uni-kiel.d400.de