[gdal-dev] Converting contour lines (Shape files) into DEM
enigma2006.kishore at gmail.com
Mon Mar 29 12:41:15 EDT 2010
Yeah, GRASS got methods to convert contour lines to DEM formats but I
am not that much literate to compare.
It got some commands like
r.surf.idw = Inverse distance weighted method using the n-closest data points
r.surf.nnbathy = Natural-Neighbor interpolation
and some more...
On Mon, Mar 29, 2010 at 9:58 PM, Christopher Barker
<Chris.Barker at noaa.gov> wrote:
> Even Rouault wrote:
>> 2) Use gdal_rasterize to burn the contour lines.
>> See http://gdal.org/gdal_rasterize.html
>> 3) Fill the holes (the nodata values) with gdal_fillnodata.py.
>> See http://gdal.org/gdal_fillnodata.html
>> Now, the result should be usable with gdaldem.
> well, yes, but it's likely to be pretty ugly -- it will represent the
> elevation as steps -- constant values between contours. If you have enough
> contour lines, and want a low-resolution DEM, that might be OK. However,
> you'll get much prettier results if you interpolate in some way to get a
> smoother result.
> Unfortunately, interpolating contour lines well is not trivial -- I'd do
> some googling and see what you can find.
> GRASS may have something to help you here, too.
> Christopher Barker, Ph.D.
> Emergency Response Division
> NOAA/NOS/OR&R (206) 526-6959 voice
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