[gdal-dev] Converting contour lines (Shape files) into DEM

[Kishore Reddy]

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
r.surf.contour

and some more...

Source: http://grass.osgeo.org/wiki/Contour_lines_to_DEM


--
Kishore



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.
>
> -Chris
>
>
>
>
> --
> Christopher Barker, Ph.D.
> Oceanographer
>
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>
> Chris.Barker at noaa.gov
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