[Freegis-list] SRTM to contourlines

[Frank Warmerdam]

On Wed, 16 Feb 2005 18:35:03 +0100, Martin Vigerske <martin at vigerske.de> wrote:
> Hi,
> 
> I am looking for a free tool to convert SRTM-Data (a GeoTiff from GLCF)
> to contourlines (as dxf or an other vector-format).
> 
> I tried GRASS, but couldn't manage it yet.
> 
> Maybe there is a free tool out there?

Martin,

You can use the gdal_contour command from GDAL to accomplish this. 
The main downside of the gdal_contour command is that it produces 
very dense contours (1 line segment for each pixel crossed by the contour).

It can be found as part of the pre-build FWTools suite if you wish. 

  http://fwtools.maptools.org/

Details on gdal_contour can be found at:

  http://www.gdal.org/gdal_utilities.html#gdal_contour

I would add that gdal_contour products contours in any GDAL/OGR writable
vector format, which does not include DXF.  The default output is Shapefiles. 

Best regards,
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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