[GRASS-user] Building areas out of contour lines

GRASS GRASS user
1

Hello,

I have got a SRTM tile and I built the contour lines with r.contour
then I tried e.g. r.surf.contour or to export closed polygons, but I am not confident with the results..

I am looking for a hint to find an efficient way to extract the areas between contour lines which have no boundaries...(?)

perhaps just adding boundaries could be a solution and export closed polygons after this... (?) - closing them by hand takes too much time. Perhaps there is a command to add boundaries to a given region.

thanks..

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2

On Wed, Feb 3, 2010 at 11:55 AM, "Kilian Schönberger" <KiSchoe@gmx.de> wrote:

Hello,

I have got a SRTM tile and I built the contour lines with r.contour
then I tried e.g. r.surf.contour or to export closed polygons, but I am not confident with the results..

I am looking for a hint to find an efficient way to extract the areas between contour lines which have no boundaries...(?)

You mean to interpolate the pixels between the contour lines
(so: from vector contours to raster map) or to insert additional
contour lines?

If you want to do the former (interpolation), take a look at
http://grass.osgeo.org/grass64/manuals/html64_user/v.surf.rst.html
The notes contain hints for contour lines.

Markus

3

Markus wrote:

If you want to do the former (interpolation), take a look at
http://grass.osgeo.org/grass64/manuals/html64_user/v.surf.rst.html
The notes contain hints for contour lines.

(r.surf.contour does a beautiful job too, just read the help page
carefully)

Hamish