[GRASS-user] r.contour fails to close a contour at the region's border

GRASS GRASS user
1

This is a re-post.

I have automatically generated raster data from which I create a contour using r.contour. Sometimes the “feature” to be contoured is not completely contained within the specified region. When this happens, r.contour generates an open contour - basically the beginning line segment point does not equal the ending line segment point.

Is there a way to get r.contour to close the contour at the region’s border?

If not, is there an easy way to close the contour?

Thanks

John Ciolek
Sr. Atmospheric Scientist
AlphaTRAC, Inc.

2

On Fri, Jan 3, 2014 at 12:48 AM, John Ciolek <jciolek@alphatrac.com> wrote:

This is a re-post.

I have automatically generated raster data from which I create a contour
using r.contour. Sometimes the "feature" to be contoured is not completely
contained within the specified region. When this happens, r.contour
generates an open contour - basically the beginning line segment point does
not equal the ending line segment point.

Could you please send a small screenshot (to me) or put it somewhere?

Is there a way to get r.contour to close the contour at the region's border?

If not, is there an easy way to close the contour?

Would it be feasible to work with a slightly larger region?
Note that g.region supports syntax like (say, relative coordinates):

g.region w=w-1000 e=e+1000 n=n+2000 s=s-2000

Best
Markus