[GRASS-user] Re: Spatial interpolation of river network observations

GRASS GRASS user
1

Hi Ulrich,

AFAIK the algorithm to calculate the hydrological distance is actually r.stream.distance.

Hope this helps

Margherita

Date: Tue, 17 Nov 2009 10:52:45 +0100 From: Ulrich Leopold <Ulrich.Leopold@Tudor.lu> Subject: [GRASS-user] Spatial interpolation of river network observations To: R-sig-geo list <r-sig-geo@stat.math.ethz.ch>, grass-user@lists.osgeo.org Message-ID: <4B02726D.4050002@Tudor.lu> Content-Type: text/plain; charset="iso-8859-1"

Dear all,

I would like to interpolate 17 pollution observations in a storage lake in 3 dimensions (x,y,z).

As I understand variogram analysis and kriging are not straightforward as we are dealing with non-euclidean (hydrologic) distances and down-stream direction.

Could someone point me to some algorithms which can roughly estimate the 3d pollution body accounting for hydrologic distances?

--
Eng. Margherita Di Leo
Ph.D. Candidate
Methods and Technologies for Environmental Monitoring
Department of Environmental Engineering and Physics (DIFA)

University of Basilicata Campus Macchia Romana
85100 - Potenza Italy

Office: +39-0971205363
Fax: +39-0971205160

2

I recall Hamish once released an interpolate with barriers code that I
believe it's in the addons.

Never used it myself but you should take a look
http://lists.osgeo.org/pipermail/grass-user/2008-February/043541.html

The screenshot is very neet and looks like what you want to do. Just
don't know about the 3d interpolation though. I think it's just 2d....
http://grass.osgeo.org/wiki/File:Inlets_03_SurfSal_icw_big.png

Cheers
Daniel

On Tue, Nov 17, 2009 at 8:28 AM, Margherita Di Leo <diregola@gmail.com> wrote:

Hi Ulrich,

AFAIK the algorithm to calculate the hydrological distance is actually
r.stream.distance.

Hope this helps

Margherita

Date: Tue, 17 Nov 2009 10:52:45 +0100 From: Ulrich Leopold
<Ulrich.Leopold@Tudor.lu> Subject: [GRASS-user] Spatial interpolation of
river network observations To: R-sig-geo list <r-sig-geo@stat.math.ethz.ch>,
grass-user@lists.osgeo.org Message-ID: <4B02726D.4050002@Tudor.lu>
Content-Type: text/plain; charset="iso-8859-1"

Dear all,

I would like to interpolate 17 pollution observations in a storage lake in 3
dimensions (x,y,z).

As I understand variogram analysis and kriging are not straightforward as we
are dealing with non-euclidean (hydrologic) distances and down-stream
direction.

Could someone point me to some algorithms which can roughly estimate the 3d
pollution body accounting for hydrologic distances?

--
Eng. Margherita Di Leo
Ph.D. Candidate
Methods and Technologies for Environmental Monitoring
Department of Environmental Engineering and Physics (DIFA)

University of Basilicata Campus Macchia Romana
85100 - Potenza Italy

Office: +39-0971205363
Fax: +39-0971205160

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