[R-sig-Geo] Spatial interpolation of river network observations

[Tomislav Hengl]

Hi Ultrich,

Facundo Muñoz apparently made a GRASS function to derive distances along streams:

https://stat.ethz.ch/pipermail/r-sig-geo/2009-November/006851.html 

17 observations only? That is really tight for any geostatistical analysis (on top, you want to do 3
dimensions!). I would instead consider fitting a smooth surface (splines) / simulating the flow
processes.


all the best,

T. Hengl
http://home.medewerker.uva.nl/t.hengl/ 

> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf
> Of Ulrich Leopold
> Sent: Tuesday, November 17, 2009 10:53 AM
> To: R-sig-geo list; grass-user at lists.osgeo.org
> Subject: [R-sig-Geo] Spatial interpolation of river network observations
> 
> 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?
> 
> Attached is a file which shows the sampling locations and the storage lake.
> 
> Thanks very much.
> 
> Best regards,
> Ulrich
> 
> 
> --
> ______________________________________________________________________
> 
> Ulrich Leopold
> 
> Resource Centre for Environmental Technologies, Public Research Centre
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