[R-sig-Geo] FW: Incorporating boundaries into kriging

[Alex Lechner]

Thanks for the help.

I am in the process of including a trend with distance to the pond.

Alex

-----Original Message-----
From: Edzer Pebesma [mailto:edzer.pebesma at uni-muenster.de] 
Sent: Monday, 7 February 2011 5:23 PM
To: r-sig-geo at r-project.org
Subject: Re: [R-sig-Geo] Incorporating boundaries into kriging



On 02/07/2011 03:58 AM, Alex Lechner wrote:
> Hi,
> 
> I have a number of point measurements of soil electrical conductivity surrounding a large pond (see http://www.flickr.com/photos/32778961@N04/5423900854/  ) which I am trying to create a kriged surface for. Is there any way of excluding distances across the pond in the variogram calculations (see http://www.flickr.com/photos/32778961@N04/5423901056/ ).
> 
I guess with a lot of work -- using package rgeos, check every point
pair whether the line connecting them crosses the pond, then exclude
these pairs from the variogram cloud and bin them.

I'm not sure how much it would help you. You'd not be the first if in a
next step you'd like to krige and exclude points that cross the pond --
an action that can lead to very weird interpolation surfaces, because
points suddenly appear "visible" when turning around a corner.

Have you tried including a trend with distance to the pond?

> Thanks,
> 
> Alex Lechner
> 
> Research Fellow
> Centre for Mined Land Rehabilitation
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de