Detrending is a pretty basic practice in geostatistics. I think you should do some more reading before you plunge into analyses.
Dan Bebber > -----Original Message----- > From: Jose Luis Gomez Dans [mailto:[EMAIL PROTECTED] > Sent: 03 November 2004 17:01 > To: Dan Bebber > Subject: Re: [ai-geostats] Understanding variograms > > > Dan and Isobel, > Many thanks for your prompt reply! > > On Wednesday 03 Nov 2004 16:39, you wrote: > > It probably means that you have a spatial trend in > your data. > > Remove any trend, then try again. > > OK, my data are point heights above the geoid over a > large area. While > there could well be a trend, how would I go > de-trending the data? I > have a digital elevation model of this region, and I > guess I could > subtract the grid value for each point considered, and > that should get > rid of things like slope effects (in effect, a > linear-ish trend). > > Does this make any sense? > > Many thanks > Jose > > -- > Jose L Gomez-Dans, Research Assistant > Bristol Glaciology Centre, Geographical Sciences/CPOM > University of Bristol, Bristol, UK > > > > > > > ___________________________________________________________ALL-NEW > Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com
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