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Number of sampling pairs

Hello Group!

I've just started using GSTAT, so please excuse my very simple question:

I produced variograms for remote sensing data (gridascii file, size:
128x128, georeferenced, high resolution data 2,5 m) and variograms seem
to be OK (cutoff: 300, interval width: 10), however the number of used
samples is suspiciously high: it starts with 383030 pairs and goes over
5,500,000 which seems hardly possible to me.

Could anyone explain to me, how is the number of samples selected? Can I
change it manually?
Another question: how are the default values of cutoff and interval
width calculated?

Thanks in advance,

Anna Jakomulska



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National Center for Geographic Information and Analysis
University of California, Santa Barbara
Department of Geography
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  Fax: (805) 8938617

http://www.geog.ucsb.edu/
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