> A graph of semivariogram
> gamma(h)
> | .
> | .
> | . .
> | . .
> | . . .
> | . . .
> | . ..
> | .
> | .
> | . . . .
> | . . .
> |_________________________________________ h
^
Waghei
If this is an omni-directional semi-variogram, then
what you have is a severe case of anisotropy probably
complicated by a strong trend.
I would hazard a guess that you start to runout of
pairs of samples in one or more directions somewhere
around the ^ above.
Try constructing directional semi-variograms and
post-plotting the data to identify directional
differences.
Isobel Clark
http://uk.geocities.com/drisobelclark
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