At 01:03 PM 6/7/01 +0200, Markus Boehm wrote:
>Dear all,
>
>how should soil data (~3300 profiles, ~150m average horizontal distance,
>all about 1 meter deep with different thickness of horizons representing
>type of soil, humus contents, ...) be kriged?
>
>I need all information of the different horizons to calculate the somewhat
>like ground water infiltration rate.
>
>Does it make sense to use 3D-kriging methods? I think then there should a
>modification of the z-coordinate be made. I mean stretching of the
>z-coordinate. Does anyone know how to deal with the problem or some useful
>textbook?
>
>Or would you prefer to do 2D-kriging for a number of depths (10cm,
>20cm,...), so there's no need to modify the z-coordinate?
>
>
>Regards,
>Markus
I would compute a vertical or "downhole" variogram to see if there if any
significant spatial correlation in that direction. If so, you should
attempt to use a 3D kriging method, as it would be wasteful not to use that
information. You will have to use a very high value for anisotropy in the
Z direction (on the order of 1000 probably) or else leave the depth units
as cm and the horizontal units in m.
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