Date: Wed, 08 Oct 2008 11:24:46 +0200
To: enayat khojasteh <[EMAIL PROTECTED]>
From: seba <[EMAIL PROTECTED]>
Subject: Re: AI-GEOSTATS: Coordinate transformation
Hi
Well, in my opinion your transformation is meaningful if effectively
the spatial variability along
the vertical direction (i.e. the normal to layering) is proportional
to the thickness (i.e. the layering becomes
denser where the overall thickness is smaller). If it is not the
case it could be enough to do a transformation
considering the centerline (or better center plane!) between the
upper and lower surfaces as reference plane.
Bye
Sebastiano
At 09.34 08/10/2008, you wrote:
Dear Mrs. Clark and other friends,
Related to Figen's question about rescaling, I also would like to
know your opinion about a case where we transform our stratigraphic
coordinates e.g. proportional to the upper and lower surfaces of
our modeling volume.
In this case from x,y, and z coordinates the z coordinate would
be changed to zrel (relative grid), i.e. would we divide the
thickness of a layer to the same grid numbers.
It seems that this transformation causes the stationrity and the
total shape of (sample) variogram to be altered and e.g. show
something like no-stationary variogrmas or difficult to interpret
variogrmas. Do you think that, such transformation as C.V. Deutsch
has mentioned is good and reliable? (my special case is dealing
with categorical variables and indicator variograms).
Thanks in advance.
Best Wishes
Enayat
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