Hi Isobel Clark
Thank you for replying
I am not worry for "different sill in differnet
direction". Because I have an anisotropic variogram
model, and want to simulate spatial data from it. Also
I accept second order stationary, and simultate my
data without trend.
My problem is changing "My anisotropic variogram
model" to the "Anisotropic Covariogram", Respected
with it.
In fact I need to specify
C(0) in term of the parameters of my model ( My model
has 6 parameters c01,c02( Nuggets) ,c1,c2 (partial
sill) and a1,a2 (Ranges) ), because when it be known
C(h) = C(0) - g(h)
Sincerely: Webster
--- Isobel Clark <[EMAIL PROTECTED]> wrote:
> Hi
>
> In my limited experience, different sills in
> different
> directions occur for one of the following reasons:
>
> (#) you have not yet reached the total sill in one
> or
> more directions
>
> (#) you have a skewed distribution and are observing
> a
> proportional effect
>
> (#) you have a discontinuity in your study area and
> are crossing it in one or more directions
>
> (#) you are crossing from one population group into
> another in your direction of 'maximum variance' (or
> other similar non-stationary situations)
>
> (#) you may have a trend
>
> In all of these cases the covariance function is
> inappropriate. In most of them, the semi-variogram
> is
> inappropriate.
>
> Isobel Clark
> http://geoecosse.bizland.com/0toKriging.htm
>
>
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