Re: AI-GEOSTATS: Area estimation
- Hi Donald. According to the *transitive* theory of geostatistics, it is
possible to estimate (to have an estimate and the error variance of) the
total area of a regionalized variable without specifying a priori any
area/volume, using the indicator transform. I think you are referring to
*intrinsic* geostatistics (the model-based version of the theory) in which
it is as you say: only a fraction of a pre-specified area/volume can be
estimated, though the pre-specified area/volume would not have an
associated error variance. I was asking geostatisticians in the list if
they have used transitive geostatistics for total area estimation. I'd add
now what software have they used to do transitive geostatistics for total
area estimation, if they had.
>Donald E. Myers wrote:different question.? Kriging does not "estimate the area of a regionalized
>I wonder if you need to clarify your question or whether you want to ask a
variable". You can use "block" kriging to estimate the average value of a
regionalized variable over a specified area or volume. By combining an
indicator transform with block kriging you can estimate the proportion of
an area/volume where the regionalized variable is above/below a specified
cutoff. Because tht indicator transform makes it look essentially like
"presence/absence" it is close
to the idea of estimating an area but only as a fraction of a specified
>>Ruben Roa wrote:Colleagues:
Has anyone used transitive geostatistics to estimate the area of a
regionalized variable? Any references apart from Matheron's lecture notes,
i mean, applications?
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