I run EXTRACT with the option "All listed summary types". In the tabular output there is a column "Diversity". I didn't find in the documentation how this quantity is calculated and how to interpret the values.
Thanks, Rolf
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Rolf Fankhauser Diversity is used in two other modules: PATTERN and TEXTURE
In PATTERN documentation there is the following definition
b) Diversity H = -sum(p*ln(p))
where sum = the sum over all classes in the entire image
p = proportion of each class in the kernel
ln = natural logarithm
But I think it's not the function applied in EXTRACT because the values there are between 0 and 1 (in case of my output).
I applied EXTRACT on a real image (height above ground = DOM -DEM). So I don't know how the above equation would be applied on a real image.
Rolf
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