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How can I detect islands in a contour plot?

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Sean
Sean 2011년 9월 8일
I am trying to detect abnormalities in data with respect to two variables. (Imagine an smoothly varying image where you are trying to detect anomolies/discrepancies).
I can detect these manually by looking for islands in a contour map, but I can't seem to figure out how to algorithmically detect them. In particular, I am looking for a way to detect embedded islands (e.g. islands within islands).
How can I detect the regions where islands occur? Thanks

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Florin Neacsu
Florin Neacsu 2011년 9월 8일
Hello,
If I didn't misunderstood your problem, I believe the Danielsson algorithm for map distance (CGIP, 14:227–248, 1980) could help you.
Regards, Florin

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