Dear Volkmar:
Thank your very much for your help!
I followed your advice to try "Nearest Neighbour" as an interpolation option for image calculator, but it appeared the result was similar to "Trilinear" method. Both of these results were very different from the result that I directly calculated the number of matched subscripts by the mentioned code in my last message. I wonder if you have any idea what might cause this discrepancy?
Thanks!
Yovan
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