I read one interesting paper from the following url: http://www.sciencedirect.com/science/article/pii/S0034425711003427

And I have an interest in technically reproducing Figure 18 in the paper. I attached the paragraph that explains the algorithm, however I could not reproduce the same figure for my study area.

Should I extract the pixel value of "urban" and convert into xyz table first? Then convert into MS. Excel to produce the graph?

Any technical assistance is welcome and really appreciated.

Thank you.

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