Remarks:

1) images are comprised of grids e.g. 1x1 km

2) magnitudes (grid colors) are important

3) form/shape of clusters are important

4) maps can be binary

5) python based clustering is favored 

6) we are aware of Dr. Rodger B. Grayson's papers like http://www.sciencedirect.com/science/article/pii/S0309170804001575

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