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A question received via email: I used the oft-cluster.bash and oft-clump on two sets of images: 1973 and 2014. The results for 1973 did not look good. For 2014, the results were superb except for one thing. The very tiny polygons. How to remove them? |
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There are at least two nice ways to accomplish this. First, you can use oft-seg, pass the output of the oft-clump to the program using the -um option and give a desired minimum size in pixels. Second, you can use the gdal_sieve.py. The difference between the two is that whereas oft-seg merges the small segments with the most similar neighboring segment gdal_sieve.py merges them with the largest neighboring polygon. |