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Unsupervised classification: ISODATA (Iterative self-organising data

Unsupervised classification: ISODATA (Iterative self-organising data analysis) algorithm. Same as K-means but now we can vary number of clusters (by splitting / merging) Start with (user-defined number) randomly located clusters Assign each pixel to nearest cluster (mean spectral distance) Re-calculate cluster means and standard deviations If distance between two clusters < some threshold, merge them If standard deviation in any one dimension > some threshold, split into two clusters Delete clusters with small number of pixels Re-assign pixels, re-calculate cluster statistics etc. until changes of clusters < some fixed threshold. 25.

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