This code calculate the change direction from two probability images. Not
intended to be called directly - see
time 1 posterior probability matrix (with pixels in rows, bands in columns)
time 2 posterior probability matrix (with pixels in rows, bands in columns)
vector of change directions
Chen, J., P. Gong, C. He, R. Pu, and P. Shi. 2003. Land-use/land-cover change detection using improved change-vector analysis. Photogrammetric Engineering and Remote Sensing 69:369-380.
Chen, J., X. Chen, X. Cui, and J. Chen. 2011. Change vector analysis in posterior probability space: a new method for land cover change detection. IEEE Geoscience and Remote Sensing Letters 8:317-321.
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