Constrained Distance based K Means Clustering for Satellite Image Time Series
The advent of high resolution instruments for time series sampling poses added complexity for the formal definition of thematic classes in the remote sensing domain required by supervised methods while unsupervised methods ignore expert knowledge and intuition. Constrained clustering is becoming an increasingly popular approach in data mining because it offers a solution to these problems, however, its application in remote sensing is relatively unknown. This article addresses this divide by adapting publicly available k Means constrained clustering implementations to use the dynamic time warping (DTW) dissimilarity measure, which is thought to be more appropriate for time series analysis. Adding constraints to the clustering problem increases accuracy when compared to unconstrained clustering. The output of such algorithms are homogeneous in spatially defined regions.
IGARSS 2019 2019 IEEE International Geoscience and Remote Sensing Symposium