1. A system comprising: an aerial image database containing sensor data representing a plurality of aerial images of an area having multiple sub-areas; a processor applying a classifier to the sensor values to identify a label for each sub-area in each aerial image and to thereby generate an initial label sequence for each sub-area; the processor identifying a most likely land cover state for each sub-area based on the initial label sequence, a confusion matrix and a transition matrix; and for each sub-area, the processor storing the most likely land cover state sequence for the sub-area.