Some sort of predictor/corrector algorithm likely exploiting high-resolution data that would otherwise be classified is my guess. See Kalman Filters for such a

Some sort of predictor/corrector algorithm likely exploiting high-resolution data that would otherwise be classified is my guess. See Kalman Filters for such a thing... http://en.wikipedia.org/wiki/Kalman_filter http://en.wikipedia.org/wiki/Kalman_filter