Variance-covariance matrix

The Variance-Covariance operation calculates variances and covariances of raster maps in a map list. The variance is a means to express the variation of pixel values within a single raster map, i.e. a measure of the variation to the mean of the DN (Digital Number) values in a raster map. The covariance is a measure to express the variation of pixel values in two raster maps. It denotes the joint variation to the common mean of pixel values of the maps. Furthermore, the mean and standard deviation of each individual raster map is calculated.