In order to perform a thorough quantitative analysis of the morphology of an area, a methodology has been developed, able to deal with a Digital Elevation Model (DEM), that classifies the DEM pixels starting from the eight topographical gradients, computed as differences between each pixel and the eight surrounding ones, and provides for each class a complete set of statistics of terrain attributes, including elevation, slope, and aspect. In addition, a thematic colour map may be built, with hue and saturation attributed according to both mean aspect and slope of each class, respectively. As an example, Mount Soratte in Italy has been analysed in two different ways