Geographical information system ; Geotechnics ; Italy ; Land use ; Landslide ; Marche (Italy) ; Model ; Multivariate analysis ; Natural hazards ; Spatial distribution ; Statistics ; Umbria
over test areas in Central Italy, ranging in size from some tens to some thousands of square kilometers, and outline the potentials and pitfalls of the approach. In the light of the results obtained, data quality, type of terrain-unit and statistical
(tabulated classification); and 2) each exposure was classified according to the dominant weathering grade (visual classification). Mean and median joint spacings and joint spacing frequency distributions were analyzed and compared statistically for each