In the profile North-South (Fig. 3a), length 4000 m, the three curves can be divided into three parts: in the left part, the ASTER is lower than DEM95 and TINITALY; in the middle part, the curves of DEM95 and TINITALY fluctuate along that of the ASTER; in the right part, the ASTER is for small sections higher than both DEM95 and TINITALY. This is probably due to the increased geomorphology complexity of the northern profile. ASTER curve has some evident fluctuations, is generally lower than DEM95 and TINITALY, that are relatively close and evidently differ, due to the higher accuracy of these. In the profile West-East (Fig. 3b), length 8800 m, the differences are less marked and the ASTER is generally close to but lower than the others DEMs. From the curves of the different data types for the two profiles, it can be seen that the trend of the DEM95 and TINITALY have similar characteristics.