Also terrain aspect was found to have a relative infuence on the magnitude of errors in the DEMs. The highest magnitude of errors was observed for measurements made on ASTER, the lowest magnitude of errors was observed in TINITALY. The error magnitude did not vary considerably with aspect in DEM95 and ASTER, while in TINITALY an irregular shape of the error was observed, with the lowest errors on slopes facing south (S), southeast (SE) and west (W), due to the better accuracy, while DEM95 did not show trends. In this case aspect did not particularly infuenced the absolute mean error