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Automated procedures for photogrammetric image processing and Digital Elevation Models (DEM) extraction&#13; yield high precision terrain models in a short time, reducing manual editing; their accuracy is strictly related to&#13; image quality and terrain features. After an analysis of the performance of the Digital Photogrammetric Workstation&#13; (DPW) 770 Helava, the paper compares DEMs derived from different surveys and registered in the same&#13; reference system. In the case of stable area, the distribution of height residuals, their mean and standard deviation&#13; values, indicate that the theoretical accuracy is achievable automatically when terrain is characterized by&#13; regular morphology. Steep slopes, corrugated surfaces, vegetation and shadows can degrade results even if manual&#13; editing procedures are applied. The comparison of multi-temporal DEMs on unstable areas allows the monitoring&#13; of surface deformation and morphological changes

Automated DEM extraction in digital aerial photogrammetry: precisions and validation for mass movement monitoring