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Authors: Fabris, M.* 
Pesci, A.* 
Title: Automated DEM extraction in digital aerial photogrammetry: precisions and validation for mass movement monitoring
Issue Date: Dec-2005
Series/Report no.: 6/48 (2005)
Keywords: digital photogrammetry
automatic processing
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods 
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous 
Abstract: Automated procedures for photogrammetric image processing and Digital Elevation Models (DEM) extraction yield high precision terrain models in a short time, reducing manual editing; their accuracy is strictly related to image quality and terrain features. After an analysis of the performance of the Digital Photogrammetric Workstation (DPW) 770 Helava, the paper compares DEMs derived from different surveys and registered in the same reference system. In the case of stable area, the distribution of height residuals, their mean and standard deviation values, indicate that the theoretical accuracy is achievable automatically when terrain is characterized by regular morphology. Steep slopes, corrugated surfaces, vegetation and shadows can degrade results even if manual editing procedures are applied. The comparison of multi-temporal DEMs on unstable areas allows the monitoring of surface deformation and morphological changes.
Appears in Collections:Annals of Geophysics

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