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Title: Automating the checking and correcting of dems without reference data
Authors: Skarlatos, Dimitrios 
Georgopoulos, A. 
Keywords: Algorithms;Automation;Correction;DEM/DTM;Geometric;Orthorectification;Quality;Reference data
Category: Civil Engineering
Field: Engineering and Technology
Issue Date: 1-Jan-2004
Source: 20th ISPRS Congress on Technical Commission VII, Istanbul, Turkey, 12 July 2004 through 23 July 2004
Conference: ISPRS Congress on Technical Commission VII 
Abstract: © 2004 International Society for Photogrammetry and Remote Sensing. All rights reserved. The need for Digital Elevation Model (DEM) checking has raised since the automated matching techniques emerged. The use of reference data is a luxury and therefore cannot be used in all cases. This article presents a completely new mathematical model, which translates discrepancies between two orthophotographs created from different photographs, into precise corrections of the DEM. These corrections are the differences from the real surface and, if applied over the existing DEM, can produce a more accurate one. The mathematical model is straightforward, does not approximate, and therefore there is no need for iterations. In order to test the algorithm a reference DEM has been manually collected and distorted with a known pattern. The corrections produced by the algorithm follow the known pattern. Tests over automatically created DEMs by commercial software has also been made and compared against the reference DTM. Obvious applications include checking of automatically created DEMs, refinement of existing DEMs using aerial photographs and update of orthophotographs based on the previous DEM and new imagery.
Description: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, Volume 35, 2004
ISSN: 16821750
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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