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First Results on Accuracy Analysis for DEM and Orthoimages Cerived from SPOT HRS Stereo Data over Bavaria

Reinartz, Peter and Lehner, Manfred and Müller, Rupert and Rentsch, Matthias and Schroeder, Manfred (2003) First Results on Accuracy Analysis for DEM and Orthoimages Cerived from SPOT HRS Stereo Data over Bavaria. In: High Resolution and Mapping from Space 2003, CD-ROM-. ISPRS Workshop: High Resolution and Mapping from Space 2003, Hannover, 6.-8. Oct. 2003.

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Abstract

ISPRS and CNES announced the HRS (High Resolution Stereo) Assessment Program during the ISPRS Commission I Symposium in Denver in November 2002. 9 test areas throughout the world have been selected for this program. One of the test sites is located in Bavaria, Germany, for which the PI comes from DLR. The goal is to derive a DEM from the along-track stereo data of the SPOT HRS sensor and to assess the accuracy by comparison with ground control points and DEM data of superior quality. For the derivation of the DEM, the DLR own stereo processing software, developed for the MOMS-2P three line stereo camera is used. As a first step, the interior and exterior orientation of the camera, delivered as ancillary data (DORIS and ULS), which should lead to an absolute orientation accuracy of about 30 meters, are extracted. No bundle block adjustment with ground control is used in the first step. A dense image matching, using every pixel as a kernel center, provides parallaxes for every pixel. The quality of the matching is controlled by forward- and backward matching of the two stereo partners using the local least squares matching method. Forward intersection leads to points in object space which are then interpolated to a regular DEM of the region in a 20 meter grid. As a second step, orthoimages are generated from the images of the two looking directions, using the derived DEM. The orthoimage and DEM accuracy is determined by using the ground control points and the available DEM data of superior resolution (DEM derived from laser data). As the original image data were received with delay by mid of July 2003 only very preliminary results can be given in this paper.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2003,
Title:First Results on Accuracy Analysis for DEM and Orthoimages Cerived from SPOT HRS Stereo Data over Bavaria
Authors:
AuthorsInstitution or Email of Authors
Reinartz, PeterUNSPECIFIED
Lehner, ManfredUNSPECIFIED
Müller, RupertUNSPECIFIED
Rentsch, MatthiasUNSPECIFIED
Schroeder, ManfredUNSPECIFIED
Date:2003
Journal or Publication Title:High Resolution and Mapping from Space 2003
Page Range:CD-ROM-
Editors:
EditorsEmail
Universität Hannover, UNSPECIFIED
Series Name:IAPRS
Status:Published
Keywords:Digital elevation models, SPOT HRS, along track stereo, image matching, orthoimage
Event Title:ISPRS Workshop: High Resolution and Mapping from Space 2003, Hannover, 6.-8. Oct. 2003
Organizer:IPI, Universität Hannover
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Cornelia Roehl
Deposited On:06 Feb 2006
Last Modified:06 Jan 2010 22:17

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