Stereo Evaluation of ALOS/PRISM Data on ESA-AO Test Sites – First DLR Results

Mathias Schneider(1), Manfred Lehner(1), Rupert Müller(1) and Peter Reinartz(1)

(1) German Aerospace Center (DLR), Münchner Str. 20, 82334 Wessling, Germany


Stereo Evaluation of ALOS/PRISM Data on ESA-AO Test Sites – First DLR Results

Mathias Schneider, Manfred Lehner, Rupert Müller, Peter Reinartz German Aerospace Center (DLR) Remote Sensing Technology Institute D-82234 Wessling, Germany e-mail: {Mathias.Schneider, Manfred.Lehner, Rupert.Mueller, Peter.Reinartz}

ALOS 2008 Symposium, Rhodes, Greece, November 3 – 7, 2008

Keywords: PRISM data processing, Digital elevation models (DEM), Ortho-rectification


DLR's Remote Sensing Technology Institute has more than 20 years of history in developing spaceborne stereo scanners (MEOSS, MOMS) and the corresponding stereo evaluation software systems. It takes part in the ESA/JAXA-AO Program to evaluate the potential of the three-line stereo scanner PRISM onboard the Japanese satellite ALOS as a principal investigator. German (Southeast Bavaria) and Spanish (Catalonia) test sites are proposed for which also PI evaluations for SPOT-5 HRS Scientific Assessment Program (SAP) had been done already in 2003-4, and for Indian CARTOSAT-1 (C-SAP) from 2006 onwards. An additional test site is located in Yemen for which also SPOT, IKONOS, ASTER and aerial photography datasets are available. The results of this test site are evaluated in cooperation with the German Institute for Geosciences and Natural resources (BGR) in Hannover. At DLR, processing chains for three-line scanners already exist and with knowledge about the interior and exterior orientation, digital surface models (DSM) and orthoimages can be generated from PRISM imagery. In the first part of the paper, the computing of the exterior and interior orientation from the auxiliary data, provided in the PRISM supplemental file, is described. For the analysis of the image quality and auxiliary satellite data quality, ground truth in form of high resolution aerial orthoimages, ground control points extracted from the various image data, and digital elevation/surface models from the corresponding survey institutes and from previous analysis of SPOT-5 and CARTOSAT-1 stereo data are available. Photogrammetric adjustment is used for this analysis and for the improvement of the exterior and interior orientation parameters. RPCs for the PRISM images are computed and the results are compared to the results of the rigorous model. The second part of the paper presents the comparisons of the orthoimages and DSMs generated from ALOS/PRISM data to the templates from survey and from former stereo evaluations. In overlapping areas, orthoimages are also compared to the earlier SPOT-5 and CARTOSAT-1 orthoimages of the test sites via automatic image matching.


Symposium presentation


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