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Stereo Evaluation of CARTOSAT-1 Data Summary of DLR Results During CARTOSAT-1 Scientific Assessment Program

Lehner, Manfred and d'Angelo, Pablo and Müller, Rupert and Reinartz, Peter (2008) Stereo Evaluation of CARTOSAT-1 Data Summary of DLR Results During CARTOSAT-1 Scientific Assessment Program. In: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, B1, pp. 1295-1300. International Society for Photogrammetry and Remote Sensing. ISPRS Conference 2008, 2008-07-03 - 2008-07-11, Peking (China). ISSN 1682-1750

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Abstract

The Remote Sensing Technology Institute (IMF) of the German Aerospace Center (DLR) has more than 20 years of history in developing spaceborne stereo scanners and the corresponding stereo evaluation software systems. It takes part in the CARTOSAT-1 Scientific Assessment Program (C-SAP) as a principal investigator for German (Southeast Bavaria) and Spanish (Catalonia) test sites and as a Co-I for a French test site (Mausanne-les-Alpilles). A rich variety of landscapes is present in these three test sites. In all cases ground truth in form of GCP (or orthoimages of high resolution) and DTM/DSM (digital terrain or surface models) of sufficient accuracy have been delivered by the principal investigators.Rational polynomial functions (RPC) are provided by the distributing Indian agency (Space Applications Centre (SAC) of ISRO, Ahmedabad) as a universal sensor model for each scene. The inherent absolute orientation accuracy of the RPC models in the CARTOSAT-1 stereo imagery used here turned out to be around 100 m (normally). Thus, to exploit the high resolution of 2.5 m, RPC have to be corrected via the available ground truth. It is shown that the correction by an affine transformation is necessary in order to achieve sub-pixel accuracy in the stereo evaluation of full scenes. The remaining standard deviations of the residuals in image space during RPC correction are about 0.5-1 pixel in ground control points (GCP). Stereo evaluation is done by DLR processing software. Hierarchical intensity based matching and subsequent region growing are used to automatically derive a dense set of stereo tie points. An effective blunder reduction is based upon bi-directional LSM, quasi-epipolar reprojection of the tie points, and control of residuals in stereo forward intersection. Shifts between aft/fore orthoimages are found to be in sub-pixel range. DSM accuracy assessment is done via the statistics of height differences compiled by the forward intersection software. This is sufficient if accurate GCP for RPC correction are available. For direct comparison of the generated DSM with the reference DTM/DSM a 3D shift is estimated via least squares adjustment and mean and standard deviations of the DTM/DSM differences after shifting are provided. In summary, standard deviations of 2-4 m are achieved.

Item URL in elib:https://elib.dlr.de/55976/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Stereo Evaluation of CARTOSAT-1 Data Summary of DLR Results During CARTOSAT-1 Scientific Assessment Program
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lehner, ManfredUNSPECIFIEDUNSPECIFIED
d'Angelo, PabloUNSPECIFIEDUNSPECIFIED
Müller, RupertUNSPECIFIEDUNSPECIFIED
Reinartz, PeterUNSPECIFIEDUNSPECIFIED
Date:3 July 2008
Journal or Publication Title:The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:B1
Page Range:pp. 1295-1300
Publisher:International Society for Photogrammetry and Remote Sensing
ISSN:1682-1750
Status:Published
Keywords:CARTOSAT-1, Stereoscopic CCD scanner, Rational polynomial model, Matching, DSM generation, Orthoimage, Accuracy analysis
Event Title:ISPRS Conference 2008
Event Location:Peking (China)
Event Type:international Conference
Event Dates:2008-07-03 - 2008-07-11
Organizer:ISPRS
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By: Angelo, Dr. Pablo
Deposited On:06 Nov 2008
Last Modified:31 Jul 2019 19:23

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