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Orthorectification of VHR optical satellite data exploiting the geometric accuracy of TerraSAR-X data

Reinartz, Peter and Müller, Rupert and Schwind, Peter and Suri, Sahil and Bamler, Richard (2011) Orthorectification of VHR optical satellite data exploiting the geometric accuracy of TerraSAR-X data. ISPRS Journal of Photogrammetry and Remote Sensing, 66 (1), pp. 124-132. Elsevier. doi: 10.1016/j.isprsjprs.2010.10.003. ISSN 0924-2716.

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Orthorectification of satellite data is one of the most important pre-processing steps for application oriented evaluations and for image data input into Geographic Information Systems. Although highand very high-resolution optical data can be rectified without ground control points (GCPs) using an underlying digital elevation model (DEM) to positional root mean square errors (RMSEs) between 3 m and several hundred meters (depending on the satellite), there is still need for ground control with higher precision to reach lower RMSE values for the orthoimages. The very high geometric accuracy of geocoded data of the TerraSAR-X satellite has been shown in several investigations. This is due to the fact that the SAR antenna measures distances which are mainly dependent on the terrain height and the position of the satellite. The latter can be measured with high precision, whereas the satellite attitude need not be known exactly. If the used DEM is of high accuracy, the resulting geocoded SAR data are very precise in their geolocation. This precision can be exploited to improve the orientation knowledge and thereby the geometric accuracy of the rectified optical satellite data. The challenge is to match two kinds of image data, which exhibit very different geometric and radiometric properties. Simple correlation techniques do not work and the goal is to develop a robust method which works even for urban areas, including radar shadows, layover and foreshortening effects. First the optical data have to be rectified with the available interior and exterior orientation data or using rational polynomial coefficients (RPCs). From this approximation, the technique used is the measurement of small identical areas in the optical and radar images by automatic image matching, using a newly developed adapted mutual information procedure followed by an estimation of correction terms for the exterior orientation or the RPC coefficients. The matching areas are selected randomly from a regular grid covering the whole imagery. By adjustment calculations, parameters from falsely matched areas can be eliminated and optimal improvement parameters are found. The original optical data are orthorectified again using the delivered metadata together with these corrections and the available DEM. As proof of method the orthorectified data from IKONOS and ALOS-PRISM sensors are compared with conventional ground control information from high-precision orthoimage maps of the German Cartographic Survey. The results show that this method is robust, even for urban areas. Although the resulting RMSE values are in the order of 2–6 m, the advantage is that this result can be reached even for optical sensors which do not exhibit low RMSE values without using manual GCP measurements.

Item URL in elib:https://elib.dlr.de/68085/
Document Type:Article
Title:Orthorectification of VHR optical satellite data exploiting the geometric accuracy of TerraSAR-X data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Reinartz, Peterpeter.reinartz (at) dlr.deUNSPECIFIED
Müller, Rupertrupert.mueller (at) dlr.deUNSPECIFIED
Schwind, Peterpeter.schwind (at) dlr.deUNSPECIFIED
Suri, Sahilsahilsuri4u (at) gmail.comUNSPECIFIED
Bamler, Richardrichard.bamler (at) dlr.deUNSPECIFIED
Date:January 2011
Journal or Publication Title:ISPRS Journal of Photogrammetry and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.isprsjprs.2010.10.003
Page Range:pp. 124-132
EditorsEmailEditor's ORCID iD
International, Society for Photogrammetry and Remote SensingUNSPECIFIEDUNSPECIFIED
Keywords:Orthorectification, Matching, Optical data, Radar data, Mutual information
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):W - Vorhaben Photogrammetrie und Bildanalyse (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By: Reinartz, Prof. Dr.. Peter
Deposited On:07 Jan 2011 09:16
Last Modified:06 Sep 2019 15:28

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