Analysis of SAR image geolocation accuracy for mapping

Jose A. Goncalves

doi:10.1117/12.511034

12 January 2004 Analysis of SAR image geolocation accuracy for mapping

Jose A. Goncalves

Proceedings Volume 5236, SAR Image Analysis, Modeling, and Techniques VI; (2004) https://doi.org/10.1117/12.511034
Event: Remote Sensing, 2003, Barcelona, Spain

Abstract

Topographic applications of satellite images, such as image map production and digital elevation model (DEM) generation, are particularly important in remote and unmapped areas. These applications require a precise image geo-referencing but ground control point (GCP) acquisition is normally difficult in those areas. Ancillary data supplied with images can provide exterior orientation parameters with some accuracy. In the case of SAR images the knowledge of a precise orbit and time and range references can provide the required image geo-referencing. This paper presents an analysis of the geo-location of a set of Radarsat and ERS-2 images. Errors of a few pixels were found, with a systematic character, allowing for an improvement of image orientation by slight adjustments in range and time references. A minimum of one GCP is required for that. Some examples of ortho image generation and DEM extraction are presented.

Citation Download Citation

Jose A. Goncalves "Analysis of SAR image geolocation accuracy for mapping", Proc. SPIE 5236, SAR Image Analysis, Modeling, and Techniques VI, (12 January 2004); https://doi.org/10.1117/12.511034

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