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Proceedings Paper

Analysis of SAR image geolocation accuracy for mapping
Author(s): Jose A. Goncalves
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Paper 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.

Paper Details

Date Published: 12 January 2004
PDF: 10 pages
Proc. SPIE 5236, SAR Image Analysis, Modeling, and Techniques VI, (12 January 2004); doi: 10.1117/12.511034
Show Author Affiliations
Jose A. Goncalves, Univ. do Porto (Portugal)

Published in SPIE Proceedings Vol. 5236:
SAR Image Analysis, Modeling, and Techniques VI
Francesco Posa, Editor(s)

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