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Proceedings Paper

Semiautomatic stereoscopic radar image analysis
Author(s): V. Ansan; Eric Thouvenot
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Paper Abstract

Synthetic aperture radar is an active ranging sensor that is very sensitive to terrain slope. From available information included in radar image pixel, a Digital Elevation Model (DEM) may be generated. The radargrammetry is a method that derives a topographic map from two overlapping radar images, a set of homologous points and platform motion and geometry parameters. This method is based on the parallax in range direction. The stereoscopic radar image analysis consists of three main processing steps: (1) selection and plotting of homologous points, (2) elevation calculation based on the geometry of radar images (height and distance between the antennas, and look angles), and (3) elevation interpolation in order to generate a DEM. We develop an automatic research of homologous points location in the two images, taking into account geometry of radar image acquisition and curvature of the planet. This is based on automatic analysis of shape recognition determined by a threshold on pixel radiometric gradient. We use this method by an iterative way. Their elevation is calculated and interpolated on a regular grid to generate a DEM. The elevation accuracy depends on spatial resolution. This method has been tested on AIRSAR and Magellan images.

Paper Details

Date Published: 17 November 1995
PDF: 8 pages
Proc. SPIE 2579, Image and Signal Processing for Remote Sensing II, (17 November 1995); doi: 10.1117/12.226830
Show Author Affiliations
V. Ansan, Univ. Paris-Sud (France)
Eric Thouvenot, Ctr. National d'Etudes Spatiales (France)

Published in SPIE Proceedings Vol. 2579:
Image and Signal Processing for Remote Sensing II
Jacky Desachy, Editor(s)

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