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3D Radargrammetric Modeling of Radarsat-2 Ultra-Fine and Polarimetric Modes

Thierry Toutin(1) and Rene Chenier(1)

(1) Canada Centre for Remote Sensing, 588 Booth Street, K1A 0Y7, Canada


The geometry and the accuracy of the three-dimensional (3-D) cartographic localisation of RADARSAT-2 images are being evaluated as part of the Canadian Space Agency’s Science and Operational Applications Research program. In a first step, the Toutin’s 3-D physical model, previously developed for Radarsat-1, was adapted to Radarsat-2 sensor and applied to two ultra-fine mode and polarimetric stereo-images acquired over an area in Beauport, Quebec. THe first experiments were performed for the ultra-fine mode. The 3-D modeling was computed with ground control points and the planimetric and altimetric localisation were evaluated with different checked data: (1) the root mean square errors computed over independent check points are 1 m in planimetry and 2 m in elevation; (2) the error from the overlay of the two quasi-epipolar images is less than 0.25 m; (3) the error from the comparison of the two ortho-images is less than 1 m; and (4) the comparison with 1-m accurate ortho-photos is less than 1 m. The main result deduced from the relative error between the quasi-epipolaris images is that the internal accuracy of Toutin’s 3-D radargrammetric model is better than 20 cm. Because all results and validations are in agreement and because the checked data error is included in these evaluations, it give a high level of confidence that the 2-D geometric localization and restitution accuracy is 2 m in planimetry while the 3-D geometric localization and stereo-restitution accuracy is 1 m in planimetry and 2 m in elevation. Other accuracy evaluation will be presented at the Workshop using better ground data (DGPS points). but also the polarimetric fine mode will be processed and evaluated


Workshop presentation

Full paper


  Higher level                 Last modified: 07.05.06