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The Combined Effect of Orientation Angle and Material on PolSAR Images of Urban Areas

SONDRA, ONERA, CentraleSupélec, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
ONERA, Traitement de l’information et systèmes, Université Paris-Saclay, 91123 Palaiseau, France
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Remote Sens. 2020, 12(10), 1632;
Received: 23 March 2020 / Revised: 13 May 2020 / Accepted: 14 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Applications of SAR Images for Urban Areas)
Polarimetric Synthetic Aperture Radar (PolSAR) images containing cities may exhibit misclassified areas when using polarimetric decompositions. Several articles relate this problem to the effects of orientation between the facades of buildings and the acquisition trajectory. Materials also play a role in polarimetric behavior. This paper deals with this combined effect of material and orientation. It analyzes different sets of data, airborne or space-borne, at L-, C- and X-bands, and for different orientation angles. It shows that considering dielectric dihedral rather than metallic in the polarimetric mechanism of double-bounce has a very important impact on the differences of intensities between the channels HH and VV. This difference is very important for small angles of orientation, and then decreases for large angles. Furthermore, the curves of the ratios between polarimetric intensities as a function of the orientation angle vary little with the materials and the frequencies encountered in all the scenarios envisaged. The signal of the ratio VV/HH raises a plateau around −1 dB for orientations higher than 30°. We also observe a plateau for HV/HH, but with a value around −5 dB. View Full-Text
Keywords: SAR; polarimetry; urban areas; material; rotation; Brewster’s angle SAR; polarimetry; urban areas; material; rotation; Brewster’s angle
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MDPI and ACS Style

Thirion-Lefevre, L.; Guinvarc’h, R.; Colin-Koeniguer, E. The Combined Effect of Orientation Angle and Material on PolSAR Images of Urban Areas. Remote Sens. 2020, 12, 1632.

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