Abstract
This paper discusses the theoretical and practical aspects related to SAR and hybrid sensors (VIR - Visible-Infra Red x SAR - Synthetic Aperture Radar ) stereoscopies, and their performance for geological mapping in the Amazon Region. Stereo Standard-RADARSAT-1 (S5D x S7D) and hybrid Standard-RADARSAT-1/TM-Landsat-5 (S7D x TM4) were visually evaluated aiming at geological mapping in the Carajas Mineral Province. The stereo SAR pair has shown large differences in radiometric and geometric properties when compared to the VIR x SAR stereo pair. The investigation has also demonstrated that these differences play a key role in the extraction of geological information and also confirmed that previous background in SAR and radargrammetry are fundamental issues in the composition and interpretation of the SAR and hybrid products. The research has indicated the greater potentiality of the VIR x SAR product when compared to the SAR stereoscopy. The complementary nature of the information provided by both sensors in distinct region of the electromagnetic spectrum was a fundamental cause for this better performance.
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