Abstract
Abstract. This research investigates the integration of the Phased Array type L-band Synthetic Aperture Radar (PALSAR) and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellite data for geological mapping applications in tropical environments. The eastern part of the central belt of peninsular Malaysia has been investigated to identify structural features and mineral mapping using PALSAR and ASTER data. Adaptive local sigma and directional filters were applied to PALSAR data for detecting geological structure elements in the study area. The vegetation, mineralogic and lithologic indices for ASTER bands were tested in tropical climate. Lineaments (fault and fractures) and curvilinear (anticline or syncline) were detected using PALSAR fused image of directional filters (N-S, NE-SW, and NW-SE).Vegetation index image map show vegetation cover by fusing ASTER VNIR bands. High concentration of clay minerals zone was detected using fused image map derived from ASTER SWIR bands. Fusion of ASTER TIR bands produced image map of the lithological units. Results indicate that data integration and data fusion from PALSAR and ASTER sources enhanced information extraction for geological mapping in tropical environments.
Highlights
Synthetic Aperture Radar (SAR) is an active microwave remote sensing system which can acquire data with high resolution regardless of day or night time, cloud, haze or smoke over a region
Directional filters were applied to the Phased Array type L-band Synthetic Aperture Radar (PALSAR) HH and HV polarization images
The OHI, KLI and ALI indices have been applied to the ASTER level 1B and 2B05S products to identify the location of high concentration of clay minerals in the scene
Summary
Synthetic Aperture Radar (SAR) is an active microwave remote sensing system which can acquire data with high resolution regardless of day or night time, cloud, haze or smoke over a region. Clouds are reasonably transparent to microwave providing measurements with almost any weather conditions. Longer wavelengths optimize the depth of investigation of the radar signal. The long wavelengths allow radar to have complete atmospheric transmission. The approximate depth of penetration is equal to radar’s nominal wavelength. In tropical environments having the persistent cloud coverage, dense to complete vegetation cover and limited bedrock exposures, L-band SAR data provide the possibility of obtaining more useable geological structure information from the ground (Pour and Hashim, 2014, 2015)
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