TITLE:
PALSAR-FBS L-HH Mode and Landsat-TM Data Fusion for Geological Mapping
AUTHORS:
Abderrazak Bannari, Ali El-Battay, Ali Saquaque, Abdelhafid Miri
KEYWORDS:
Geology, Mineral Exploration, Lineaments Extraction, Data Fusion, Intensity-Hue-Saturation, Mapping, Landsat-TM, PALSAR-FBS, L-HH Polarization, ASTER DEM
JOURNAL NAME:
Advances in Remote Sensing,
Vol.5 No.4,
November
21,
2016
ABSTRACT: Characterized by lithological diversity and rich mineral resources, Benshangul-Gumuz
National Regional State located in Asosa Zones, Western Ethiopia has been investigated
for geological mapping and morpho-structural lineaments extraction using
PALSAR (Phased Array type L-band Synthetic Aperture Radar ) Fine Beam Single
(FBS) L-HH polarization and Landsat-5 TM (Thematic Mapper ) datasets. These data
were preprocessed to retrieve ground surface reflectance and backscatter coefficients.
To overcome the geometry acquisition between the two sensors, they were geometrically
and topographically rectified using ASTER-V2 DEM. Intensity-Hue-Saturation,
directional filters and automatic lineaments extraction were applied on the datasets
for lithological units’ discrimination and structural delimitation for potential mineral
exploration. The obtained results showed good relationship among the topographic
morphology, rock-substrate, structural variations properties, and drainage network.
The spectral variations were easily associated with lithological units. Likewise, the
morpho-structural information highlighted in the PALSAR image was visible without
altering the radiometric integrity of the details in TM bands through the fusion
process. Moreover, predominant lineaments directions trending NE-SW, NS, and
NW-SE were identified. Results of this study highlighted the importance of the PALSAR
FBS L-HH mode and TM data fusion to enhance geological features and lithological
units for mineral exploration particularly in tropical zones.