Mathematics – Logic
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991rese.symp.....r&link_type=abstract
Presented at the 4th Brazilian Symposium for Remote Sensing, Natal, Brazil, Oct. 1988
Mathematics
Logic
Geology, Photointerpretation, Remote Sensing, Solar Position, Structural Properties (Geology), Sunlight, Azimuth, Brazil, Elevation Angle, Landsat Satellites, Relief Maps, Seasons, Topography
Scientific paper
The geology of the westernmost part of Rio de Janeiro State (Brazil) is characterized by the conspicuous presence of the Alem Paraiba lineament, a large shear zone extending more than 200 km in N50-60E direction. Parts of Paraiba do Sul river and of the regional topography are strongly related to this geologic feature. Several other lineament directions complete the structural framework that can be seen on remote sensing products. According to well accepted theories of photointerpretation, LANDSAT images with low sun elevation angles should more clearly show those lineaments, because the shadow enhancement of the relief is greatest. Also, considering the high grade of relief conditionment by the Alem Paraiba lineament, it is expected that this structure could be clearly observed on LANDSAT images of all seasons. However, these hypotheses are not confirmed. The images with low sun elevation angles belong to the epoch (winter) in which the solar azimuths are nearly parallel to the regional structure, making its identification difficult. In summer, the images have high sun elevation angles but their solar azimuths, oblique to the regional structures, allow an adequate identification of the main structural trend.
Liu Chan Chiang
Rodrigues Jose Eduardo
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