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Guidelines for environmental and geological site characterization normally include field methods with little attention to remote sensing techniques. This paper provides some useful image enhancement guidelines that will facilitate geological mapping and environmental monitoring of vegetated sites.
Image enhancement techniques for environmental and geological site characterization provide information on land use, vegetation stress, fracture systems, rock types, landforms, surficial materials, moisture and drainage. In areas where the rock units are covered by vegetation and soil/drift cover, it is difficult to delineate rock types and surficial materials unless special image enhancement is performed. Selection of specific sensor characteristics and surface conditions can maximize the image enhancement techniques and therefore provide useful geologic information. This paper provides useful image enhancement techniques for (1) locating areas of vegetation stress related to acid mine drainage from high resolution airborne multispectral images; and for (2) mapping surficial materials, landforms, rock types and fractures from SAR-TM color composites, the selective uses of principal component analysis and spatial filtering techniques of TM and SAR images, and the integration of SAR and magnetics.
image enhancement, site characterization, vegetated areas, SAR/TM, guidelines, surficial materials, lineament, lithology, vegetation stress
Senior Research Scientist, Canada Centre for Remote Sensing,