Digital Landsat TM-data used in the mapping of large scale geological structures on the coast of central Norway.
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Landsat-5 Thematic Mapper (TM) data has been used to map linear structures of three areas of Trøndelag, central Norway, where offshore activities demand more information about geological structures. The aim of the project was to utilise digital TM-data through an image processing system to enhance detection and analysis of large-scale planar structural features in the bedrock of these areas. Different types of image enhancements were tested before a simple procedure of linear stretching of the TM-channels and generation of colour composites was developed. Interpretation of large-scale linear features was done from the colour composities. Bedrock foliation, joints and related linear features representing fault zones, fracture zones etc. were plotted on base maps and then digitized to produce rosediagrams and sector maps.\u00FF