A tool for semi-automatic linear feature detection based on DTM
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Abstract Lineament maps drawn from several LANDSAT images of a part of north Wales and western England display considerable variation in the number of lineaments identified. Analysis of the maps shows that it is not the case that maps with fewer lineaments are simply subsets of those with many lineaments. Rather, each map contains a high proportion of lineaments that are unique to it. Despite these differences, the same preferred lineament orientation is identified from almost all maps. These results imply that all available LANDSAT imagery may usefully contribute to a lineament analysis, little value may be placed on the density of lineaments seen on any one image and preferred lineament orientation is relatively easy to identify. It is concluded that guarded use may be made of lineament analysis in geology. Lineament maps may be employed to suggest hypotheses rather than to test them.
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Digital Elevation Model (DEM) data are produced from Geographic Information Systems (GIS) and express topography based on elevation sets. It is a remarkable tool to observe and analyse tectonic and structural lineaments especially in areas of limited or no access. Limited work has been done in the field of morpho-tectonics and morpho-structural analysis in the area which limits the understanding of the tectonic evolution of Sarawak. The primary objective of this work was to observe and understand the lineament trend of the area and its relation to tectonic implications. Due to inaccessibility of many onshore parts of Central Sarawak, the location of study was divided into several zones and high resolution Digital Elevation Models were used to carry out structural lineament analysis in this study. Processing of DEM data sets help to control factors pertaining to sun azimuth and sun angles in order to create shaded relief images by illumination method. Manipulation of these attributes aid in obtaining images with different enhanced
features and to observe the continuity of lineaments. From the resulting images,lineaments will be mapped and interpreted based on tectonic evolution that occurred
in the area either locally or regionally. By understanding geomorphology and tectonic history of a region, it could help in the exploration of new prospect.
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Geological tectonism is the precondition of Karst landscape developing,but the controlling effects of tectonism were qualitatively described in most researches other than quantitatively analyzed.Using spatial statistics methods,this paper studies the controlling effect of tectonic lineaments on valley/depression pattern in order to quantitatively analyze the effect of tectonism on Karst landscape.Based on Landsat ETM imagery and tectonic linear system map,valley/depression distribution map are interpreted.Density analysis of tectonic lineaments is used to discover its spatial pattern,correlate analysis and regression analysis are use to study the relationship between the size of valley/depression and total length and quantities of tectonic lineaments in the valley/depression.The result shows that the size of valley/depression landscape in Karst region has positive linear correlativity with the length and quantity of the tectonic lineaments,that is to say,longer the tectonic lineament is,and more intersections are among them,then larger the size of the landscape is.The result also shows that tectonic lineament can not only be used in regional geological tectonic pattern study and deposit forecasting,but also can be used to explain differences among surface landscapes.
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