科研之友
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摘要
A Digital Elevation Model (DEM) represents the continuous variation of terrain elevation that helps in visualizing the landscape. Most geo-scientific applications need good knowledge and visualization of the topography of the Earth's surface. This paper elucidates, with example, the potential of satellite derived DEM and high resolution remotely sensed data for visualization of landforms. A preliminary virtual tour to any terrain can be made using DEM and emotely sensed data before carrying out actual mapping. Two forms of visualization are exemplified: overview visualization showing regional set up and individual site visualization. Geologic substrate often controls the slope gradient and morphology, which in turn influence the drainage, weathering conditions, land use-land cover etc. Computer visualizations allow the inter-relationships between these conditions to be easily portrayed compared to the use of traditional maps, field photos etc. Guwahati, the capital city of Assam, is the main hub for political, administrative, industrial, educational, commercial and many other activities in the entire North East India. The city is expanding in all fronts at a tremendous rate and because of rapid urbanization, at many locations natural slopes/landforms are being altered by anthropogenic activities. This paper attempts to visualize the present landform condition of Guwahati metropolitan area from the perspectives of bedrock conditions, slope morphology and geomorphic processes and to present alternative strategy to visualize site conditions in and around the city.
- 出版日期2010
