Research On Guangxi Coastal Zone Change Based On "3S" Technology

Coastal Zone is located at the turn of land and sea, rich in natural resources, excellent natural environment and special geographical location, which is the most active and most important region of human activity, and brings a great role to human survival and development. In the double influence of natural factors and human activities, coastal zone resources and environment have been seriously damaged, and is counterworking the economic and social continuable development. Therefore, using modern technique to fleetly obtain the coastal zone dynamic change information, to strengthen the coastal zones monitoring research and integrated management, which takes quite important practical effect to promote the coordinated development of the society and economic.Guangxi coastal zone is located at the western end of Chinese shoreline, which is the only access to the sea for western China, so it has an important strategic position. This paper takes it as the study area, selects four types of remote sensing imagery and related ancillary data, enhances the coastal zone all kinds of thematic information by the analysis of image space and geo-spatial relationship; According to the spectral response characteristics of sea, beach, land surface features in remote sensing image, makes use of many remote sensing classification technology to extract the coastal zone change information: Takes full advantage of the spectral characteristics of remote sensing images, uses the technology of K-T transform and vegetation extract index, classifies and extractes the culture information on the beach;manages multi-step stratified classification mothod to research 30 years of land use / cover changes rule in coastal areas of Guangxi; On this basis, takes GIS technology to put the extracted coastal zone change information together, from space and time postes its change rule; Finally from the two views of man- made and natural, researches the dynamic mechanism of coastal zone environmental changes and analyzes the characteristics and causes of coastal zone vulnerability. It provides scientific reference for the rational development and utilization of Guangxi coastal zone.