Based On Rs And Gis Dynamic Change Of Wetland And Purification Efficacy Studies

Wetland is one of the survival of the human environment, abundant resources, so people started very early use of its production, life to provide energy and services. With the development of economy, the increase of population, Formation of the wetland resources overexploitation, destroyed the original wetland ecological system, the wetland ecosystem deterioration occurs, urges the people to its internal mechanism, function and so on the essential attribute of the understanding and research. In order to better repair, reconstruction of damaged wetland, rational development and utilization of the wetland resources.Based on this situation, this paper combines the geographic information system and remote sensing technology, focusing on Dianchi Caohai Lake wetland changes in the periphery are analyzed, summary of the wetland distribution and variation of water quality influence. This thesis mainly focuses on the following aspects of the work:1. Collecting cover the whole of Dianchi Caohai remote sensing image in2004,2006,2008and2010.2. Collecting on Wetlands in terms of the number of related materials, in the domestic and international research status of the wetland do a thorough investigation.3. In the case of Dianchi Caohai Lake Wetland on the basis of full understanding, was carried out to determine the wetland classification scheme.4. In the light of Dianchi Caohai wetland site after checking, established wetland interpretation signs. According to the established interpretation signs on the four image of the visual interpretation, and the dynamic analysising.5. Using the software of ArcGIS overlay analysis and correlation analysis different years of wetland distribution map. Identify changes in regional, combined with the water quality variation of study, analysising the existing wetland efficiency, and proposed the corresponding improvement measure.In the end of the study, some do not elaborate accordingly.