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Information Extraction and Change Research of the Wetlands Along the Yangtze River and Lakes in Anqing

Author: SunBuWei
Tutor: ZhaoPing
School: Anhui Normal University
Course: Cartography and Geographic Information Systems
Keywords: Composite transformation Wetlands Decision Tree Fractal Stability Index
CLC: X37
Type: Master's thesis
Year: 2010
Downloads: 101
Quote: 0
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Abstract


Wetlands with a variety of unique environmental features and ecological benefits, plays an extremely important role in maintaining the ecological balance of the Earth's surface , and thus subject of great concern . How fast and accurate access to the basic information of the wetlands , and monitor the dynamic changes , has always been wet hot research topic . Anqing along the lakes and wetlands is an important part of the middle and lower reaches of the Yangtze River freshwater wetlands complex and diverse functions . Support of RS and GIS technology as the main research information 1989,1995,1999,2 ( ) ( 2 2 [ J ( 7 years five TM images and wetlands along the Yangtze River in Anqing Remote Sensing Dynamic Monitoring a study , the main research contents and results are as follows : (1) in accordance with the Convention on wetlands and Chinese wetland resources investigation and monitoring technology point of order \by HSv, IHs, LBV, K-T and other transform and sampling and analysis ) on the basis of the advantages and disadvantages of comparative analysis of domestic and international wetland information extraction method , to construct new index and spectral change based on composite vine the wetland information automatically extracted from the decision tree methodology to eliminate the impact of subjective factors in the selection threshold range bandit fast, accurate, objective extract of the seven types of wetlands in the study area . (3 ) Landscape Ecology learning and fractal theory as a theoretical basis , the use of statistical indicators ( around the class is the number of polygons , perimeter, area ) , the fractal dimension , the stability index indicators , quantitative analysis of the study area of wetland landscape pattern asked for nearly 20 years the dynamic changes that wetland evolution of the study area has gone through three stages, namely deterioration - recovery ___ benign development in recent years , the Anqing along the lake wetland ecological environment be protected at the same time , there are also problems of natural wetlands the area is still decreasing , rivers and lakes is less stable , the study area wetlands environmental protection is still facing a grim situation .

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CLC: > Environmental science, safety science > Administration of Environmental Protection > Rational development of natural resources and environmental protection
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