Study on Dynamic Change of Regional Landscape Based on RS and GIS

With the TM images in 1990 and 2005 and in the support of RS and GIS techniques, this paper applies the maximum likelihood classification and the Fragstats3.3 calculation software to calculate and analyze 9 landscape indices in three counties, Heng dong County, Hengshan County and Hengyang City. The studies have shown that: 1. For the three studied cities, the reduction of woodland is largest than other lands while the farmland increases most, and the area of average patch of farmland rises most among all the landscape types, 2. For Heng dong County and Hengshan County, PD (patch density) of woodland increases while PD of farmland decreases, and the degree of fragmentation of woodland increases. 3. For Hengyang City, PD gets decreased and the degree of fragmentation of woodland also drops. 4. The degree of fragmentation of farmland and construction land reduced. According to the study, the authors regard that the analysis of landscape index can reveal the spatial structure characteristics of landscape and different conditions of region, so as to provide a new method for ecological zoning of landscape.