Study On The Variation Of Landscape Pattern In Pearl River Estuary Based On GIS And RS

Since the opening and reformation, by making full use of the position advantage and policy advantage, the two sides of the Pearl River Estuary has been rapidly developed to be the most active economy development zones in southeast coastal region of China. While high intensity land exploitation and fast expansion of urban area, resulted in cultivated land decreased and natural ecosystem and original vegetation seriously affected and menaced. In this article, we applied the remote sensing and GIS to analyze the landscape pattern of the study area and a comparison study on different landscape characteristics between the two sides of study area was performed. The materials we used include images of SPOT5, scale of 1:10000 and 1:50000 topographic maps, pertinent data and data of field investigation. By a series of data processing to remote sensing images, we extracted the landscape class information of study area. By using the land use data in 1995, 2000, 2003 and calculating different landscape indices and analyzing the landscape patterns quantificationally, conclusions as follow:â‘ We chose the software of PCI to orthophoto correction the Spot digital images, then discussed the image fusion of SPOT5 multi-spectral bands and panchromatic band. By comparing HIS transform, Brovey transform, PCA transform, Gram-schmidt transform and Pansharp transform, Pansharp transform was chose as the suitable method.â‘¡In the process of extracting landscape class information, based on different characteristics of different land use types in images, man-computer interactive interpretation method was used to classify the fusion images and check the classification result by compare it to the land use data in 1995, 2000 and data of field investigation.â‘¢Based on landscape ecology principle, GIS technology and the software FRAGSTATS, the landscape indices of the Pearl River Estuary was calculated. We analyzed the characteristics and variation of landscape pattern and the differences between the two sides of study area. The result show that the patch shape, landscape diversity and the fragmentation of study area have changed in different extent and the landscape matrix, main landscape types, fragmentation between the west and east sides are different. The main driving force is the artificial disturbance.