Analysis of the landscape change at River Basin scale based on SPOT and TM fusion remote sensing images: a case study of the Weigou River Basin on the Chinese Loess Plateau |
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| Authors: | Dong Xiaofeng Liu Lichen Wang Jianhua Shi Jin Pan Jinghu |
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| Institution: | (1) College of Resource and Environmental Science, Lanzhou University, Lanzhou, 730000, China;(2) Cold and Arid Regional Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;(3) School of Agricultural and Forestry Economics, Lanzhou Commercial College, Lanzhou, 730020, China;(4) Development and Application Research Center of GIS, Northwest Normal University, Lanzhou, 730070, China |
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| Abstract: | Eco-environmental changes which generally manifest as the ecological landscape changes are mainly affected by natural and
human factors. Through complex interaction, natural factors and human activities alter the landscape structure and decide
the service function of regional ecosystem. With the development of geographical information system (GIS) and satellite remote
sensing (RS) techniques, the researches on quantitative analysis of landscape changes have made great strides forward. In
this paper, the landscape change dynamics in the Weigou River basin have been investigated by the combined use of high-resolution
RS images and GIS techniques. The objectives are to determine the landscape transition rates among landscape types and to
quantify changes of various landscape indexes using FRAGSTATS, one of the spatial pattern analysis programs for categorical
maps. Under man–machine interactive interpretation method, all of the 10-m resolution SPOT + TM images are classified into
six primary types (farmland, forest, grassland, water, construction area and desert) and 12 sub-types based on the interpretation
key which was established based on 1947 filed pictures in the Weigou River basin. A field check on the data accuracy shows
that the total interpretation accuracy approaches 97.53%. Significant land-use change has taken place in the Weigou River
basin over the six years from 1998 to 2004 due to rehabilitation measures. The results show that there has been a notable
decrease in farmland mainly due to conversion to forest and grassland, the landscape heterogeneity and evenness has increased,
and there is a greater connectivity. The dominance of farmland patch has decreased. And hence the ecological environment has
started to develop in a reversing direction. The study of the integration of high-resolution RS images and GIS technique is
an effective approach to analyze the landscape changes at river basin scale. |
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| Keywords: | Landscape change SPOT + TM image Remote sensing and GIS FRAGSTATS Weigou river basin |
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