Evaluation and transformation analysis of ecological environment in Beijing based on remote sensing

Remote sensing technology was selected and combined with field survey to extract land-cover information of Beijing. Taking the land-cover layer in 2000 as the background data, the updated layer data of 2005 and 2006 were produced by using remote sensing image change detection methodology. Technical Criterion for Eco-environmental Status Evaluation, a newly published standard of environmental protection industry (HJ/T192-2006) in China, was referenced. Then, the indices of biology abundance, vegetation covering, water network density, land degeneration and environment quality of Beijing in 2000, 2005 and 2006 were calculated respectively. The integrated ecologic environmental status indices were calculated based on above results. We carried out the classified evaluation and integrated analysis on the change of Beijing ecological environment status between 2000 and 2006. It was found that the ecological environment status of Beijing in recent years was maintained on the GOOD level. Nevertheless, it shows there are obvious changes among some environmental factors. Primarily, vegetation-covering rate decreasing, residential land expansion, water resources lesson and air pollution emission control are the most factors those affect Beijing ecological environment status. Suggestions for enhancing Beijing ecological environment status were put forward. Characteristics of applying remote sensing technology to the evaluation of ecological environment status were analyzed also.