A Study On Ecological Environment Changes By Remote Sensing In Jiangxi Province Based On Data Reconstruction

Ecological environment is the foundation of human survival and development, which is a prerequisite for economic and social sustainable development. Its advantages and disadvantages directly affect the quality of human survival quality. In2007, strategic goal of "Ecological Province Green Rise" has been proposed to deal with the ecological damage caused by climate change, human activities and economic development. To better understand the ecological environment change and evolution process in Jiangxi Province, this paper uses remote sensing data and statistical yearbook data as the data source, which based on MODIS time series data sets by data reconstruction. Combining with RS and GIS technology, ecological environment elements of spatial and temporal change analysis is adopted to evaluate the overall quality of the environment in Jiangxi Province. Conclusions include:(1)On the basis of different MODIS quality control band and spatial distance weight of S-G filter, an integrated method has been proposed. By assigning weights to different quality pixel, combined with traditional BISE and SG filter, its method can effectively improve the quality of the raw data regardless of clouds and influence of atmospheric aerosols.(2)Spatial and temporal distribution of various ecological environment elements is analyzed, such as terrain factor, vegetation cover, land surface temperature, water area, and disturbance index.Results show that the study area lying south is higher than in the north,57.9%of total area within8°slope suitable for farming.Over the past10years, the average annual vegetation coverage increased from65.4%to69.6%. Compared with the middle and northern parts of the province, the other regions show higher vegetation coverage in its spatial distribution. Annual average land surface temperature (LST) in10years showed a fluctuated trend, the LST in city is higher than other regions generally. Water area for10years is between4307km2to4822km2in fluctuations, where2011water area declined worst of276km2because of drought. The total area of disturbance occurred1826km2, which positive disturbance area is1150km2and negative disturbance area of676km2respectively. Negative disturbance mainly occurs in northern area, while positive disturbance is obvious in southern regions.(3)Considering the actual situation in Jiangxi Province, principal component analysis is used in selecting assessment indicators quantitatively, and then a comprehensive evaluation system of ecological environment in Jiangxi Province is established. By using analytic hierarchy process, ecological environment quality in Jiangxi is calculated for2004and2012. Results show that:2012is better than2004, showing a good level of overall ecological environment quality. In detail, Jiujiang, Jingdezhen and Fuzhou city is at the forefront of the province with better ecological environment. Obvious improvements have been implemented in Nanchang and Yichuan city, while Pinxiang and Xinyu are still to be improved and protected in future.