Vegetation index changes of wetland nature reserves based on evolution of Yellow river

Using ERDAS IMAGINE as the main tool, processed CBERS image of Zhengzhou in 2000 and 2009 years, to get images of wetland nature reserves in Zhengzhou of the two years. Extracting the NDVI information from the image of wetland nature reserves of the two years by a NDVI model, and then get a two-year NDVI change image of wetland nature reserves. While, based on the 2000 and 2009´s vector data of the Yellow river, get the two-year changes image of the channel. By analyzing both the channel change and the NDVI change information, get the information that how the channel change works on the NDVI: the NDVI will has a substantial increasion after the channel changes into bottomland, while there will be a substantial decrease when the bottomland develops into a channel. But either the increase or the decrease is different in different location. Compared to 2000 year, the NDVI of nature reserves of Zhengzhou wetland in 2009 has little increasing.