Dynamic Change of Fractional Vegetation Cover in Baoding Based on RS and GIS

By using data sources of remote sensing images（TM/OLI images）in 1991，2004 and 2015，vegetation fractional coverage of Baoding was calculated through dimidiate pixel model which based on NDVI，then vegetation fractional coverage grades was divided，and features of its temporal and spatial variation were analyzed.Results showed that vegetation fractional coverage of Baoding presented decline trend for integrated and different areas had different results.The area of low vegetation and medium-low increased，and the area of high vegetation decreased.Decline of main urban area in Baoding was significantly in all the four research districts，vegetation fractional coverage decreased 12.76% and average of decreased rate about 0.5% per year in the twenty five years of 1991—2015.Research showed that urban development，construction，and reduced agricultural land were the main causes for vegetation coverage change.