Variation Characteristics Analysis of the Vegetation Coverage in Midu County Based on Landsat 8 Remote Sensing Image

The purpose of this study is to analyze the general characteristics of the spatial and temporal changes of vegetation coverage of Midu County in 2013, 2014 and 2015. Based on the Landsat 8 satellite remote sensing image data of Midu County in the three different periods, the variation characteristics of the vegetation coverage in Midu County were studied by using normalized difference vegetation index (NDVI) and the dimidiate pixel model. The changes of the vegetation coverage in Midu County between 2013 and 2014 were as follows: the lowest vegetation coverage and the lower vegetation coverage were increased by 0.753% and 8.442%, and the moderate vegetation coverage, the higher vegetation coverage and the highest vegetation coverage were decreased by 0.528%, 8.564% and 0.071%, respectively. Then the changes of the vegetation coverage in Midu County between 2014 and 2015 were: the lowest vegetation coverage, the lower vegetation coverage and the moderate vegetation coverage were decreased by 1.852%, 13.158% and 6.249%, and the higher vegetation coverage and the highest vegetation coverage were increased by 0.900% and 20.358%, respectively. The vegetation coverage rate above moderate level in Midu County was 85.35% in 2013, 76% in 2014 and 91.17% in 2015. It can be seen that the vegetation coverage of the Midu County were all above intermediate or high level during the study period, so the overall vegetation cover was in good condition. The comprehensive use of GIS, RS and statistical analysis method is the main innovation of this research, and the results can provide valuable reference for the local ecological environmental protection and scientific development.