The Study of Spatial and Temporal Change of Vegetation Cover in Changsha-Zhuzhou-Xiangtan Core Region

Vegetation coverage is an important model parameter in the study of changes in land cover changes, climate change, and other global ecological environmental impact factors. This paper used remote sensing images from 2000, 2005, 2011, and 2016 as data sources. Based on the NDVI pixel dichotomy, the coverage was calculated and the coverage was graded. The transfer matrix method and the difference method were used. The spatial autocorrelation analysis method was used to study the temporal and spatial dynamic changes of vegetation coverage. The results showed that the average coverage of the four phases of the study area was above 0.69, which were 0.78, 0.71, 0.69, and 0.69 respectively. The coverage of vegetation was better, but the overall coverage was declining and tended to be stable. Obviously, the phenomenon of aggregate distribution in the spatial distribution shows the rules of "high-high aggregation" and "low-low aggregation".