Temporal and Spatial Evolution of NDVI and Its Response Analysis with Climate and DEM Based on Landsat image

To explore temporal and spatial evolution of NDVI and its response relation with Climate in Kunming, Yunnan Province, it is is of great significance to the ecological environmental protection and ecological safety construction. Based on the Landsat data of Kunming City from 2010 to 2018 and the meteorological data of Kunming City during the same period, this paper uses the method of pixel dichotomy, correlation analysis and other methods to analyze the temporal and spatial evolution of vegetation coverage and its response to climate change in the past 9 years. The results show that: (1) From 2010 to 2018, Kunming's average annual NDVI showed an upward trend, with an increase of 0.017/year. In 2018, the area covered by high vegetation was as high as 54%, and the ecological environment of Kunming City was significantly improved. (2) The change of NDVI in Kunming is insignificantly positively correlated with annual precipitation and insignificantly negatively correlated with annual average temperature, but has a higher correlation with annual average temperature and is more sensitive to temperature factors. (3) The correlation between NDVI change and elevation differentiation is significant within the elevation zone of 619 ~ 2642m in Kunming city, NDVI increases with the increase of elevation.