Analysis on temporal and spatial changes of vegetation coverage in Yuxi City from 1995 to 2015

Based on multi-temporal remote sensing images, the vegetation information of Yuxi City in 1995, 2005 and 2015 was extracted by using the normalized difference vegetation index ( NDVI ), and the pixel dichotomy model was used to calculate the vegetation coverage ( FVC ). The spatial and temporal characteristics of vegetation coverage area distribution in Yuxi City in recent 20 years were discussed by selecting the mean value of vegetation coverage and the transfer matrix of vegetation coverage grade area. The results showed that the area of middle and high vegetation coverage in Yuxi was more than 50 %, and the overall vegetation coverage was improved in from 1995 to 2015. In terms of spatial distribution, the overall vegetation coverage shows that the vegetation coverage in the northeast urban agglomeration area and both sides of the western valley is low, while the vegetation coverage in the southwest mountainous area is large. In the future, reasonable policies should be formulated to rationally use natural resources to enhance urban vegetation coverage, optimize land use structure, and realize the healthy and sustainable development of Yuxi City.