Research on Vegetation Cover Changes in Arid and Semi-Arid Region Based on a Spatio-Temporal Fusion Model

Vegetation dynamics in arid and semi-arid regions have an important impact on carbon cycle, water energy exchange at local, regional, global scales. Therefore, it is of great significance for scientists to grasp the changes vegetation cover timely accurately. Based this, applicability ESTARFM model complex terrain area Xinjiang was explored using Landsat MODIS data fusion, overall change characteristics (FVC) distribution patterns different terrains study past 15 years were analyzed by combining dimidiate pixel model, unary linear regression digital elevation model. The results show that: (1) NDVI fused Model has high consistency with real data, can be used subsequent FVC estimation. (2) From 2006 2020, inter a level as whole, average annual showed weak increasing trend fluctuation; there are obvious differences spatial distribution, which characterized north low south. (3) improved greater than degraded area, accounting 52.3% 47.7% respectively; (4) In range 2000 3500 m, slight degradation 25° 45° slopes south southeast slopes, rest improvement trend. ESTARFM-based enables monitoring areas over long time series. high, both serious phenomena.