Comparison of GIMMS and MODIS normalized vegetation index composite data for Qinghai-Tibet Plateau. Estimation of Provincial Spatial Distribution Information of Forest Tree Species (Group) Composition Using Multi-Sources Data Vegetation dynamics over 2000-2012 and its driving factors in Yanchi County, Ningxia Province Monitoring multiple cropping index using MODIS NDVI data- A case study of Bohai Rim Spatio-temporal patterns and driving factors of vegetation growth anomalies in Xinjiang over the last three decades