Response of normalized difference vegetation index in main vegetation types to climate change and their variations in different time scales along a North-South Transect of Eastern China Applying generalized additive model to integrate digital elevation model and remotely sensed data to predict the vegetation distribution Normalized difference vegetation index dynamic change and its driving factor analysis with long time series in the Jinghe River watershed on the Loess Plateau of China Vegetation change and its response to climate change in Central Asia from 1982 to 2012