SPATIAL-TEMPORAL INFORMATION EXTRACTION FOR VEGETATION PHENOLOGY VARIATION BASED ON MODIS NDVI DATASETS IN THE TIBETAN PLATEAU

Vegetation phenology change is one of the most sensitive and direct indicators of global climate change.It is very important to make an accurate understanding of the spatial and temporal of vegetation phenology variation in the Tibetan Plateau.Based on MODIS(Moderate-Resolution Imaging Spectroradiometer) NDVI (Normalized Difference Vegetation Index) data from 2001 to 2013,we studied the extraction models of the vegetation phenology in the Tibetan Plateau with maximum change slope method. After the analysize of 13 years vegetation phenology,the results showed that(1) the vegetation phenology in the Tibetan plateau showed obvious spatial distribution mle from the southeast to the northwest.(2) alpine steppe started to grow when the temperature reached 5 C (3) there was no obvious change in the the start of growing season(SOS) in the Tibetan Plateau over the past 13 years as the end of seanson(EOS) following a more complex change.(4) Vegetation phenology obtaining from remote sensing were different from the traditional sense of the phenology.