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By using monthly precipitation data and standardized precipitation index (SPI), combining the normalized difference vegetation index (NDVI) data and historical statistical data of drought area, the drought trend of Gannan region from 1965 to 2013 was analyzed. The results showed that: (1) from 1965 to 2013, the drought index in study area rose firstly (1965–1976) and leveled off (1977–1989), then...
Based on the dimidiate pixel model and remote sensing technique, a new alpine grassland vegetation coverage analysis model on the basis of NDVI index was built and the fractional vegetation coverage was estimated in Gannan state in year 2000, 2002, 2004, 2006, 2008 and 2010 from MODIS data. Thus, the character of dynamic changes of the grass vegetation coverage was figured out with the varied 5 levels...
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