2Huete A, Justice C, Leeuwen W V. Modis Vegetation Index (MOD13) Version 3. Algorithm Theoretical Basis Document [EB/OL].Http://modis. gsfc. nasa. gov/data/atbd/atbd_modl3.pdf.1999.
3Gitelson A A, Kaufmn Y J, Stark R, et al. Novel algorithms for remote estimation of vegetation fraction[J]. Remote Sensing of Environment, 2002, 80 (1): 3457 -3470.
4Price J C. Comparing MODIS and ETM+ data for regional and global classification[J].Remote Sensing of Environment, 2003,86(4) : 18:35-1852.