1Richardson A J, Wiegand C L. Distinguishing vegetation from soilbackground information[ J ]. Photogrammetric Engineering and Re- mote Sensing, 1977,43 ( 12 ) : 1541 - 1552.
2Jordan C F. Derivation of leaf area index from quality of light on the foresr floor [ J ]. Ecology, 1969,50 (4) :663 - 666.
3Rouse J W, Haas R H, Schell J A, et al. Monitoring vegetation sys- tems in the great plains with ERTS [ C ]//Proceedings of third earth resources technology satellite - 1 symposium, Greenbelt NASASP - 351,1974:310 -317.
4Huete A R. A soil -adjusted vegetation index(SAVI) [ J]. RemoteSensing of Environment, 1988,25 (3) :295 - 309.
5Pinty B ,Verstraete M M. GEMI :A non - linear index to monitor global vegetation from satellites [ J ]. Vegetation, 1992,101 ( 1 ) : 15 - 20.
