3Bradley C R. The influence of canopy green vegetation frac- tion on spectral measurement over native tall grass prairie [J]. Remote Sensing of Environment, 2002, 81 (1); 129-135.
7Graetz R D, Pech R R, Davis A W. The assessment and monitoring of sparsely vegetated rangelands using calibrated Landsat data. International Journal of Remote Sensing,1988, 9(7):1201～1222.
8Dymond J R, Stephens P R, Newsome P F et al. Percent vegetation cover of a degrading rangeland from SPOT.International Journal of Remote Sensing, 1992, 13(11):1999～2007.
9Wittich K P, Hansing O. Area-averaged vegetative cover fraction estimated from satellite data. International Journal of Biometerology,1995, 38(3): 209～215.
10Quamby N A, Townshend J R G, Settle J J et al. Linear mixture modeling applied to AHVRR data for crop area estimation. International Journal of Remote Sensing, 1992, 13(3): 415～425.
