MODIS BRDF reflectance data at the end of April 2004 was selected to make a desertification map base on topsoil grain size by using Gain Size Index at arid and semiarid Asia. After data processing, GSI was applied into desertification mapping, and we find that high GSI area distributed at the desert and its’ marginal area, degraded grassland, desert steppe. The desertification map was output according to the correlation between GSI and grain size distribution, the classification of desertification is no desertification, light desertification, middle desertification, and severe desertification. The result can manifest the soil degradation very well.
Jieying Xiao, Yanjun Shen, Tateishi Ryutaro
Source: Proceeding of The CEReS International Symposium on Remote Sensing, Maximization of the Use of Satellite Data for Understanding the Earth Environment, 2005.