关键词: 地质统计学, 纹理, 变异函数, 沙漠化, 沙地

Abstract: During the research on desertification for Wencang, Hainan Province, we found that there are two difficulties in monitoring desertification of this area comparing to the research about desertification of Northwest China. One is that the beach sandlot shows same spectral features with the inland desert, so, to use traditional spectral classification to discriminate them is impossible, accordingly we can't get the real desertification area; the other is that the desertification degree in this area is also difficult to grade directly from origin radiometric bands, and because current desertification area is mainly formed by excessively destroying, thus, the experiences for Northwest China desertification monitoring are not fit, we must find other measures to grade desertification degree. Based on spatial construction differences of sandlot types, the author firstly put forward using geostatistical texture to monitor desertification, using the variogram texture to increase the discrimination degree of different samples. The result suggested that the maximum likelihood classification based on the combination of variogram texture and spectral bands can perfectly partition the beach sandlot and the different grades of inland desertification, which prove that geostatistical texture is validate in the application of desertification monitoring.

Key words: Geostatistics, texture, variogram, desertification, sandlot