"3S"技术在沙质荒漠化土地动态监测中的应用

通过建立以单位面积内风蚀地或流沙面积所占百分比、地表植被覆盖度和地表景观为指标的沙质荒漠化土地类型和以沙质荒漠化土地变化幅度为指标的沙质荒漠化土地变化类型分类系统，采用1975年MSS卫星图像数据和1987年、2000年TM卫星图像数据为遥感信息源和野外验证相结合提取沙质荒漠化土地类型的方法，在MAPGIS系统支持下，对位于鄂尔多斯高原和黄土高原接壤地带的1：25万《东胜市》、《榆林县》幅沙质荒漠化土地进行了1975年、1987年和2000年的动态变化分析，得出了1975年至1987年沙质荒漠化土地呈发展状态、1987年至2000年和1975年至2000年呈逆转状态的结果。

"3S"TECHNOLOGY APPLICATION TO DYNAMIC INVESTIGATION OF SANDY DESERTIFICATION LAND

Through sandy desertification land types classification system based on the percentages of wind-scoured land or quicksand area, vegetation overlay and upper sight, is put forward the classification system for sandy desertification dynamic change types by sandy desertification dynamic change range. Using MSS satellite image data in 1975 and ETM image data in 1987 and 2000 as remote sensing information source, and with field validation, the sandy desertification land types is suggested in this paper. Under the support of MAPGIS system, we did the sandy desertification land types dynamic change research of the joint of ERKOS Plateau and Loess Plateau in 1975, 1987 and 2000, and drew the conclusion as: developing between 1975 and 1987, and reversed between 1987 and 2000,and the same between 1975 and 2000.