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利用3S技术对水土流失相关因子信息进行快速、准确提取。在ArcGIS中对多源数据进行集成,用空间分析模块在DEM上提取坡度坡长因子层,根据区域内各代表站R值用反距离法内插生成降雨侵蚀力层,利用不同土壤类型的K值转换生成土壤可蚀性层,以及利用不同土地利用类型的CP值转换生成水土保持因子层;通过GPS野外采点检验DEM与相关信息明确精度。最后实现区域两时期水土流失量的估算与监测。以金沙江中段的龙川江和勐果河两个子流域为试验区的研究表明,该方法能快速、准确地实现流域水土流失现状调查和动态监测,能适时掌握区域水土流失的时空变化,可为水土流失治理和水保规划制订和实施提供科学依据。
Using 3S Technology to Quickly and Accurately Extract Soil and Water Loss Related Factor Information. In ArcGIS, multi-source data are integrated, spatial analysis module is used to extract the grade factor of slope slope on DEM, and rainfall erosive layers are generated by inverse distance method according to the R value of each representative station in the area. Using K Value conversion to generate soil erodibility layer, and the use of different land use types of CP value conversion to generate soil and water conservation factor layer; through the GPS field inspection DEM and related information clear precision. Finally, we can estimate and monitor the amount of soil and water loss in the two periods of the region. The research on the two sub-basins of Longchuanjiang and Mengguo rivers in the middle of the Jinsha River shows that this method can quickly and accurately investigate and monitor the status of soil and water loss in the basin, and can grasp the spatial and temporal changes of soil and water loss in a timely manner. Soil erosion control and planning and implementation of water conservation planning to provide a scientific basis.