耕作信息直接影响沉积物运移、磷素淋失和农业土壤的持水能力。遥感技术能够提供广大地区有关耕作措施的信息。美国农业学家P．H．Gowda等人用6种基于地球卫星专题绘图仪(TM)的对数模型来区别明尼苏达河下游流域的传统耕作措施和保护耕作措施，对来自TM数据所绘制的耕作图，用? Tillage information directly affects sediment transport, phosphorus leaching, and water holding capacity of agricultural soils. Remote sensing technology can provide information on farming practices across a broad area. American agricultural scientist H. Gowda et al. Used six logarithm models based on the Earth’s satellite thematic plotter (TM) to discriminate between conventional tillage measures and conservation tillage measures in the lower Minnesota River basin. For the tillage plots drawn from TM data,