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ＧＩＳ像元地形因子的算法，是土壤流失量遥感监测中的关键技术。对于其算法原理、应用程序、应用结果和应用精度，本文作了介绍和讨论。经实际应用表明，ＧＩＳ像元地形因子算法虽比图斑地形因子算法的运算量大和较复杂，但它有较严密可靠、较高的应用精度和较好的自动化程度。因像元坡长几乎相等而忽视或视像元坡长因子为相同的常数，都将导致流矢邑监测的重大错误。
The algorithm of terrain factors of GIS pixels is the key technology in remote sensing monitoring of soil loss. For its algorithm principle, application program, application result and application precision, this paper introduces and discusses. The practical application shows that although GIS pixel topographic factor algorithm is more complex and computationally complex than the patchy topographic factor algorithm, it is more rigorous and reliable, has higher application precision and better automation degree. Due to the nearly equal slope length of the pixels and neglect of the same factors as long as the slope of the pixels are the same constants, this will result in a serious error in the monitoring of Sycamore.