土壤流失量遥感监测中GIS像元地形因子算法的研究

ＧＩＳ橡元地形因子的算法，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，都将导致流失量监测的重大错误。

ALGORITHM OF TERRAIN FACTORS OF GIS PIXIL IN MONITORING SOIL LOSS BY REMOTE SENSING

Algorithm of terrain factors of GIS pixel is the key technique in monitoring soil loss by remote sensing. The principle, the applied process and the applied results of this algolithm are introduced and its applied accuracy is discuced in this article. Although the algorithm of terrain factors of GIS pixel is more complicated, and its calculation is more complicated than that of contour terrain factors, it is more dependable, automatic and of a higher accuracy than the latter algorithm. Neglecting the slope-length factor of pixel or regarding it as the same constant value due to similar slope lengths of pixels would lead to bad mistakes in the soil loss monitortng.