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采用基于AML的提取坡长值的新方法——最大溯源径流路径法,对贵州省毕节地区5个不同范围区域的DEM数据进行坡长值、地形因子的提取,并与基于AML的迭代累计坡长法和基于C++的迭代累计坡长法对提取坡长值的时间消耗、地形因子值进行了比较.结果表明:基于AML的最大溯源径流路径法能够实现修正的通用土壤流失模型(RUSLE)中坡长值、地形因子的提取,可达到与迭代累计坡长法相同的效果;与基于AML的迭代累计坡长法相比,该方法计算效率较高,大大减少了提取坡长值的时间消耗,可实现基于AML的坡长值、地形因子提取在大范围区域上的扩展;与基于C++的迭代累计坡长法相比,该方法计算时效和结果相当,程序编写简单,容易修改和调试,能更普遍应用于GIS用户.
A new method of extracting slope length based on AML, the maximum traceable runoff path method, was used to extract the slope length and topographic factors of DEM data from 5 different areas in Bijie region of Guizhou Province. Compared with AML-based iterative cumulative slope Long method and iterative cumulative slope length method based on C ++ were used to compare the time consumption and topographic factor values of the extracted slope length.The results show that the maximum traceable runoff path method based on AML can achieve the modified general soil loss model (RUSLE) Compared with the iterative cumulative slope length method based on AML, this method has a higher computational efficiency and greatly reduces the time consumption of the extracted slope length value. Therefore, Compared with the iterative cumulative slope length method based on C ++, this method can calculate the slope length and the extraction of the terrain factor over a wide range of areas. The method has the advantages of equivalent calculation of aging and results, simple programming, easy modification and debugging, and more Commonly used in GIS users.