ArcGIS平台关于D8算法的介绍
ArcGIS 10.3:https://desktop.arcgis.com/zh-cn/arcmap/10.3/tools/spatial-analyst-toolbox/how-flow-direction-works.htm
ArcGIS Pro:https://pro.arcgis.com/zh-cn/pro-app/tool-reference/raster-analysis/flow-direction.htm
ASC Arc / Info ASCII网格文件说明
http://surferhelp.goldensoftware.com/subsys/subsys_ASC_Arc_Info_ASCII_Grid.htm
栅格转 ASCII
https://desktop.arcgis.com/zh-cn/arcmap/10.3/tools/conversion-toolbox/raster-to-ascii.htm
ArcGIS中的多流向算法MFD-md(秦承志老师的博客)
http://blog.sciencenet.cn/home.php?mod=space&uid=65307&do=blog&id=1129906