Water flow routes over land (Urban Forest)

These flow routes are derived from the 2008 DEM surface using ESRI Spatial Analyst stream order tool with STRAHLER ordering. The GRID_CODE field represents stream order. Lines with no tributaries are assigned an order of one and are referred to as first order. When two first-order links intersect, the downslope link is assigned an order of two. When two second-order links intersect, the downslope link is assigned an order of three and so on. This was undertaken as part of the urbanforest program, the shapefile excludes a portion of Kensington that became part of City of Melbourne after this data was processed.

本次研究生成的河网路径源自2008年数字高程模型（Digital Elevation Model, DEM）地表，采用ESRI Spatial Analyst（空间分析）工具的斯特拉勒（Strahler）河网分级法生成。其中GRID_CODE（网格编码）字段用于表征河网分级等级。无支流的水系线段将被赋予1级，即一级水系；当两段一级河段交汇时，下坡方向的河段将被赋予2级；当两段二级河段交汇时，下坡方向的河段将被赋予3级，以此类推。本次河网路径的生成工作作为城市森林项目（Urban Forest Program）的一部分开展，该Shapefile（形状文件）未包含在本数据处理完成后并入墨尔本市的部分肯辛顿区域。