basic DEM processing algorithms to compute flow direction and flow accumulation, although in WMS this is done with a program called TOPAZ. The drainage menu in WMS also gives the user the ability to vectorize data (Basins->Polygons), and compute the basin data (Compute Basin Data).
Figure 3.15: WMS Drainage Toolbar
Figure 3.16 shows the editing tools that are included in the DEM module. Among these tools are a draw flow path tool, in which a flow path will be traced across the DEM from point to point according to the flow direction grid. Additional tools include point, vertex, arc and polygon selection and creation tools, a measuring tool, and an upstream arc selection tool.