Today was my first attempt at creating subregions on a topo surface. I was attempting to trace out roads, forest extents, and fields from a satellite topo so there was no model geometry to pick out region boundaries. I was shocked by how poor the current procedure is to define subregions.
Each boundary has to be drawn twice, and the slightest overlap of these duplicate boundaries is rewarded with a "subregions cannot intersect" error. With a properly designed UI, this error would be impossible to generate. Instead of expecting users to tediously outline each subregion, the UI should simply accept a sketch of proposed boundaries. To the extent the user drawn boundaries form closed loops, subregions would be created from the boundary lines.
