What are the arrows for in the SDSFIE? What geometry type can I use for them?
The direction arrows (there are about 15-20 of them) are included in the SDSFIE but are “cartographic” ONLY. This means that there are no defined attributes and the specific structures are left up to the users. They are essentially “drawn” on the map to show flow, direction, slope, etc. They can be drawn as line strings, or captured as points (as in ArcGIS) where an attribute indicates the angle of the symbol shown at the point.
