I've been working with a polygon feature class that looks something like this:
Wherever two polygons of different types (shown above with different colors) meet there needs to be a thick dashed line between them. The solution so far has been to keep a separate feature class for the lines, which of course needs to be updated every time the polys change. This has gotten to be pretty tedious and is creating a lot of redundancy in our data. Is there any type of map layer that can be generated on-the-fly based on spatial relationships and attribute data of a feature class? I'm guessing a geometric network would be involved, but that's all I've got. Does anyone have any insights?
Yup that'll work just fine. That means you can ignore my second paragraph about using two copies of the layer. Just use the one copy in the TOC and follow the instructions in the link to set up symbol levels. This is identical to the kind of task they use in the example, where they style polygons to only show the border where it changes. :)