Bobb Thanks you very much for detailed answer. I'll have to place the parts of lines in various layers. There is no other elegant decision as i understood, but I wonder how "web-map-giants" like GOOGLE or OSM get out of this scrape. >Vladimir, > >I’ve faked this in the past by drawing the same layer many times in one pass >(inside of the same mapfile), you need at least one complete layer pass, with >other partial layers for the over/under situations. You can do the partial layer grouping with attributes on the segments that need to go under or over, and this is a manual process for the most part, but it’s a real pain to keep that up to date over time (I’m talking over years) . I could probably find a programmer that thought of this as a challenge, but you still need a human to decide what is over something else as a last QA. > >The much harder task is defining which layers (partial segments are over/under >other layers.. You need to remove some line segments form at least one of the >layers in order to make things display correctly. Sometimes a layer is over, sometime it’s under. I actually have two instances in my mapping system, where I have three different bridges stacked on top of each other, two of them a roadways, with the odd one in between them. The other has a Railway bridge over a roadway bridge crossing. > >The z-index stuff has always been a painful thing thing to keep updated, but >it is doable. > >I’ve rencetly been looking at this myself for hardcopy pringing purposes. As >well. > >Bobb
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