On Thu, Jan 28, 2010 at 6:43 PM, Anthony <[email protected]> wrote: > On Thu, Jan 28, 2010 at 6:35 PM, Anthony <[email protected]> wrote: > >> On Thu, Jan 28, 2010 at 6:14 PM, Dale Puch <[email protected]> wrote: >> >>> So a bridge over a river or dug ditch is layer 1, and the water would be >>> 0 >>> >> >> What about a dug ditch without a bridge over it? Is that layer=0? It's >> certainly "open to the air surface", isn't it? So when the ditch is dug, >> the layer is 0, but then when I stick a plank on top of it it suddenly >> becomes layer=-1? >> > Open to the air was a poor way for me to describe it. Perhaps a slightly better way is if the only thing covering it is a "way" that crosses it. aka a bridge or overpass.
If it is more than that, picture a park and a road on top (as I imagine the below pic might be) then I would put the top as layer 0 > Oops, I totally misread that one. > > So 95 south at > http://www.aaroads.com/northeast/pennsylvania075/i-095_sb_exit_020_04.jpgwould > be tunnel=yes, layer=0? > > Or would it be left untagged altogether? > > Or something else? > Is it just a (very wide) road above? (layer 0) The road above would be Bridge=yes layer=1 Is it building or park above (with or without roads)? Tunnel=yes layer=-1 and the stuff above would be layer 0 -- Dale Puch
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