[Tagging] Highway property proposal "covered=yes"

Mike Harris mikh43 at googlemail.com
Thu Oct 29 08:58:30 GMT 2009


> -----Original Message-----
> From: tagging-bounces at openstreetmap.org 
> [mailto:tagging-bounces at openstreetmap.org] On Behalf Of Randy
> Sent: 28 October 2009 21:04
> To: tagging at openstreetmap.org
> Subject: [Tagging] Highway property proposal "covered=yes"
> I have run into several situations where a service road 
> extends under a covered area, such as a building.
> Layering is one way to tag the building/road system, but, 
> technically, it is not always a correct way. Example: a 
> building on the ground is at layer 0, associated with any 
> pedestrian ways leading to it. That building has a small 
> ground level footprint, a small shop, a stairway, and an elevator. 
> The second floor (first floor to many) extends over a much 
> larger area, and a service road/parking area is under that 
> floor, open on three sides, therefore not a tunnel. The 
> service road should also be at the same layer as the ground 
> floor and the pedestrian ways. The second floor is 
> contiguous, so separating the building into two pieces one at 
> layer 0 and one at layer 1 is also misleading. Unless the 
> building is mapped as a complex relation of stacked layers, 
> there is no appropriate way, that I'm aware of, to map this 
> situation. And, from aerial photography, it's guess work to 
> map the hidden layers, anyway. GPS surveys can also be questionable.
> I propose that an additional property for highway of 
> "covered=yes" be used for this and similar situations, where 
> a road extends under a building, roof attached to a building, etc.
> In addition to providing a proper tagging method, there is an 
> added benefit. There has been a continuing series of 
> rendering bug reports about roads being on top of buildings 
> rather than under them, independent of layering. This 
> property tag would also make it much easier for renderers to 
> render the way differently than on top of the building (or 
> other structure), independent of rendering sequence. My 
> proposed rendering would be parallel dashed lines with 
> transparent fill, similar to a tunnel, without the 
> entries/exits being drawn.
> --
> Randy
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