[OSM-talk] proposal: relation type=way_affected (on the beginning of the street)
Hallo. Just on the beginning of the private way is one of the common places for barriers. Its mapping makes an apparent clash between reality and mapping schematic - there is no way to mark this fact exactly. http://www.openstreetmap.org/?lat=50.071094lon=14.425607zoom=18layers=B000FFF You cannot draw the barrier just on the cross node - the main street has no gate, it's only on the private way. Drawing it on an additional node gives a bad assumption, that one should search a way with a gate say 10-20 meters from the cross. In fact one should search a gate just next to the street, with no part of the private way visible. Some renderers even render the barrier incorrectly inside the main street line. Just next to the cross point is a generic problem, which affects more features. I can imagine marking them as a new type of relation: Proposal: Relation way_affected type=way_affected ... set of feature tags valid for point (e. g. barrier=..., highway=stop,...) members: . node (recurrence: one) start point of way with barrier |_ way (recurrence: one or more) the way affected by the mark It is expected, that node is part of all way members. rendering: Render feature only on affected way(s) just next to the node independently on the map scale. Stanislav Brabec http://www.penguin.cz/~utx ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] proposal: relation type=way_affected (on the beginning of the street)
Rory McCann wrote: On 06/11/08 08:27, Stanislav Brabec wrote: Just on the beginning of the private way is one of the common places for barriers. Its mapping makes an apparent clash between reality and mapping schematic - there is no way to mark this fact exactly. http://www.openstreetmap.org/?lat=50.071094lon=14.425607zoom=18layers=B000FFF You cannot draw the barrier just on the cross node - the main street has no gate, it's only on the private way. Drawing it on an additional node gives a bad assumption, that one should search a way with a gate say 10-20 meters from the cross. In fact one should search a gate just next to the street, with no part of the private way visible. Some renderers even render the barrier incorrectly inside the main street line. I know what sort of feature you're talking about. But I would have thought that the barrier (or whatever) would be ever so slightly on the private way (eg 10cm in). Would it not make more sense to have a node veery close to the start of the private way? It would be OK, if OSM would exactly map the world, centimeter by centimeter. But the way is only a schematic one-dimensional object, so we also need a schematic method to mark just next to the way. Renderers have no idea about exact way width and attempt to render the barrier inside the schematic line of the main way (exactly on the place veery close to the start of the private way). Stanislav Brabec http://www.penguin.cz/~utx ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] proposal: relation type=way_affected (on the beginning of the street)
Renderers have no idea about exact way width and attempt to render the barrier inside the schematic line of the main way (exactly on the place veery close to the start of the private way). So the relation is to try and overcome a problem with the renderers, rather than a problem with mapping? I've just accepted that I can't zoom in close enough to show things as accurately as they might be mapped. It's a matter of scale. The post box icon for example often seems to overlap the way if it is actually next to the way, but then it may well also show as the same width as the way, which it clearly isn't in reality. I'm happy putting a node where the gates are (according to my GPS unit, and I've recently tagged a footpath that crosses a road and could clearly see where the gates needed to go, though I'd only got a single trace on each of the road and the footpaths taken with the same unit, so perhaps that helped). I think JOSM allows me to zoom in closer than the renderers do which might help with the positioning a bit. Ed ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] proposal: relation type=way_affected (on the beginning of the street)
On 06/11/08 08:27, Stanislav Brabec wrote: Hallo. Just on the beginning of the private way is one of the common places for barriers. Its mapping makes an apparent clash between reality and mapping schematic - there is no way to mark this fact exactly. http://www.openstreetmap.org/?lat=50.071094lon=14.425607zoom=18layers=B000FFF You cannot draw the barrier just on the cross node - the main street has no gate, it's only on the private way. Drawing it on an additional node gives a bad assumption, that one should search a way with a gate say 10-20 meters from the cross. In fact one should search a gate just next to the street, with no part of the private way visible. Some renderers even render the barrier incorrectly inside the main street line. I know what sort of feature you're talking about. But I would have thought that the barrier (or whatever) would be ever so slightly on the private way (eg 10cm in). Would it not make more sense to have a node veery close to the start of the private way? Rory signature.asc Description: OpenPGP digital signature ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] proposal: relation type=way_affected (on the beginning of the street)
On Thu, Nov 6, 2008 at 8:27 AM, Stanislav Brabec [EMAIL PROTECTED] wrote: Hallo. Just on the beginning of the private way is one of the common places for barriers. Its mapping makes an apparent clash between reality and mapping schematic - there is no way to mark this fact exactly. http://www.openstreetmap.org/?lat=50.071094lon=14.425607zoom=18layers=B000FFF You cannot draw the barrier just on the cross node - the main street has no gate, it's only on the private way. Drawing it on an additional node gives a bad assumption, that one should search a way with a gate say 10-20 meters from the cross. Well, yes, it's actually not where the two roads cross, as far as I'm concerned. Go stand in the very centre of the junction, right in the middle of the road. Can you touch the barrier with your hand? No, it's out of reach. How far from where you are standing? A few metres, usually - roughly the width of the road. So I don't see anything wrong with saying the barrier is a few metres from the very centre of the junction. And your suggestion, by comparision, is really overcomplicating things! Cheers, Andy ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
