Frank Villaro-Dixon <fr...@villaro-dixon.eu> wrote: > On 14/02/13 16:53, Martin Koppenhoefer wrote: > > 2013/2/14 Frank Villaro-Dixon <fr...@villaro-dixon.eu>: > >> it's been some years now that this proposed feature has been in the > draft > >> section. > >> I think it's now the time to RFC on this feature, what do you think > ? > >> > >> The future goal is to starting to import/add correctly the CCTV > public > >> cameras in OSM. > >> > >> Let me know if you have things to say ;) > >> > >> > https://wiki.openstreetmap.org/wiki/Proposed_features/Extended_tags_for_Key:Surveillance > > > > > > Nice, finally the open burglary map comes closer ;-) > Nah, it shouldn’t be seen that way ;) > > I have 2 remarks: > > > > 1. regarding guard there might be some overlap with this tag: > > http://wiki.openstreetmap.org/wiki/Key:barrier:personnel > Well, the two are a bit different, I think: > -Barrier would be for "entrances" (UN, consulates, etc..) > whereas > -Guard would be more for surveillance things: power plants, etc.. > > Of course, normally, every building that would have a Guard, would > also > have a Barrier:personnel > > What do you think ? > > > > 2. Isn't there one parameter missing to deduct the actual area > covered > > by a camera? I'd think you needed 3 values: direction the camera > > points to (in 3d, e.g. azimuth and altitude) plus the field of view > > or focal length. This is of course purely theoretical because the > > cameras might be able to move and most mappers won't probably be > able > > to add high precision orientation data (usually you will have to > > estimate these values). > Yep, haven't thought of that. > Usually, site who represent these cameras > (eg: http://www.sous-surveillance.net/) > have and approximate view of the camera based only on the orientation > of > the camera. > > focal length (camera:focal ?) isn't a bad idea, but I think that the > most important tag is camera:direction. > > > > cheers, > > Martin > >
I would think that information such as focal length would be difficult to learn; the security authorities, whether private security or police, would be justifiably reluctant to disclose that information. If the camera is inside a dark or mirrored dome, you may not even be able to tell which direction it is aimed. -- John F. Eldredge -- j...@jfeldredge.com "Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
