[Tagging] Feature Proposal - RFC - Extended tags for Key:Surveillance
John F. Eldredge
john at jfeldredge.com
Thu Feb 14 18:27:48 UTC 2013
Frank Villaro-Dixon <frank at villaro-dixon.eu> wrote:
> On 14/02/13 16:53, Martin Koppenhoefer wrote:
> > 2013/2/14 Frank Villaro-Dixon <frank at villaro-dixon.eu>:
> >> it's been some years now that this proposed feature has been in the
> >> 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
> >> cameras in OSM.
> >> Let me know if you have things to say ;)
> > 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..)
> -Guard would be more for surveillance things: power plants, etc..
> Of course, normally, every building that would have a Guard, would
> have a Barrier:personnel
> What do you think ?
> > 2. Isn't there one parameter missing to deduct the actual area
> > 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
> > 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
> 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 -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria
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