[Tagging] Surveillance camera angle
Volker Schmidt
voschix at gmail.com
Wed Dec 29 10:07:02 UTC 2021
Just a little note of caution: we have plenty of new traffic surveillance
cameras installed by the municipality. Many of them have darkish inverted
glass domes that made me assume they are 360° cameras. I recently had a
bicycle accident near one of them and asked the police for the photos. I
learned that inside these domes there are conventional directional cameras
whose direction is changed from time to time by the operator. Conclusion:
be careful with camera properties.
On Wed, 29 Dec 2021, 05:13 Graeme Fitzpatrick, <graemefitz1 at gmail.com>
wrote:
> I take it you've been looking at this proposal which never actually went
> through?:
>
> https://wiki.openstreetmap.org/wiki/Talk:Proposed_features/Extended_tags_for_Key:Surveillance#Field_of_view.2C_height.2Fdirection.2Fangle_-_tagging_camera_and_sensor_alignment_and_mobility..._how.3F
>
> Been doing some looking, & according to TI, there are ~107000 uses of
> surveillance:type=camera, but beyond that proposal, there doesn't appear to
> be any definition anywhere of cameras, mounts, directions, angles or
> anything else to do with them!
>
> Looking at the proposal, direction 0-360 is pretty straight-forward to
> show the compass direction the camera is pointing, from 0 (due North), all
> the way back around to 360 (also due North).
>
> Angle 0-180 has me a bit confused though? I'm guessing the OP was working
> on the angle that the camera is looking vertically, from vertically
> straight down to straight up, but 0-180 doesn't really make sense?
>
> Elevation angles like that would usually start with 0 as the camera facing
> directly, horizontally forward, increasing from 0 degrees elevation through
> to 90 as it elevates to pointing vertically upwards, while 0 - -90 is the
> same thing in reverse as it depresses till pointing vertically down.
>
> There have been a few questions raised on the proposal over the years, but
> the OP apparently hasn't been on deck for ~11 years, so I don't think
> they'll be working on it anymore!
>
> Sounds like a good project for somebody to restart in the New Year! :-)
>
> Thanks
>
> Graeme
>
>
> On Wed, 29 Dec 2021 at 01:08, Cascafico Giovanni <cascafico at gmail.com>
> wrote:
>
>> Hello List,
>>
>> I need some clarification about the meaning of "camera:angle" tag,
>> somewhere defined in range 0-180.
>>
>> Is value the elevation angle? (90=horizontal)
>> Is value horizontal field of view?
>>
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