[talk-au] Audible fences
61sundowner at gmail.com
Tue Aug 3 10:56:55 UTC 2021
On 1/8/21 7:09 pm, Bob Cameron wrote:
> Hi Warin
> Stock or pest control barriers that are somewhat replacing (and
> sometimes doubling up on) road cattle grids.
> The ones I have mapped commonly comprise a fence line very close to
> (both sides of) the road edge of maybe 5-10m length and parallel, then
> two audible sonalert boxes (often with a solar panel/supply) at one
> end, or middle off the close in fence. The boxes are usually mounted
> on poles less than a metre high but I have seen some attached to the
> fence hardware.
I'd map the fence, if it exists, separately. One physical object = one
OSM entry... Of course like many things the mapper may cose to simply
not map that but map the audio thing.
> Some confining fence lines I have seen are angled rather than parallel.
> Any stock or pest that wants to wander through gets channelled onto
> the narrower road between the fences then blasted with sound when it
> gets within maybe 5 metres. Vehicles also set off the alarms from
> perhaps 20-30m away. Some (less than 10%?) of the barriers have sound
> warning signs.
> In terms of a driving hazard there is the quite loud high frequency
> sound and no road shoulder at the barrier.
> Since they are becoming more and more common I'd like to see the
> consensus placed in the Aus taglines wiki
barrier=audio or some such as a node.
Easiest to map as a node on the road. More work to map as a node at the
location of each device. which would be to the side of the road and not
barrier:for=animal would make it clear to non ozie mappers.
Extra fluff with other tags like frequency=*, brand=* etc etc.
I wonder how cattle on cattle trucks handle it? Could leave a lot of
effluent on the departure sides.
> On 1/8/21 5:32 pm, Warin wrote:
>> On 31/7/21 8:59 am, Bob Cameron wrote:
>>> Info only
>>> ie the squeaking screeching fences that supposedly replace cattle
>>> grids. I asked for input some months ago on how to map.
>>> With the recent ID editor update there is now a warning that a fence
>>> has to be a line, even though it is placed on the road.
>> The OSM wiki also claims a fence must be a line.
>> What physically is this 'screeching fence'?
>> Is it in the middle of the road like a cattle grid, or along the edge
>> of the road?
>> A single pole with the device on it?
>> Or is it 2 poles on opposite sides of the road with devices mounted
>> one them?
>> Or is it a series of poles along both sides of the road with devices
>> on them?
>> While for simplicity using a node on the road is good for the mapper
>> it is not good for the data consumer when used as a 'fence'. I would
>> think it is more of a different kind of 'cattle grid'. If you want
>> something that 'works' then use barrier=cattle_grid with
>> method=acoustic, assuming this will be used instead of a cattle grid
>> and possibly a replacement in future ... square peg in a round hole.
>> Or come up with something new
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