[HOT] Identification of Communication towers
Pierre Béland
pierzenh at yahoo.fr
Sun Mar 15 13:18:02 UTC 2015
Good idea Mike. If somebody want to look at this.
A follow-up is coming where I give instructions for the Validation step where we will enhance the map.
Pierre
De : Mikel Maron <mikel.maron at gmail.com>
À : "bgirardot at gmail.com" <bgirardot at gmail.com>; spatialbits <spatialbits at posteo.net>; "hot at openstreetmap.org" <hot at openstreetmap.org>
Envoyé le : Dimanche 15 mars 2015 9h12
Objet : Re: [HOT] Identification of Communication towers
We could make a quick tracing guide for these towers. Just need a few clipped screenshots of the imagery, and help text.
Would put it together in something like this: http://hotosm.github.io/tracing-guides/guide/kulna.htmlhttp://hotosm.github.io/tracing-guides/
-Mikel
* Mikel Maron * +14152835207 @mikel s:mikelmaron
On Sunday, March 15, 2015 9:03 AM, Blake Girardot <bgirardot at gmail.com> wrote:
Hi Martin,
These are challenging to spot and hard to tag correctly without local
knowledge I just discovered.
http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dcommunications_tower
I usually find towers by seeing the shadow they cast, that is the big
indicator to me.
Here are a few examples in the region:
https://www.openstreetmap.org/#map=19/-21.90198/166.072485
If you look very carefully at the shadow you can see the microwave
transceiver drums in the shadow. I would guess that is what helped the
person identify this one as a "communications" tower specifically.
----------------------------
https://www.openstreetmap.org/#map=19/-20.748846/167.262194
That one again, shows the shadow being a pretty big factor. And it also
show a typical service road and pad. I do not know how the mapper knew
it was a communications tower.
------------------------------
https://www.openstreetmap.org/#map=19/14.977132/120.52743
Shadow and microwave drums visible
-----------------------------------
https://www.openstreetmap.org/#map=20/15.011183/120.532604
Shadow and service area fenced off.
----------------------------------
https://www.openstreetmap.org/#map=19/15.097711/120.611481
A nice big TV transmission tower.
I hope those help!
Cheers,
Blake
On 3/15/2015 11:37 AM, spatialbits wrote:
> Hi hotties,
>
> as part of tasks #944/943 (Vanuatu) mapping of Communication towers is
> requested.
> Could someone point me to an example in the imagery (e.g. lat/lon), so I
> get an idea on what to look for.
>
> Thanks.
>
> Martin
>
> _______________________________________________
> HOT mailing list
> HOT at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/hot
>
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