Re: [Tagging] Tagging communication transponders

[John Smith]

Here's a sample tower I produced, I'd appreciate any comments about
the tags I used if there is better ones I didn't notice


sample.osm
Description: Binary data
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[Tagging] Tagging communication transponders

[John Smith]

The ACMA (Australian Communications and Media Authority) just released
a data set of communication transponder locations for TV and radio
station, a lot of these share the same mast/tower however this
proposed feature suggests using multiple nodes to indicate multiple
transponders but this doesn't seem like a good idea to me:

http://wiki.openstreetmap.org/wiki/Proposed_features/Communications_Transponder

One tower in Sydney has 17 different transponders listed at the same location:

http://www.nearmap.com/?ll=-33.820111,151.185026z=20

Does anyone have any suggestions to cleanly tag these other than a
single node + multiple relations?

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Re: [Tagging] Tagging communication transponders

[John Smith]

On 18 May 2010 13:05, Roy Wallace waldo000...@gmail.com wrote:
 Separate entities should be represented by separate OSM elements.
 Relations are groups of objects in which each object may take on a
 specific role, so I don't think this is appropriate here.

You are grouping transmitters/transponders to a tower, and while it
may not be 100% appropriate from the original intent of relations,
until or unless something better comes along this is the best option
that I can see to tag a single node with multiple types of the same
types of information.

 I think the proposal to use a node for each transponder is right. They
 will only be placed at the same position if one is directly above the
 other - this is a limitation of mapping the world in 2D.

This information isn't just useful for rendering, it can be useful to
know to plan trips among other things, but before either can happen
the information needs to be encoded in such a way to make this sort of
thing easy to deal with and at present there isn't any easy way to do
it other than using multiple relations linked to a single node.

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