[Tagging] tower types, cooling towers etc.
cmue81 at gmx.de
Fri Nov 10 04:44:09 UTC 2017
On Thu, Nov 9, 2017 at 4:35 PM, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
> I just noticed that the tagman_made=cooling_tower is deprecated.
> The template says the reason is on the deprecated features list, but actually there is no reasoning there.
+1. People are moving forward too fast without documenting their intermediate steps, leaving no space for proper result checking, or proper reasoning from a third party. This opens a gate for errors.
That said, I do not oppose the effort around classifying /man_made/ towers with the tower:type tag in general. E.g. have a look at . It summons different tower types just as tower:type does, but maybe not to the same extent.
> There are also other values for tower:type that contradict the man_made=tower definition.
This should be fixed, either way is possible, adjusting the def. or the values.
According to  there are clear definitions to differentiate towers from masts.
These defintions vary with the ones used in OSM wiki, however.
But  is not the holy grail either. E.g. it tries to
distinguish towers from buildings by assuming that all
buildings must be habitable. This is a dead end imho:
- there are habitable towers (e.g. eiffel tower had/has an apartment)
- towers are (informally) a subclass of buildings if other defs apply, see 
- towers, bridges and buildings are man_made /structures/,
if a /structure/ is defined as the result of building activity by man
Last bulletin is /not/ a pledge to introduce man_made=structure structure=(tower, bridge, house, ..) however. It seems most if not all objects tagged with man_made are structures (?). Hence /structure/ value would not serve well the purpose of a value: to discriminate objects into classes. It is rather synonym to /man_made/, the key itself or how it is used within OSM.
The key /man_made/ should be stressed, i.e. natural towers should not be tagged using man_made=tower.
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