On 12.07.2014 01:01, Martin Koppenhoefer wrote:
>> Am 12/lug/2014 um 00:27 schrieb Friedrich Volkmann <[email protected]>:
>>
>> My proposal
>> http://wiki.openstreetmap.org/wiki/Proposed_features/natural%3Drock_cleanup
>> has been in RFC state for a year
>
>
> Maybe a whole year is a bit long...
>
> 3 comments:
> - you write natural=bare_rock is about rock as the surface material, so I
> think this would better fit in the keys "surface" or "landcover"
That's how natural=bare_rock is defined ("areas made principally or mostly
of solid rock"), analogous to natural=water/sand/grass/glacier/etc. all of
which are about the surface. The bare_rock proposal was approved 2 years ago
and there are 64 566 occurrences by now.
> - the distinction between stone and rock as the latter being firmly attached
> to the bedrock might often be difficult to verify on the ground
When in doubt, tag what seems most certain. That's natural=rock in most
cases. Estimations and guesses are daily business in mapping. Like guessing
tracktypes and landuses when mapping from arial images.
> -I don't like that "rock" can mean one rock or a group of rocks with at least
> one of them attached.
> If we are to bring in more detail, why not distinguish between one rock and a
> group of rocks?
See the last picture in my proposal. Is it one rock or two? You cannot tell,
because there are firmly attached to each other. If you map 2 rocks, how do
you tag the name? The name "Franzosenstein" belongs to the whole rock
formation alltogether. There's also a formation of 7 rocks called "7
Kurfürsten". It would be highly impractical to map them separately. This
kind of micro mapping should be possible, but not obligatory.
> And shouldn't from the group of rocks those that are not firmly attached to
> the ground be tagged "stone" according to your proposal and hence left out if
> the rock-tag?
You surely know the German term "Wackelsteine". A wackelstein consists of
one bottom rock connected to the ground, and one or more (more =>
Doppelwackelstein) rocks on top. They are commonly considered one single
rock formation, and therefore it should be one single object in OSM as well.
I use to map them as natural=rock, not stone, because the formation as a
whole is connected to the ground.
According to its wiki page, natural=stone is "a single notable freestanding
rock". This obviously does not apply to wackelsteins, because they are
neither single nor freestanding.
natural=stone is mainly intended for erratics, which are almost never
accompanied by rocks connected to the ground.
--
Friedrich K. Volkmann http://www.volki.at/
Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria
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