On 12/05/2015 12:19, Martin Koppenhoefer wrote:
2015-05-11 18:14 GMT+02:00 Volker Schmidt <[email protected]
<mailto:[email protected]>>:
I only now, after having lived for many years in the UK, I realise
that the definition of gravel is wider than the equivalent of the
German Splitt. I thought them equivalent.
Looking it up in the English Wikipedia I found contradictory
information.
In
http://en.wikipedia.org/wiki/Gravel_road
"gravel" is "crushed stone" and raoughly aequivalent to the German
Splitt
But in
http://en.wikipedia.org/wiki/Gravel
"gravel" is more generic and can, for example, also be pebbles of
different sizes.
from my researches it seemed that gravel was completely different to
Splitt and wouldn't contain it. But I now have looked at yet another
dictionary and it seems to be included (because "pounded" is likely a
synonym for "crushed" here):
http://www.oxforddictionaries.com/definition/english/gravel
So my conclusion is that gravel can be either naturally worn or
crushed stone and is about the grain size. Please note that "Splitt"
is only appropriate for crushed stone, otherwise you would have to use
"Kies" (pebbles).
I'd agree that "it's all about the grain size". The wikipedia page*
that's already been linked mentions the Krumbein scale that I vaguely
remember from college.
When tagging surfaces in OSM I personally try not to use too many
different values - if there's something vaguely appropriate in the top
entries here I'd use that:
http://taginfo.openstreetmap.org.uk/keys/surface#values
note that that's the .org.uk taginfo not the .org one - there have been
relatively few imports and mechanical edits there so it's a better
representation of "what the surveying mapper actually tagged", though a
similar country taginfo for a country with few imports and mechanical
edits should do just as well.
Cheers,
Andy
* http://en.wikipedia.org/wiki/Grain_size
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