W dniu 16.08.2015 1:27, Friedrich Volkmann napisał(a):
No, because the landcover=* key is just nonsense. There is no
definition for
http://wiki.openstreetmap.org/wiki/Landcover
that key. What does landcover mean? Vegetation? Soil? Atmosphere?
Buildings?
Ocean? Everything we map is landcover in some respect. You could use
landcover=motorway instead of highway=motorway, and
landcover=playground
instead of leisure=playground. The landcover key matches all and
nothing.
Somebody has just suggested that one should tag the lawns as landuse
because everything is "use", so this key can be stretched too.
Furthermore, landcover=trees cannot serve as a substitute for
landuse=forest
or natural=wood, because forests/woods not only consist of trees, but
also
of shrubs, herbs, fungi, mosses, lichens, algae, animals, water, soil,
gases, and diaspores.
Of course this is not a substitute for the forest and I try to be clear
that I don't like it to be used as a general type.
If you know it's a forest, you should tag it accordingly (once we have
definition again). But if all you know is "there are some trees", you
don't know if there are all these things, so you can safely tell only
about what you know, hence landcover=trees is what you really know.
If you cannot decide between landuse=forest and natural=wood, take
either
one. Just like picking a tracktype.
Last resort in case of doubts should be something more general, even
partially, not rolling the dice! Of course that's what people do now,
but we're discussing here to help them avoid such wicked games with
database.
***
Your questions about what lancover really is made me read the wiki and
it seems it's just a twin for "surface", which "is meanwhile also used
to indicate the surface type of larger areas, like for a Landuse but is
generally used as a secondary tag."
This means more or less that maybe surface=trees would be good, however
people use it very infrequently and I don't know if it is "primary" or
"secondary" tag then:
http://taginfo.openstreetmap.org/tags/surface=trees
http://taginfo.openstreetmap.org/tags/?key=surface&value=bushes%2Ftrees
--
"The train is always on time / The trick is to be ready to put your bags
down" [A. Cohen]
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