On 07-Apr-17 04:16 AM, Paul Desgranges wrote:
The idea of the "size <https://wiki.openstreetmap.org/wiki/Key:size>"
attribute was to provide the length*height*width of the advertising
device itself (without the support), while the "height" attribute of
the advertising device gave the total height ("height above ground")
of the advertising device ("Height" previously had this meaning).
An object can have a portrait aspect with the same 'size' as a landscape
aspect. So 'size' conveys less information than having both height and
width.
Can we keep the "height
<https://wiki.openstreetmap.org/wiki/Key:height>" meaning generally
speaking : "height" is "height of the feature", but have a specific
meaning of "height" for advertising device : "height above ground" (if
it is clear and well explained in this context) ? And in that case use
the "size" attribute to provide the form factor of the advertising
device ?
No. the OSM definition of height should remain - less confusing that
way. And 'size' does not describe form factor.
If you want to define the height of the support structure then do so -
make a new feature or use an old one.
height:base=* for instance. This should be the height of the base only,
if the base is on top of a building then it is not the height to the
'ground'. Think it through.
Thanks
Le 06/04/2017 à 19:36, Martin Koppenhoefer a écrit :
2017-04-06 18:35 GMT+02:00 Paul Desgranges <[email protected]
<mailto:[email protected]>>:
If "height" is "height of the feature" and not "height above
ground", not a problem but how can we store this second height
"height above ground" ? For example for an advertising device ,
the display surface of the advertising is supported by legs, then
we need to distinguish the height of the surface dedicated to the
advertising from the height of the device including the support.
Classic advertising billboard is 4m width * 3 m height, and is
supported on 3 m legs , therefore the total heigth is 6 m.
yes, we'll need a tag for height above ground. There is min_height,
but it seems to require a building for some strange reason, and more
strangely, to redefine "height":
https://wiki.openstreetmap.org/wiki/Key:min_height
it really is a pity, it is the analogous problem of building:levels
which according to the wiki are not indicating the number of building
levels but the number of building levels plus some imaginary, non
existent building levels. It's really crazy.
Cheers,
Martin
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