[Tagging] message=*

[Warin]

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 <paul.desgranges at gmail.com 
>> <mailto:paul.desgranges at gmail.com>>:
>>
>>     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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