[OSM-talk] Extruded buildings

[Iván Sánchez Ortega]

El Monday 17 September 2007 11:38:14 SteveC escribió:
> > I think we need "building:stories=5" to keep track of the building
> > heights ;-)
>
> height=10
>
> (meters?)

IMHO, we should support both:

building:height=10m
 and
building:height=50ft


*But*, measuring meters (or feet, or yards, or lightnanoseconds[1])can be 
pretty challenging. OTOH I think that everyone is capable of counting how 
many stories (or floors) a building has.


El Monday 17 September 2007 11:41:59 Artem escribió:
> Sure, but the floor heights would differ from country to country :

I know, I know. In fact, they can vary a lot in the same city.

For example, Madrid has some buildings built in neoclassical/neo-baroque 
style[2][3][4] (up to 3 meters per floor), and beehive-like condos[5] (can be 
as low as 2 meters per floor)

In other words, I don't give a damn about the exact height of a building.


You may think "but we can estimate 2.2 meters per floor, and enter data into 
the building:height tag that way". However, you'll be entering (mostly) 
inaccurate data, when you could be entering accurate data about the number of 
stories/floors.


By the way: I really want to point out that the spanish cadastre stores and 
publishes information (as a WFS service[6]) about the number of floors that 
every part of a building has, with no attention to the height (meters or 
otherwise).


[1] 
http://en.wikipedia.org/wiki/List_of_unusual_units_of_measurement#Light-nanosecond
[2] http://flickr.com/photos/avoyali/1127851113/
[3] http://flickr.com/photos/magerit/1230684308/
[4] http://flickr.com/photos/madridx1306/1196588964/
[5] http://flickr.com/photos/madridx1306/299340093/
[6] 
https://ovc.catastro.meh.es/Cartografia/mapa.aspx?del=28&mun=900&refcat=2955708VK4725F
[7] For those who've seen [6] and are wondering where the number of floors 
are, please note that they're on roman numerals. e.g. "-I+IX" means "one 
basement, nine floors"; "VI+TZA" means "six floors, plus a terrace on top".



I think I'll be proposing "building:stories=number" soon.

Cheers,
-- 
Iván Sánchez Ortega <ivansanchez at escomposlinux.org>