[Tagging] Problem with airport classification

[Christoph Hormann]

On Saturday 03 January 2015, Mateusz Konieczny wrote:
> - introducing new key that would allow to decide whatever
> airport is important or not

Independent from this particular problem manually tagging importance 
ratings is a really bad idea.  Importance of a feature is nearly always 
a multi-criterion quantity.  To make such a rating verifiable would 
require to have a recipe to calculate it from other observable facts - 
and then it is better to tag these facts rather than the combined 
rating calculated from them.

As i have said on github the runway length would be a fairly good 
criterion for importance and it is very widely available already (35551 
nodes aeroway=aerodrome with 31752 ways aeroway=runway).  The problem 
here is not having this information mapped i think but querying it from 
the rendering database.

-- 
Christoph Hormann
http://www.imagico.de/