<div dir="ltr"><div><div><div><div>Querying runway lengrh from
the database - sorry I missed this proposal.<br><br></div>I see three problems:<br><br>What about small airport next to big one - how it should be guessed who operates which runways?<br></div>As both are mapped as nodes it is necessary to guess.<br><br></div>Writing query to calculate it is not trivial (for start - runway may be segmented and consist of multiple <br>ways).<br><br></div>It is possible that such query will be too expensive to run it as it would degrade performance of <br>rendering server.<br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-01-03 14:54 GMT+01:00 Christoph Hormann <span dir="ltr"><<a href="mailto:chris_hormann@gmx.de" target="_blank">chris_hormann@gmx.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Saturday 03 January 2015, Mateusz Konieczny wrote:<br>
> - introducing new key that would allow to decide whatever<br>
> airport is important or not<br>
<br>
</span>Independent from this particular problem manually tagging importance<br>
ratings is a really bad idea. Importance of a feature is nearly always<br>
a multi-criterion quantity. To make such a rating verifiable would<br>
require to have a recipe to calculate it from other observable facts -<br>
and then it is better to tag these facts rather than the combined<br>
rating calculated from them.<br>
<br>
As i have said on github the runway length would be a fairly good<br>
criterion for importance and it is very widely available already (35551<br>
nodes aeroway=aerodrome with 31752 ways aeroway=runway). The problem<br>
here is not having this information mapped i think but querying it from<br>
the rendering database.<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Christoph Hormann<br>
<a href="http://www.imagico.de/" target="_blank">http://www.imagico.de/</a><br>
<br>
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