[Talk-us] [OSM-talk] Old Aerodromes

[Elliott Plack]

I am glad this conversation has restarted. A few of you, (Me, Paul,
others..) will recall a similar conversation on the openstreetmap-carto
repo a few years ago where I noted that there are simply too many of these
micro airports shown on the map. We discussed at great length how the
relative importance of aerodromes could potentially be used for rendering.

Given that map roulette is now handling these, I think this is a great time
to revisit this discussion. If maprouletters can change all these point
aerodromes to a polygon, then we can subjectively define airport importance
using the shape size.

Read up on GitHub:
https://github.com/gravitystorm/openstreetmap-carto/issues/1143


On Tue, Apr 12, 2016 at 1:42 PM Wolfgang Zenker <wolfgang at lyxys.ka.sub.org>
wrote:

> * Paul Norman <penorman at mac.com> [160412 17:27]:
> > On 4/12/2016 2:40 AM, Christoph Hormann wrote:
> >> On Tuesday 12 April 2016, Martijn van Exel wrote:
> >>>> I was mapping some rural area in the U.S. and noticed, not for the
> >>>> first time, an aerodrome node in the middle of a field where there is
> >>>> obviously no airport or airfield.
>
> >> I am not sure here.  For small airfields the aeroway=aerodrome feature
> >> is a fairly abstract thing essentially indicating only that this is a
> >> place where aircrafts start or land.  This is not generally something
> >> that can be reliably determined from imagery.
>
> > You can't reliably find small airfields from imagery, but I've found it
> > possible to verify a lack of airfields from it. I pass though
> > agricultural areas, and the airfields that are still active all appear
> > somehow on imagery, even if it's just an area where the ground cover is
> > different. On the other hand, some of the aeroway=aerodrome we have data
> > for include points in fields of corn, residential areas, and stands of
> > trees.
>
> One added problem here is that the coordinates of imported data are
> not always that good. As an example check Zortman Airport
> http://www.openstreetmap.org/node/1042048666
> The original import was more than half a mile off.
>
> Wolfgang
>
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-- 
Elliott Plack
http://elliottplack.me
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