Interesting questions! The way I see it, we don't need to get into the details of who owns it (whether it is a company or the government), but classify according to it's use.
When I say airport, I mean the kind of aerodrome the average person can use, usually with some stores and airflight companies. We could use "aerodrome=domestic" for normal airports instead of "aerodrome=public", to avoid the need to consider who owns it. Most international airports in Brazil actually have "internacional" in it's official name. It means they have regular international flights. There are some "normal" airports that may receive international flights when *needed*, but they aren't known as international and I don't think they should be tagged as such (though they are classified as "international alternative" by the government). In my POV, an aerodrome with "aerodrome=private" would be an aerodrome used exclusively for transporting goods or people related to a company, or or privately owned by a big farm. I think ideally these shouldn't be tagged as "aerodrome=international", even if it's the case. I believe "aerodrome=military" is self-explanatory, i.e. used for military operations and/or research. I'm not sure about other types of aerodrome=*. I don't know that much about this. I'm sure there can be other cases that don't easily fit with what I mentioned. 2014-07-02 14:05 GMT-03:00 Martin Koppenhoefer <dieterdre...@gmail.com>: > > 2014-07-02 18:32 GMT+02:00 John Packer <john.pack...@gmail.com>: > > An airport is a special kind of aerodrome, and I think it is poorly >> documented on the wiki how to tag it. >> > > > From previous discussions I think I remember that it isn't clear what an > "airport" is. Most if not all our "aerodromes" are probably airports, and > also the helipads are probably airports according to the wikipedia > definition of airport. > > > > >> Looking at taginfo, it becomes clear that international aerodromes can be >> tagged with aerodrome=international. I assume most (if not all) >> international aerodromes are public airports. >> > > > What does an airport make "international"? If there once has flewn an > aircraft into another country? Or must there be a scheduled flight into > another country? Or a certain amount of such scheduled flights? > > > >> Private aerodromes (common inside some farms in Brazil) would be >> aerodrome=private, and military aerodromes would be aerodrome=military. So >> far so good. >> > > > is "private" about the ownership? Have a look at Fraport AG, the operator > of Frankfurt Airport (biggest German airport) and traded at Frankfurt Stock > Exchange. http://en.wikipedia.org/wiki/Fraport it is both, publicly and > privately owned (majority is public ownership currently), would the > Frankfurt Airport become private in OSM if the government decided to sell a > bigger share of it? > "airport=international;private"? > > Previous discussions ended up with the conclusion that it would be better > to have the details mapped (e.g. number and size/shape of runways, > encompassing polygon (!) for the airport itself) so that you could > elaborate this information to estimate the importance. Unfortunately it > seems quite expensive to do this on the fly, hence the missing progress in > airport rendering at low zoom scales so far. That's why I agree with you > that some basic tags could help the renderer (e.g. osm-carto) to achieve > better rendering. > > Even a very simple metric (airports bigger than x and mapped as an area) > might already improve the current rendering situation. > > cheers, > Martin > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
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