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<p>Let's separate the tagging from the rendering, like we are supposed to do.</p>
<p>Firstly, the tagging: how do we model an aerodrome.</p>
<p>There are so many ways of classifying aerodromes. From a pilot's perspective, there are at least the physical aspects (how long/wide is the runway?), the aviation facilities (instrument approaches etc) and the ground facilities (refuelling, repairs, customs, ...). Then there are dimensions like movements per year, military/commercial/GA, etc.</p>
<p><a href="http://www.airfieldcharts.com/airportcategorisation.htm">http://www.airfieldcharts.com/airportcategorisation.htm</a></p>
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<p>Each one of these dimensions can (should!) be represented independently in OSM. They are objective and verifiable.</p>
<p>But now, the question is what combinations of these attributes should be rendered in a specific way? Pleasing to whose eyes?</p>
<p>C.</p>
<p>On 2019-05-20 14:10, Joseph Eisenberg wrote:</p>
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<div class="pre" style="margin: 0; padding: 0; font-family: monospace">How should we classify different types of aerodromes?<br /> <br /> We can already distinguish private aerodromes with the access tag<br /> "access=private" and military aerodromes with "military=airfield", and<br /> heliports have their own tag, but currently large international<br /> airports and tiny airstrips are not clearly distinguished.<br /> <br /> I believe we can make a reasonable distinction between major classes<br /> of aerodromes:<br /> <br /> 1) Airstrips without buildings or any other developed features<br /> <br /> 2) Developed general aviation aerodromes which do not offer any<br /> regularly scheduled public, commercial passenger service<br /> <br /> 3) Commercial airports which offer regularly scheduled commercial<br /> passenger service<br /> <br /> History:<br /> <br /> In the very early years of OSM, there were three types of features<br /> where planes could land: aeroway=airport for airports,<br /> aeroway=airfield for undeveloped airstrips, and aeroway=aerodrome for<br /> general aviation sites, if I understand the history correctly. These<br /> were rendered differently back in 2008, it appears, based on the old<br /> discussion in the talk pages.<br /> <br /> However, at some point all of the aeroway=airport and aeroway=airfield<br /> features were edited (I don't know if it was done over a few months or<br /> all at once) to aeroway=aerodrome, which was defined to mean any place<br /> where aviation operations regularly take place, except for military<br /> airports, which are tagged miltary=airfield.<br /> <br /> Unfortunately, while this may work for pilots and aviation usage, it's<br /> not very sensible for general mappers. Some mappers have used<br /> aeroway=airstrip for small airfields without buildings or any other<br /> developed features, so that they will not be rendered. Others have<br /> proposed tags to specify the type of aerodrome.<br /> <br /> The oldest classification system used "type=*" but this conflicts with<br /> the key used for relations such as type=multipolygon.<br /> <br /> Another option was "aerodrome:type=" which has been used a couple of<br /> thousand times, but has not been clearly defined:<br /> <a href="https://wiki.openstreetmap.org/wiki/Key:aerodrome:type" target="_blank" rel="noopener noreferrer">https://wiki.openstreetmap.org/wiki/Key:aerodrome:type</a><br /> <br /> The most recent proposal in 2014 suggested using "aerodrome=*" which<br /> seems to fit best with the usual way of tagging the type or main<br /> classification of a feature.<br /> <a href="https://wiki.openstreetmap.org/wiki/Proposed_features/Aerodrome" target="_blank" rel="noopener noreferrer">https://wiki.openstreetmap.org/wiki/Proposed_features/Aerodrome</a><br /> <br /> I think this last option should be developed further, but we need to<br /> decide which values of "aerodrome=*" are viable.<br /> <br /> Mainly I'm interested in places with or without regular passenger<br /> service, since this is of greatest interest to most map users, but<br /> perhaps there could also be specific tags for cargo-only aerodromes<br /> and other specialized facilities.<br /> <br /> _______________________________________________<br /> Tagging mailing list<br /> <a href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a><br /> <a href="https://lists.openstreetmap.org/listinfo/tagging" target="_blank" rel="noopener noreferrer">https://lists.openstreetmap.org/listinfo/tagging</a></div>
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