Zeke Farwell <ezeki...@gmail.com> writes: > Classifying by runway length does make some sense to me, but I really have > no idea how Mapnik or any other renderer works. Not sure if this would in > fact be easy or not. It also means a renderer needs the runway tagged as a > way or polygon in order to make a decision. What is a renderer to do with > the many small airstrips that are just tagged with a node? Should it just > assume that they are minor and only render them at a low zoom? This could > work….
In general I would like to see OSM adopt existing schemes for labeling. It seems in most cases of "how to map foo", there's a foo community that has already thought about this for reasons other than mapping. The hard part often seems to be reconciling various national schemes. That said, I'm someone off plan in the following comments. Looking at airports, I don't think it's that hard major_international: constant customs and immigration plus below. Most of these are known within the whole country. major: those with controlled airspace and a tower, constant TSA/etc. presence, and usually serious amounts of comercial traffic. These are known to most people within the surrounding states. minor: airports with commercial traffic, but which are clearly secondary by reason of only having TSA checkpoints operating when flights are scheduled. (Hanscom, MA and Trenton, NJ). Everyone within an hour's drive knows about them. general_aviation: general aviation aiports. This is more or less a legal term in Massachusetts, and I think it's similar. These airports are available to the public to take off and land from 24/7, but typically do not have normal scheduled passenger flights operated by carriers. They typically have sightseeing and flight instruction. They are typically at least 10 miles apart from each other, but not always. Most people in the surrounding few communities know where they are. restricted: "private restricted landing area" (Massachusetts term, but general concept). This is a place where planes can land and take off but permission is required. Many people have no idea they exist. (we already have military tags for air force places) I don't think there's a real need to express that Boston Logan is more important than Manchester in terms of size. The important thing and the problem at hand is to omit private strips and then general aviation appropriately. The above doesn't key that much off "international"; if you can fly 20 km to Canada from a tiny airport in Vermont, that doesn't make it important. For example, in http://osm.org/go/ZfIZyXB-- it's appropriate that Minuteman Airfield (general aviation) is shown. This seems ok up to zoom 10 or 11. But "Sid's Airport" probably should be shown only starting only at zoom 13, eg at http://osm.org/go/ZfIZyVr (Sid's is a grass strip behind a house with a tiny plane/ultralight in the garage.)
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