I'm in favor of airstrips, but I would make airstrip a subcategory of runway. So tagging an airstrip as runway is not wrong if you don't know any better.
Anyway, is there a way to know if a runway is an airstrip from aerial photos? Is grass surface enough to make something an airstrip? Does this depend on the country/region? What if a grassy runway has a big light that helps landing, is it a runway then? What if there is a very small fee to land there. What's the line between them? Janko pon, 9. lis 2017. u 15:38 Dave Swarthout <daveswarth...@gmail.com> napisao je: > Just to add some observations about Alaska to this conversation. Alaska > has hundreds of long strips whose surface is gravel or grass long ago > cleared of woods and brush that served as landing strips for small > airplanes. The small airplane is almost as common in rural Alaska as > automobiles are in other areas. That's a bit of an exaggeration but as I > scan the satellite imagery I'm constantly amazed at the sheer number of > these landing strips that are scattered here and there. And if one checks > the USGS Topo maps as I do while adding geographical features to Alaska, > one can see where airstrips existed in the past but when inspecting the > location with satellite imagery, no trace of them can be found. Years ago, > airplane and airport aficionados using sources such as "ourairports.com", > have added hundreds (thousands?) of them to OSM as though they were actual > airports. > > I also add an admission that, not being aware of any other tagging or any > need for differentiation as to type, I've mapped dozens of these as > runways, sometimes adding a surface tag, other times not. > > But they are surely different than one would expect to find at a "real" > airport facility. The more remote variety offer no services, not even fuel, > and are suitable for use by small planes only (bush planes). Many are > abandoned or in need of maintenance. I would not want to give the erroneous > impression that these runways are actually the same sort of beast an > official airport provides. > > I think therefore that there is a definite need to tag such landing strips > differently. > > AlaskaDave > > > > On Mon, Oct 9, 2017 at 7:47 PM, Christoph Hormann <o...@imagico.de> wrote: > >> On Monday 09 October 2017, Martin Koppenhoefer wrote: >> > >> > I am not aware that OSM in any way defines what an “aircraft” is. >> > >> > Why is “aircraft” objective and verifiable, but “airport” is not? >> >> Now discussion is drifting into the ridiculous. >> >> Depending on your perspective it can obviously be considered inherently >> impossible to fully define the meaning of every word of a language >> using just words of this language. The purpose of verbal definitions >> is to create a consistent framework of interrelationships between the >> words that allows you to interpret them in a way that is consistent >> with other users of the language and identify misinterpretations >> because they create inconsistencies. >> >> You used the term 'airport' in a segregative way, i.e. to distinguish >> between runway-like features on an airport and runway-like features on >> a non-airport. The use of the term 'aircraft' is merely descriptive. >> It does not not aim to distinguish runways from non-runways (runway >> tagging according to the definition for example can be equally used for >> runways for manned and unmanned aircrafts). >> >> So even if you have no real idea what an aircraft is you will probably >> be able to mostly map runways correctly based on that definition using >> your understanding of the terms 'air' and 'craft'. >> >> And in general you should as much as possible be able to decide on tags >> based on *local* observations. If the same runway-like feature needs >> to be tagged differently depending on if it is located within an >> airport of not (by whatever definition of airport) that is not a very >> good idea for tagging. A mapper is for example very likely able to >> reliably identify a "strip of land on which aircraft can take off and >> land" from high resolution imagery but specific classification of the >> area this strip is located in can be much less reliable. >> >> -- >> Christoph Hormann >> http://www.imagico.de/ >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> > > > > -- > Dave Swarthout > Homer, Alaska > Chiang Mai, Thailand > Travel Blog at http://dswarthout.blogspot.com > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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