Changeset: 50399444
some fixes
Closed by 4b696d
Tags
created_by | JOSM/1.5 (12450 de) |
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Discussion
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Comment from Austin Zhu
hey, overrun is a part of the runway!
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Comment from 4b696d
No it is not. Here is my proof:
1. These runways have a length of 3800 m wich is the length without the blast pads. Lengh with blast pads is 4000m -> https://en.wikipedia.org/wiki/Shanghai_Pudong_International_Airport
2. Quote from wikipedia: The runway thresholds are markings across the runway that denote the beginning and end of the designated space for landing and takeoff under non-emergency conditions.
The runway is the surface from threshold to threshold, which typically features threshold markings, numbers, and centerlines, but not overrun areas at both ends.
-> https://en.wikipedia.org/wiki/Runway#Sections_of_a_runway -
Comment from Austin Zhu
Yes, the runway is 3800m in length, but that's for normal use. You should also include its feature for emergency use, which is the overrun. And most importantly, Wikipedia mentions that blast pad is a section of a runway, so it definitely belongs to a runway. The "runway" which you referred to is only a section of the runway defined by ICAO. I quote here: "a runway is a defined rectangular area on a land aerodrome prepared for the landing and takeoff of aircraft". The definition does not emphasize its usage under specific condition, but both emergency and non-emergency. Besides, if you exclude the blast pad in this way, then how can you depict it?
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Comment from Austin Zhu
Plus, for visual convenience, I think it's more easier to identify the gray area if it is a little bit stretched out. Otherwise it may seems to mix with the gray taxiway although they differ in width when displayed. And visual convenience is crucial for a map, I think.
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Comment from 4b696d
Please keep in mind that we are not supposed to map for the renderer. That means that we shall not map something to make it look better on a certain map.
When there is no tag for a certain feature then you should not use a different one just to make it show up on a map.
I have had a look at hundreds of airports in OSM and I can tell you that blast pads or overrun areas are generally not mapped at all. By mapping the grass around them you could achieve some sort of rendering. You can find this way of mapping at different airports. A different approach might be to tag it as aeroway:overrun, this is not documented but used on 70 ways in OSM. -
Comment from Austin Zhu
I have read several books about airport design and construction. None of them excludes the blast pad from a whole runway. I did not mean that I'm mapping for the rendering, I mean it is convenient for people who use the map. I acknowledge some of your points, but not all.
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Comment from FreedSky
Well, that's empirical. You should follow the definition. What he said makes sense.
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Comment from Austin Zhu
Yeah, I can also say that I have viewed many airports in OSM, but only some of them follow the definition. So I don't think it's persuasive.
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Comment from 4b696d
@FreedSky: I don't know to whom you are referring to as "you" and "he" and I don't think that "the definition" exists.
@Austin Zhu: If you have read a lot of books then you certainly know more about this topic than I do, I only got my info from Wikipedia. I still would not consider these areas as part of the runway but if you do that is fine for me as long as you don't just want them to be rendered in grey. -
Comment from Austin Zhu
That's OK. I will not bother your fix a lot. I only care about airports modified precisely by myself(RJTT, RJAA, RJGG, RJBB, RJOO, etc.), and obviously you can still edit in a way you prefer. Thanks for your suggestions. :-)
Ways (8)
- R1 (508635726), v1
- 16R/34L (62208001), v8
- 372262034, v3
- 414952777, v4
- 416820805, v3
- 416821161, v4
- R1 (469923716), v3
- R6 (469923719), v4
Nodes (17)
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