I consider them a significantly useful feature.
They are used to indicate an administrative relationship. Because of exclaves/enclaves and the sometimes strange system in the UK a purely geometric approach would not always produce correct results. Use of "is_in" is very error-prone as it relies on string matching. Furthermore, not every data consumer will have the hardware, software, knowledge and patience to recreate the administrative hierarchies based on geometric information. So before the subarea info can be removed, please suggest a workable alternative for the small man. Colin On 2015-01-08 02:37, Toby Murray wrote: > +1 from me. > > I believe the whole U.S. boundary relation actually contains all the state > boundaries as subareas. I've never understood the use. I guess a couple of > times it made downloading the state relations for editing easier but I have > other ways of doing that... > > Toby > On Jan 7, 2015 7:23 PM, "Dave F." <[email protected]> wrote: > >> Hi >> >> This UK county boundary (admin level = 6): >> http://www.openstreetmap.org/relation/57533#map=9/51.1854/-1.8237 [1] >> >> contains nested boundary relations (tagged with role=subarea) with >> numerically higher admin levels: >> http://www.openstreetmap.org/relation/3410643#map=13/51.3398/-2.2428 [2] >> >> Are they relevant? If so, what are they for? The wiki suggests they're >> superseded: >> http://wiki.openstreetmap.org/wiki/Relation:boundary#Relation_members [3] >> >> To me, subarea appears to be used in a similar way to the superseded 'is_in' >> tag, For the same reasons that tag was deprecated, mathematics & the >> admin_level tag can be used to determine if one polygon is inside another. >> They seem to be purely extra baggage >> >> Am I missing something or can these nested relations be removed? >> >> Cheers >> Dave F. >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> http://www.avast.com [4] >> >> _______________________________________________ >> Tagging mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/tagging [5] > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging [5] Links: ------ [1] http://www.openstreetmap.org/relation/57533#map=9/51.1854/-1.8237 [2] http://www.openstreetmap.org/relation/3410643#map=13/51.3398/-2.2428 [3] http://wiki.openstreetmap.org/wiki/Relation:boundary#Relation_members [4] http://www.avast.com [5] https://lists.openstreetmap.org/listinfo/tagging
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