The important issue here is that there is lots of potential uses here (layers are not used exclusively for creating "maps", they can also be used for analysis) and there are people wishing to use these datasets: the administrative boundaries based on coastline (call them whatever you want), the ones based on the territorial waters, and possible others.
Because of this reason, it would be useful to have them explicitly mapped on OSM. It is not the same to just extract a relation and descendants and build some polygons from there, than to extract the coastline and the borders that are not coastline and try to see how they fit within their containing country. It is feasible, but not practical. However, as you suggested, it is important to keep an eye on maintainability of OSM data when creating these relations. A simple approach would be to create land mass relations having other relations as members. For instance, in Spain such relationship could be easily created from the admin_level=4 relations, containing just 19 members (as subareas). As far as the admin_level=4 relations are correct, the superrelation should be correct (if not, they should be corrected anyway). I don't know if such approach would be so feasible for other countries. Of course, proper tagging should be applied to these relations in order to don't create ambiguities. César 2013/10/3 Martin Koppenhoefer <dieterdre...@gmail.com> > > 2013/10/3 Pieren <pier...@gmail.com> > >> All the states or countries maps I've seen in my life used the >> coastline. It does not mean that the sovereignty stops at the water >> line. It's just a convention. >> > > > how many states or country maps have you seen in scale 1:1000? > > cheers, > Martin > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk > > -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - César Martínez Izquierdo GIS developer - - - - - - - - - - - - - - - - - - - - ETC-SIA: http://sia.eionet.europa.eu/ Universitat Autònoma de Barcelona (SPAIN) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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