Re: [Tagging] Feature Proposal - RFC - Coastline-River transit placement
On Sunday 30 March 2014, Eugene Alvin Villar wrote: The Rio de la Plata example on the wiki page is pretty weird. Well -the Rio de la Plata example is definitely the largest, but not the weirdest since the coastline there is placed at the outer limit of the estuary. In case of the Northern Dvina OTOH the limit is fully arbitrary. At lower zoom levels, Buenos Aires and Montevideo become landlocked. Now this may just be a rendering issue, but if these two capitals are considered coastal cities, then they should be next to the coastline instead of the coastline matching the UNCLOS baseline. Under the proposed rules an argument could be made for placing the coastline near Montevideo. Buenos Aires could well be considered to be located at the river rather than the coast although the transit could also be placed further upstream of course. -- Christoph Hormann http://www.imagico.de/ ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
[Tagging] Feature Proposal - RFC - Coastline-River transit placement
Hello, i put up a proposal for specifying somewhat tighter limits on where to place the transit between the coastline and the riverbank polygon at the mouth of a river: https://wiki.openstreetmap.org/wiki/Proposed_Features/Coastline-River_transit_placement Currently there are essentially no rules at all on this matter and it appears to me this is not really helpful for mappers. Cases of extreme placement are rare but when they occur they often have a high impact since they involve large scale features usually prominently shown in maps. The limits i drafted are fairly loose and should cover most opinions on where the transit should best be placed in individual cases. I do this as a proposal since it at least formally affects the meaning of an existing tag although practically there would only be very few places where changes would need to be made to comply with it. -- Christoph Hormann http://www.imagico.de/ ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Feature Proposal - RFC - Coastline-River transit placement
On Sat, Mar 29, 2014 at 03:44:17PM +0100, Christoph Hormann wrote: Hello, i put up a proposal for specifying somewhat tighter limits on where to place the transit between the coastline and the riverbank polygon at the mouth of a river: https://wiki.openstreetmap.org/wiki/Proposed_Features/Coastline-River_transit_placement Currently there are essentially no rules at all on this matter and it appears to me this is not really helpful for mappers. Cases of extreme placement are rare but when they occur they often have a high impact since they involve large scale features usually prominently shown in maps. The limits i drafted are fairly loose and should cover most opinions on where the transit should best be placed in individual cases. looks a bit complex and still doesn't mention some issues which might be important as well: * coastline is foremost a geographical shape, so whatever the reasoning the results should be so that the coastline looks intuitive * this shape is used in special ways by some tools and renderers so we should keep an eye on that * coastline should be somewhere in the brackish water separating freshwater and saltwater * if part of the rationale is to determine whether some city is on the coast than that would typically be better defined by harbor or other properties. Any such application will require a more fine-grained approach anyway. Is there a harbor? Can I swim or surf there? Richard ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Feature Proposal - RFC - Coastline-River transit placement
On 29/03/2014 20:29, Richard Z. wrote: Currently there are essentially no rules at all on this matter Nor will there ever be. OSM mappers are free spirits! ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Feature Proposal - RFC - Coastline-River transit placement
On Saturday 29 March 2014, Richard Z. wrote: [...] * if part of the rationale is to determine whether some city is on the coast than that would typically be better defined by harbor or other properties. Any such application will require a more fine-grained approach anyway. Is there a harbor? Can I swim or surf there? This was meant as an example - i did not specifically have this application in mind. Using the coastline to determine the distance of some object to the coast would be equally suited. The point i am trying to make is that for applications other than map rendering consistent placement of the coastline-river transit is important as well. Using water salinity as a criterion will not work since there often is no continuous transit from freshwater to saltwater but a layering with freshwater on top and the heavier saltwater below. Apart from that fast flowing rivers can reduce the salinity quite far out into the ocean. -- Christoph Hormann http://www.imagico.de/ ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
