Unfortunately I sent this directly to Jochen instead of the list - Applogies for that.
On 8/03/2013, at 9:29 PM, Jochen Topf <[email protected]> wrote: > On Wed, Mar 06, 2013 at 07:15:10AM +1300, Glen Barnes wrote: >>> One important difference from the current tagging is that we propose to tag >>> the "calving line" instead of the "grounding line" as natural=coastline. >>> This >>> makes a lot of sense, because for most purposes the "water" side of the new >>> coastline allows typical water use (such as moving about on a ship) while >>> the >>> "land" side of the new coastline allows typical land use (such as building >>> a settlement). This change in tagging will affect all OSM map of Antarctica >>> right away. After the import we have the data available to add specific >>> rendering for shelf-ice allowing a much improved OSM map. >> >> This concerns me a little bit. What happens if someone wants to create a map >> of the world and uses the coastline data to generate the continents? Won't >> Antarctica be incorrect? I'm not sure I see the point in tagging something >> that is not a coastline as a coastline. Why not just tag it as what it is? > > There is no such thing as "the coastline". There are many "lines" that can > be seen as coastlines. Generally in OSM the mean high water line is used. > Our "interpretation" is actually consistent with that in a way. > > Christoph and I have debated this for a long time. See the current state > of the discussion here: > http://wiki.openstreetmap.org/wiki/Antarctica/Tagging > > If you have any arguments against this, please add them to the wiki page > or discuss them on the Imports list. > > Jochen > -- > Jochen Topf [email protected] http://www.remote.org/jochen/ +49-721-388298 I'm trying to get a better handle on how this works in practice vs. other maps of Antarctica. If we look at a satellite view and map view from Google maps the coastline seems to be the grounding line although I may be mistaken: https://www.evernote.com/shard/s2/sh/7b73b236-ed86-4331-8acf-7b6bb416a9a5/9e02240d36230c2de08a174c6369256d Are you saying we make this whole 'bay' disappear by tagging the coasting line as the edge of the ice as opposed to where grounding line? I propose tagging the coastline as the grounding line and the ice shelf as an ice shelf. In that way you are describing what the real world is rather than a perceived value. The grounding line seems to me to represent high tide of the actual unfrozen water. Glen
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