Hi! I am currently working with Christoph Hormann on improving the data for Antarctica. See http://wiki.openstreetmap.org/wiki/Antarctica for more info.
One problem is that Antarctica doesn't work well in EPSG:4326 plate carree projection. (Mercator is right out because it stops at about 85° South.) Yes, we can edit the data in JOSM, but the nearer you get to the pole the more distortions you get. This is problematic when editing buildings for instance, because they are not rectangular in JOSM. But this is also a problem when deriving data from satellite images. There are WMS services with satellite images that we could use that allow EPSG:3031 polar stereographic projection. But JOSM doesn't support that projection. The problem with using 4326 is that when digitising from an image you will probably not use the right detail. Normally you would space out the nodes along some feature evenly, but with so much distortion you can't see what an even distribution would be. The result is that the features would look ragged in some map projections. How difficult would it be to support EPSG:3031 in JOSM? Jochen -- Jochen Topf [email protected] http://www.remote.org/jochen/ +49-721-388298 _______________________________________________ josm-dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/josm-dev
