On Wed, Mar 13, 2013 at 12:13 PM, Jochen Topf <[email protected]> wrote:
> On Tue, Mar 12, 2013 at 07:00:25PM +0100, Peter Körner wrote: > > That's not that easy for the polar regions, because transforming the > > splittet polygons to the destination projection results in gaps > > because of straigt lines not beeing curved. > > > > For the land there are complete polygons which are used on the > > Antarctica map but there are no complete water polygons, because > > they would be too complex (a huge polygon with 400.000+ holes). > > > > So in order to get this right one would need to modify jochend > > osmcoastline tool to support EPSG:3031 natively, to all corrdinates > > are transformed before splitting and calculating the water polygons. > > Another option would be to split up the long straight lines resulting from > the splitting into shorter pieces. If the pieces are short enough, it > should > be okay. Maybe there is some tool around that can do that easily? I don't > want to put more and more of these things into OSMCoastline, because they > are not really related to coastlines, but general issues with large > objects. > I have done this in the past with the split land and water shapefiles to work with polar projections. ogr2ogr's -segmentize option with a value of 0.1 worked well for me on the WGS84 files. -- AJ Ashton
_______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
