I'd figured that transforming the latlons in the data, then using the normal processes would be the way to do it, but then I was thinking of the slightly more complicated task of re-projecting with the "poles" in the north pacific and south atlantic (so the landmasses don't get so distorted). But I've no experience of actually doing it.
Richard On Fri, Mar 19, 2010 at 9:21 AM, Frederik Ramm <[email protected]> wrote: > Hi, > > if I want to create a map where South is at the top and North is at the > bottom - how would I best do that? Two approaches I can think of: > > 1. Invent a custom projection that will do it for me. - Is the whole proj4 > projection support versatile enough for that (even if I wanted to rotate not > by 180 degrees but, say, by 131 degrees)? I haven't yet bothered to learn to > (de)code a proj4 initialization string but if it has the power to do custom > rotations then that would a good reason to tackle that. > > 2. Tell Mapnik to render the labels and symbols at 180 degrees angle, and > later rotate the resulting bitmap. - The TextSymbolizer and PointSymbolizer > do not seem to have a rotate option but I figure it should not be overly > hard to add one, or would I likely encounter difficulties? > > Other ideas, experiences? > > Bye > Frederik > > -- > Frederik Ramm www.geofabrik.de > Geofabrik GmbH Handelsregister: HRB Mannheim 703657 > Scheffelstr. 17a Geschaeftsfuehrung: Frederik Ramm, Jochen Topf > 76135 Karlsruhe Tel: 0721-1803560-0 > [email protected] Fax: 0721-1803560-9 > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users > _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
