Re: [josm-dev] Projections
On Thu, 11 Dec 2008, Frederik Ramm wrote: I have been approached by someone from Estonia. Apparently they have their own parametrized Lambert projection for official data there, and someone has written a JOSM projection class to use that projection in JOSM. I wonder whether we should continue to augment JOSM with special projections like this - it's not a big deal really, just one class and an extra option in the Projection dropdown - or whether it would be better to use the plugin infrastructure for this so that everyone can load their preferred projection as a plugin. Any opinions on the matter? Whereas I have nothing against plugins for that I would encourage to have such central stuff in the central core. Plugins should be only for testing new projections. On the other hand using a projection library would be a good idea :-) We already had this topic. Maybe we could add proj.4 as plugin? I myself have no problems with the wording certain features are only available under UNIX operating systems as long as we provide base features for all OS. Ciao -- http://www.dstoecker.eu/ (PGP key available) ___ josm-dev mailing list josm-dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/josm-dev
Re: [josm-dev] Projections
Being the person who introduced Lambert Zone France in Josm, I can give my opinion about projections in plugin: Pro: - more flexible: we are not depending of the Josm developers to commit the source files although all my requests to commit newer versions of the sources have always been kindly and quickly done. But it's always difficult to depend on others. Con: - the new projection might be required in several plugins, thus we take the risk that the same stuff is developed several times or that the same projection is instanciated in Josm several times for different plugins. Perhaps the solution is to keep the original projections EPSG and Mercator in core and create a projection plugin collecting all projections. In this way, we use the osm subversion repository; we are sure that one projection is developed only once for all; many projections could share a common library of functions. Pieren On Thu, Dec 11, 2008 at 9:27 PM, Frederik Ramm frede...@remote.org wrote: ___ josm-dev mailing list josm-dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/josm-dev
Re: [josm-dev] Projections
Pieren schrieb: Perhaps the solution is to keep the original projections EPSG and Mercator in core and create a projection plugin collecting all projections. In this way, we use the osm subversion repository; we are sure that one projection is developed only once for all; many projections could share a common library of functions. In my opinion, the plugins should work in cartesian coordinates. I've written some scripts, which I will release in the winter holiday. I hope, someone is going to port them to JAVA. Cartesian Coordinates are in a rectagular coordinate system and it's easy to calculate with vectors and trigonometry. Since JOSM is used for short directions 90% of the time, the error rate will be very low ... up to 10 km it's some centimetres. Cartesian Coordinates are the basic of any transformation process, the JOSM could work with any projection: 90° would always be 90° and a circle would always be a circle - internal of course, not on screen :-) ___ josm-dev mailing list josm-dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/josm-dev
