Hi all, Today, a friend of mine come to me and ask: "Is it possible to hack viking in order to access this Tile Map Service?" As I have a poor geomatic knowledge, I laugh and replied: "Of course guy, viking is tile oriented and a simple declarative section is needed for such stuff".
After a whole day of procrastination, I have to admit it is not so simple. I discovered there is many way to understand "tile cache" system. The most funny is that TMS implemented by OSM (and Google) use an origin at the top of the map, while OSGeo TMS specification considers it at the bottom. But I also discovered an other difference: OSM (and Google) consider latitude between -85,xxx and 85,xxx. IMHO, such difference is really significative for viking. I understand this mean that OSM (and Google) uses a projection system different than the one used in the EPSG:4326 (the tile service I'm currently interested in use this projection). Am I right? I think so because, reading some pages on OpenLayers, I found that OpenLayers have to convert coordinates when using a Google layer and a EPSG:4326 TMS layer. As viking handle correctly OSM tiles, if I want to support such service in viking, I understand I have to add the EPSG:4326 projection in viking? And I fear it will not be really easy. Any information is welcome about this topic. As I said, I do not have geomatic knowledge. References: http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification -- Guilhem BONNEFILLE -=- JID: gu...@im.apinc.org MSN: guilhem_bonnefi...@hotmail.com -=- mailto:guilhem.bonnefi...@gmail.com -=- http://nathguil.free.fr/ ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Viking-devel mailing list Viking-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/viking-devel Viking home page: http://viking.sf.net/
