Michael Bedward ha scritto: > Hi, > > The EPSG registry has this note about Robinson's and similar 'atlas' > projections, which I guess includes Wikel Tripel... > > "Atlas" projection methods not to be included in EPSG db unless > utilised for a CRS that itself is in use by several parties or used in > data exchange. > > It is possible to add custom projections to GeoTools but it's a fair > bit of work and if you only have a small number of maps to do it's > probably not worth the effort. An easier solution might be to just > hand code the lat-lon to Winkel-Tripel transform (the formula looks > simple enough: http://en.wikipedia.org/wiki/Winkel_Tripel) and > "manually" transform your feature coordinates. > > A quick google shows that WT is implemented in the PROJ4 projection > library. One Java wrapper for this is here... > http://www.jhlabs.com/java/maps/proj/ > > If you're ambitious and you do want to try adding the projection there > are some notes here: > http://communitymapbuilder.org/display/GEOTDOC/How+to+add+new+projections
Which I just followed one more time: http://jira.codehaus.org/browse/GEOT-2998 Unfortunately I could not commit, this projection breaks an assumption in the code that held until today: every map projection is invertible. Unfortunately the Winkel Tripel one does not have a simple inversion formula and I see proj and others just handle the fact that not all projections can be inverted. So, some discussion on gt-devel is necessary Cheers Andrea -- Andrea Aime OpenGeo - http://opengeo.org Expert service straight from the developers. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
