This is correct for the either case (without the extra "+"): "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" There is some limited supported for the 0, 360 convention in PROJ.4 with the +over argument:
"+proj=longlat +ellps=WGS84 +datum=WGS84 +over +no_defs" but, that will not perform the required shift in longlat alone, it works only to disable the "wrap" that would otherwise occur to force the longitudes back to the -180, 180 convention during a transformation. See this page for the +over argument in PROJ.4: http://trac.osgeo.org/proj/wiki/GenParms Cheers, Mike. On Sat, Oct 2, 2010 at 4:42 AM, Jonathan Greenberg <greenb...@ucdavis.edu>wrote: > Folks: > > I have two sets of spatialpoints data, one that is in lat long which > longitude ranging from -180 to 180, and another that ranges from 0 to 360. > What are the appropriate proj settings for these two different datasets > such that one can be properly reprojected to the other? I have: > > "++proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" for the dataset ranging > -180 to 180 -- is this right? > > --j > > -- > Jonathan A. Greenberg, PhD > Assistant Project Scientist > Center for Spatial Technologies and Remote Sensing (CSTARS) > Department of Land, Air and Water Resources > University of California, Davis > One Shields Avenue > Davis, CA 95616 > Phone: 415-763-5476 > AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307 > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsum...@gmail.com [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
