The easiest way is to find out what the actual projection is, and reconstruct a sensible representation of the grid.
Usually you have to guess, but it's possible to figure out. You *can* plot by building a proper mesh in longlat, but my preference is full rescue. You need to know the projection and its particulars, i.e. google suggests its Lambert Conformal Conic but you also need datum/ellipsoid, standard parallels, and central longitude/latitude at a minimum. If you can point to an actual example and some trail of where it came from someone could help. Also, R-Sig-Geo is a specialized mailing list for this stuff. Cheers, Mike. On Thu, 25 Jun 2015 at 06:08 Florian Losch <m...@florianlosch.de> wrote: > I have spatial data from the WRF-model. I don't know what kind of > projection > was used to produce these data (neither longitude nor latitude are constant > at any borders), but I have 2D matrixes for each longitude and latitude. > The > area covered is North America. How can I add a map using these 2D matrixes? > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Draw-maps-on-arbitrary-Projections-tp4709014.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
