[R-sig-Geo] Lambert projection to lat/long question....

Robert J. Hijmans r.hijmans at gmail.com
Thu Nov 19 18:46:13 CET 2009

Blair, sorry, too quick:

Have a look at spTransform in rgdal and at projectRaster in the raster package.


On Thu, Nov 19, 2009 at 9:39 AM, Blair Christian
<blair.christian at gmail.com> wrote:
> Hi All,
> Before trying to reinvent the wheel, I was wondering if the mapproj or
> any other library had code to take lambert coordinates (along with the
> parameters used to generate them) and convert them to lat long.  I
> have grid data in lambert coords, and want to generate the long/lat
> grid corners from them.  I noticed mapproj goes long/lat ->
> projection, but couldn't find anything to go the other way.  I was
> going to use the reference in wolfram mathworld to do the inverse
> transform, if anybody has any issues with their version.
> http://mathworld.wolfram.com/LambertConformalConicProjection.html
> Basically, I want to keep the data stored as grids, but every now and
> then I want to create distance matrices or plot them (which I
> currently do with an irregular grid class I made up), but don't want
> to store polygons all the time when I can just store the basic grid.
> All comments welcome.
> Thanks,
> Blair
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