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

[Blair Christian]

Those are perfect.  I wish I had the time to contribute as much
software as you do, Robert.  Very impressive contributions on the
r-forge pages.

Thanks,
Blair

On Thu, Nov 19, 2009 at 12:46 PM, Robert J. Hijmans <r.hijmans at gmail.com> wrote:
> Blair, sorry, too quick:
>
> Have a look at spTransform in rgdal and at projectRaster in the raster package.
>
> Robert
>
>
> 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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>