[R-sig-Geo] function to convert to/from U.S. State Plane Coordinates?

[Waichler, Scott R]

Hi,  Does an R function exist to convert to and from the State Plane Coordinates system used in the U.S.?  My search with Rseek was fruitless.

Scott Waichler
Hydrology Group, Energy & Environment Directorate
Pacific Northwest National Laboratory
Richland, WA, USA
scott.waichler at pnnl.gov