[gdal-dev] What's the best way to fix an incorrect projection in a geotiff

[David Strip]

I have a geotiff that contains data in Penn. State-Plane, but the 
coordinate system is listed as GCS WGS84. What's the best way to fix 
this, esp if I have multiple files with this problem?
I can use listgeo to get a file of the all the tags, edit the coordinate 
system to the correct value, then use tiffcp on each file to strip out 
the tags and then use geotifcp to put back the correct ones, but I 
suspect there's a better way, perhaps using gdalwarp with the -to option 
set to override the input SRS, creating a trivial warp? Or maybe 
something simpler that I'm not seeing.
thanks
David