[Proj] Convert X and Y to Lat and Lon

Hamish hamish_b at yahoo.com
Thu Dec 17 08:24:56 EST 2009

don_nell wrote:
> I'm very new to mapping and I'm trying to use cs2cs.exe
> from Proj4 to
> convert the X and Y values from an ESRI shape file (roads
> from the state of
> Georgia) into Lat and Lon coordinates.  However, I'm
> not sure what
> parameters I need  to accomplish this. 
> I've gotten pretty close using the parameters below (plus
> or minus a city
> block), but I'm sure I could do better.
> +proj=tmerc +units=us-ft +datum=NAD83 +lat_0=-1.77517
> +lon_0=-83.5 +k=0.9999
> +x_0=0.0 
> The "+lat_0" parameter was derived by trial and error. 
> Can anyone tell me the correct parameters to use to make
> this work? 
> The contents of the associated .prj file are as follows. 
> Thanks in advance. 
> Don 




that is just by hand, I think there is some util which comes
with the gdal(?) source code for translating WKT to +proj4

there is one South Georgia LCC in the EPSG file, but it's a
bit different.



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