[Proj] Convert X and Y to Lat and Lon
don_nell at yahoo.com
Thu Dec 17 12:49:23 EST 2009
That's amazing. Thank you so much.
I've been struggling with this for a few days now and finally have the
Would you happen to know how to go the other way too? If I have the Lat and
Lon, how would I know the X and Y. I'm still very new to this.
Thanks again for your time.
> 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
>> 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.
> 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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