[gdal-dev] prj to proj.4

[Howard Butler]

Looking at the .prj file and searching http://spatialreference.org  
might also be productive.

Another option is to upload it to spatialreference.org, and you can  
then get it in a number of formats.  This approach isn't recommended  
for a lot of SRS's, but for a quick one-off sort of thing, it's pretty  
handy.

Howard

On Mar 25, 2009, at 5:49 AM, Robert Coup wrote:

> Hi Hermann,
>
> On Wed, Mar 25, 2009 at 9:06 PM, Hermann Peifer <peifer at gmx.eu> wrote:
>
> I am looking for a convenient way to convert the SRS parameters from  
> a random shapefile.prj into proj.4 format. A command line interface  
> would be most helpful for a non-programmer, like me.
>
>
> If you have python on your system (likely), then you can create a  
> python script (eg. prj2proj.py) with the following code in it, then  
> run "python prj2proj.py my.prj" and it'll print the proj4 equivalent  
> of the my.prj file.
>
> HTH,
>
> Rob :)
>
>
> #!/usr/bin/env python
>
> import osr
> import sys
>
> def main(prj_file):
>     prj_text = open(prj_file, 'r').read()
>     srs = osr.SpatialReference()
>     if srs.ImportFromWkt(prj_text):
>         raise ValueError("Error importing PRJ information from: %s"  
> % prj_file)
>     print srs.ExportToProj4()
>
> if __name__=="__main__":
>     main(*sys.argv[1])
>
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