[gdal-dev] Re: prj to proj.4

[Even Rouault]

Hermann,

Actually you don't even need to have root priviledge to use the GDAL bindings.
Go to swig/python and do "make install". This will generate the shared 
libraries and at the end it will error out because it can't install them 
in /usr/local/lib/python2.5/site-packages (or something similar)

Then you need to hand copy into the directory where you put your python script 
the following files/directories : 

swig/python/ogr.py
swig/python/osr.py
swig/python/gdal.py
swig/python/gdalconst.py
swig/python/gdalnumeric.py
swig/python/build/lib.linux-i686-2.5/osgeo/_gdal.so
swig/python/build/lib.linux-i686-2.5/osgeo/_gdalconst.so
swig/python/build/lib.linux-i686-2.5/osgeo/_osr.so
swig/python/build/lib.linux-i686-2.5/osgeo/_ogr.so
swig/python/build/lib.linux-i686-2.5/osgeo/_gdal_array.so
swig/python/osgeo (directory)

(If you're running on Windows, this should be similar. Replace the .so by 
the .dll)

Best regards,
Even

Le Wednesday 25 March 2009 18:31:07 Hermann Peifer, vous avez écrit :
> Howard Butler wrote:
> > 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
>
> Thanks for the hint, but I have 1000's of shapefiles which have all
> kinds of SRS's. So spatialreference.org doesn't seem to be the best
> option in my case. Rob's python script below actually looks like what I
> was looking for. Python is available on my system. I am however not root
> there. I still have to convince the system admin to install the gdal
> site-package, so that I can: import osr
>
> Hermann
>
> > 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])
> >>
> >> _______________________________________________
> >> gdal-dev mailing list
> >> gdal-dev at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
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