[gdal-dev] Re: EPSG value

[Howard Butler]

On Nov 5, 2010, at 9:05 AM, Jukka Rahkonen wrote:

> ahmet temiz <ahmettemiz88 <at> gmail.com> writes:
> 
>> hello
>> 
>> how can I get  EPSG value of a shp file with OGR ( or gdal) ?
> 
> Ogrinfo will tell something if the shapefile bundle includes .prj file or then
> you can just open the .prj file with text editor and see how it looks like.  It
> does not contain EPSG code directly but you can compare the ESRI Well Known Text
> strings with the ones from http://spatialreference.org/
> 
> If the shapefile did not come with the .prj file the best thing to do is to ask
> from where you received the data. If it is not possible then you will need to
> guess. Open the shapefile with some GIS program and compare it with some other
> dataset with a known projection. Reproject the reference data to other
> projections with ogr2ogr if needed and try again. When vectors match you have
> found it.

You can also try pasting the .prj file into <http://www.prj2epsg.org/search> and seeing if it comes back with an EPSG id for you.

Howard