[Proj] how to compare 2 proj4 definitions? or: how to normalizeproj4 definition?

Thy, Kristian Kristian.Thy at atkinsglobal.com
Thu Mar 1 07:43:40 EST 2007

From: Frank Warmerdam
> I believe Sergey is looking for a way of comparing PROJ.4 projection
> definitions to see if they are equivelent.  By normalization he means
> putting the coordinate system definition into a "normalized form" such
> that two equivelent coordinate system definitions will have the same
> string representation.  I'm not sure if this is a proper use 
> of the word normalize, but it was at least clear to me.

I think "canonical representation" is the term we're looking for.


This email and any attached files are confidential and copyright protected. If you are not the addressee, any dissemination of this communication is strictly prohibited. Unless otherwise expressly agreed in writing, nothing stated in this communication shall be legally binding.

The ultimate parent company of the Atkins Group is WS Atkins plc.  Registered in England No. 1885586.  Registered Office Woodcote Grove, Ashley Road, Epsom, Surrey KT18 5BW.

Consider the environment. Please don't print this e-mail unless you really need to. 

More information about the Proj mailing list