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

[Sergey Spiridonov]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

I found workaround for my application so I will not work on this problem
soon.

For somebody who would like to implement it, I will recommend the
following way:

Compare +proj=<def> option and, if they are equal, project several
points (each projection type can have its own subset) and compare
results using predefined (but user-configurable) exactness.

In case there will be need to improve comparision speed, projection
signature can be created. Projection signature should include projection
type and projected coordinates (already rounded to the certain exactness).
- --
Best regards, Sergey Spiridonov
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFF8SrmJ3NEeIx4r3YRAn/ZAJwN7Jgv56O+t5QIXaNapFtcfcrz8gCZAaNR
SrbF2rNr3BDphLNxDMOOvWk=
=eZaX
-----END PGP SIGNATURE-----