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

Sergey Spiridonov sena at hurd.homeunix.org
Thu Mar 1 07:36:05 EST 2007

Hash: SHA1

Hi, Ed

Ed McNierney wrote:
> I made a mild effort at this task a few years ago and gave up.  I had

May be you still have some sources which I can use to start from? Even
if it is not perfect, it will be easier for me and can save some resources.

> The chief difficulty is in determining whether two very similar
> parameter values are supposed to be identical.  Is 0.9997 the same as
> 0.999721, just rounded, or is it supposed to be a different number?

May be there it makes sense to have possibility to specify the level of
exactness of comparision for every group of parameters?

Like user-configurable "epsilon" 0.001 degree for lat/lon, 0.01 meter
for x_0/y_0 with some good default values?

Any other ideas?

PS Sorry if my English cause misundersanding...
- --
Best regards, Sergey Spiridonov
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org


More information about the Proj mailing list