Expanding horizons

[Stephen Davies]

My current Postgis/Mapserver application is proving so successful that I 
have been asked to expand it's scope from just Australia to include 
North America.

However, I am unsure how best to handle such a wide-ranging set of data 
with such disparate projections etc let alone hemispheres.

Do I need to maintain different tables and, therefore, different layers 
for each continent so that I can continue to use SRID 4283 for Oz and 
add 4326 or whatever for US?

How can I work out which metre-based projections to use for distance 
calcs etc?

Some map displays will include geometries from both continents while 
others will be only a couple of kilometers across.

Any and all advice will be greatly appreciated.

Cheers and thanks,
Stephen Davies
-- 
========================================================================
This email is for the person(s) identified above, and is confidential to
the sender and the person(s).  No one else is authorised to use or
disseminate this email or its contents.

Stephen Davies Consulting                            Voice: 08-8177 1595
Adelaide, South Australia.                             Fax: 08-8177 0133
Computing & Network solutions.                       Mobile:0403 0405 83
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: signature
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20051124/24868ba5/attachment.sig>