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
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Stephen Davies Consulting                            Voice: 08-8177 1595
Adelaide, South Australia.                             Fax: 08-8177 0133
Computing & Network solutions.                       Mobile:0403 0405 83
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