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
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