[OSGeo-Discuss] A technical geodesic note about CommonMap - national vs international datums

2011-03-22 Thread Sam Vekemans
Hi, OSGeo-discussion list, I just wanted to forward this message from Brendan, hopefully someone who knows enough about projections can help with this, so to decide on which coordinates system to use, and how to handle coordinates shifting. Thanks, Sam -- Forwarded message --

Re: [OSGeo-Discuss] A technical geodesic note about CommonMap - national vs international datums

2011-03-22 Thread Brent Fraser
Sam, I suppose a good way to minimize datum-related systematic errors in geographic data would be to: - specify your storage datum (e.g. WGS84(G1150) ) (http://www.geod.nrcan.gc.ca/faq_e.php#23) - give approved methods of transforming data from various datums to your storage datum.