Hi Tim, I've seen someone on the list (can't remember who) describing the no-datum (0) as "any-datum", i.e. unfit for use in a multi-datum setup. Much the same mess a mixed Earth and NonEarth will produce. I.e. one should always use a specific datum, and never use datum 0 or NonEarth unless all data are in these pseudo projections.
But I remember that someone at MapInfo told me that the no-datum was actually implemented as WGS84, but I haven't verified this myself. Best regards/Med venlig hilsen Lars V. Nielsen GisPro, Denmark http://www.gispro.dk/ ----- Original Message ----- From: "Timothy Mashford" <[EMAIL PROTECTED]> To: "MapInfo List" <[EMAIL PROTECTED]> Sent: Tuesday, August 17, 2004 11:24 PM Subject: MI-L Datumless Lat/Long > I opened a table in datumless Lat/Long coords, in a > window using an AGD66 projection. It looked fine. Then > I changed the projection to use GDA94 (same as WGS83) > and MapInfo did not shift the objects, so they were > 200m out. > > So were the 'datumless' table coords actually > referring to the AGD66 datum? And if I create from > scratch a table using the datumless Lat/Long, which > centre origin point does it use? Is it the default > table projection from the Options menu? > > Tim. > > > > __________________________________ > Do you Yahoo!? > New and Improved Yahoo! Mail - Send 10MB messages! > http://promotions.yahoo.com/new_mail > > --------------------------------------------------------------------- > List hosting provided by Directions Magazine | www.directionsmag.com | > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Message number: 12979 > > --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 12984
