Hello Jacques, My concern was based on the extremes of Pro's "unbounded" lat/lon coordinate system. I've just found that it allows a range of -360 to +360 in longitude. Spreading a 32bit integer over this range gives just under 6 units per 1/1,000,000 degree. So, I think you're right that 1/1,000,000 are safe. One more order of magnitude and representation does become an issue, but then again, we are dealing with pretty tiny units then.
I'll get my calculator out before posting next time. :-) Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: Jacques Paris [mailto:[EMAIL PROTECTED]] Sent: Monday, January 14, 2002 9:27 PM To: Warren Vick, Europa Technologies Ltd. Subject: RE: MI-L LAT LONG Precision Warren, This is much interesting. I was told that unbounded lat/lon will always be stored in a matrix with a grain of 1/1 000 000 degree. And I had interpreted that as the worst precision MI could get. What you wrote seems to indicate that there are some conditions where that performance is not met. Is it the case of some specific projections; no, not possible projections would not be in degrees. I would appreciate if you have a lead on that question to add to my knowledge of MI internal precision. Jacques Paris e-mail [EMAIL PROTECTED] MapBasic-MapInfo support http://www.paris-pc-gis.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Warren Vick, Europa Technologies Ltd. Sent: January 14, 2002 14:19 To: Niemiec, Neal; [EMAIL PROTECTED] Subject: RE: MI-L LAT LONG Precision Hello Neal, Jacques gave you a correct calculated answer but, just in case it's relevant, it's important to note that MapInfo Pro may not be able to represent every lat/lon coordinate to that level of accuracy. Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Niemiec, Neal Sent: Friday, January 11, 2002 9:47 PM To: '[EMAIL PROTECTED]' Subject: MI-L LAT LONG Precision Does anybody know what the precision of a six digit lat long coordinate is. NEAL T. NIEMIEC GIS APPLICATION DEVELOPER (303) 706-4497 ECHOSTAR @ INVERNESS OFFICE 90 Inverness Circle East Englewood CO 80112 _______________________________________________________________________ List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MapInfo-L" in the message body. _______________________________________________________________________ List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MapInfo-L" in the message body. _______________________________________________________________________ List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MapInfo-L" in the message body.
