To convert files from NAD27 to NAD83, whether it is on the fly, or by saving-as, in MapInfo, is done using the NADCON algorithm if you are in the U.S. In Canada, the algorithm used is something called NTV2. As I am in Canada, the NTV2 calculation is the on that I thought I would need, and it just so happens that MapInfo is presently working on a patch for v.6.5 to include NTV2. Unfortunately, I recently found out the in Ottawa, we went with a custom equation that is more accurate than NTV2. This leaves me with a problem everytime I bring in a file in NAD 27, as our NAD83 files have been converted from 27 using this custom equation.
My question is: Does anyone no of a way to customize MapInfo, to be able to input different algorithms in for the conversion of NAD 27 to NAD 83? Our GIS programers who still use VISION GIS were able to soft-code in this algorithm into VISION to do the conversions with our equation. Any thoughts on this problem would be helpful. Pat Leblanc, P.Eng. Water Resources Engineer Infrastructure Services Branch Transportation, Utilities & Public Works City of Ottawa (613) 580-2424 ext. 26708 (613) 560-6071 (fax) [EMAIL PROTECTED] _______________________________________________________________________ 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.
