I am working with section line data in MapInfo 6.0 currently in a generic Latitude/Longitude format. The table's projection property was set to Category - Latitude/Longitude and the the Category Member-Latitude/Longitude. No datum appears to have been specified and this is where I believe the problem lies.
Another MapInfo table of parcels presently in NAD 1927, Michigan State Plane, Central Zone was registered to the section line table. The section line table was opened first and therefore therefore the mapper projection was set to that base table's projection properties (Lat/Long). When the parcel table is opened, it is reprojected on the fly and is coincident with the section lines and section corners. Because we also need to work in another GIS programs, I then attempted to convert the section lines from Lat/Long to NAD 1927, Michigan State Plane, Central Zone. In a new mapper, when you open the reprojected section lines table with the parcel table, I discovered the section lines had "moved" about 15 feet east from their original position with the parcel base. Can anyone provide insight as to why? My thoughts - Decimal precision - Is MapInfo a single or double precision program? I wonder if rounding at the decimal is causing the problem. In addition, how is MapInfo able to relate a table with no datum with one that does? Thanks for any assistance you can provide, Chris Blough Charlevoix, Michigan _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com _______________________________________________________________________ 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.
