Andrew The scales shouldn't matter when moving vectors around. Issues like this are pretty common. A couple of things to look at -
1. The coordinate system of both your tables needs to be be BNG - check it is. MI also supports displaying them in different coordinate systems. Check that the coordinate system of the mapper window they are working in is also BNG. Note that rasters can only be displayed in the coordinate system they were registered in (MI doesn't warp rasters) so if you have a lat/long registered raster in your map it will override any statements you issue. 2. In addition, MapInfo has its own coordinate system - the session coordinate system - that defaults to lat/long. You need to use the MapBasic window to explicitly tell MI to use BNG. 3.If the first two have been covered, check that you are using the same bounds for BNG. Using smaller bounds (the default is the whole earths surface I believe) improves the accuracy. 4. The good news is that you can do all of this with a couple of lines in a workspace, if you don't already have a MapBasic program you can extend. Look at "Set Coordsys" and "Set Map Window". You can get the full BNG Coordsys clause from the MapInfo.prj file in the program subdirectory HTH Paul Crisp Syntegra Innovation Place Delta Bank Road Newcastle NE11 9DJ Tel 0191 461 4522 Fax 0191 460 1987 -----Original Message----- From: Andrew Newman [mailto:[EMAIL PROTECTED] Sent: 25 September 2003 10:23 To: [EMAIL PROTECTED] Subject: MI-L Digitising Blues Hello People, Our Cartographers have recently started using MapInfo for cartographic and data capture work, and they are experiencing problems when digitising. They are copying features from vector base maps and pasting them onto an editable layer (another table) they then zoom in on the feature copied and they discover that their copy of the feature appears offset from the original by a few millimeters. They are digitising in both MapInfo 6 & 7 and are working in British National Grid projection. I suspect that the problem is caused when the scale being used to view the data is more zoomed in that the scale at which the data was captured, or that the zoom is beyond the accuracy of the coordinate system. I would appreciate any guidance on what the problem is and how to avoid it. Thanks Andrew --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 8508 ******************************************************************** This email may contain information which is privileged or confidential. If you are not the intended recipient of this email, please notify the sender immediately and delete it without reading, copying, storing, forwarding or disclosing its contents to any other person Thank you Check us out at http://www.syntegra.com ********************************************************************
