My problem: I have a load of MI maps that have been digitized using local coordinates (the origin is at the corner of the page or at some other arbitrary point), and I want to transform these maps to long/lats. My current solution: I allocate some control points then export each MI table as a DXF file, use the set coordinates dialogue to set the coordinate transformation, then import the DXFs back into MI. Unfortunately the set coordinates dialogue only uses 2 pairs of coordinates to carry out the transformation, which is really weak. If I want higher accuracy I go through the routine again using 2 different control points. This is a real pain. Does anyone have any better solutions? Also, I am looking for some sympathy / advice....I work for a mineral exploration company in Bulgaria. Bulgaria is a place that is paranoid about national security, and although they have the most amazing topo maps and an excellent grid shown on those maps at all scales, the maps are published without numbers on the grid. Apparently it is illegal for foreigners to know the national grid. This introduces a whole load of problems. When my company first started working here, they used local grids for each project area. Just before I arrived they had started digitising maps in Longs and Lats, as these can be provided when maps are purchased, but again, in the interests of National security, the coordinates are always shifted by about 150m, in a direction kept secret from us. This year, a joint venture partner insisted on carrying out all ground work using their own nationwide metre-based grid, similar to UTMs but not the right UTMs. At the same time we had people working on satellite images and GPS using UTMs................. Has anyone ever experienced such a messy set-up? The end result is that I spend a lot of time trying to work out if things on maps are in the right place, and then I am never quite sure how accurate the data is. Does anyone have any suggestions / advice / consolation......I need to sort something out for the future. Thanks for listening. Fraser. ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
