How to specify Bounds for a Custom Coord. System Hi All I am standardizing the MapInfo projections for our Peru office to facilitate snapping to objects drafted in other zones. I made custom datum�s & Projections based upon the Peru specific shifts (the rotations are in the process of being calculated/optimized by the government), and they are as follows: "Long / Lat - PSAD 56 Moderate Precision", 1, 999, 4, -279, 175, -379 "UTM PSAD 56 - Zone 17S Mod Precision", 8, 999, 4, -279, 175, -379, 7, -81, 0, 0.9996, 500000, 10000000 I have been reading in the online-help that I can specify the bounds for the coordinate systems by using the following format: name, projectionnum + 3000, projection parameters, unitnum, A, B, C, D, E, F, x1, y1, x2, y2 The online help says to read the Mapbasic Additions and Changes for a discussion on affine transformation. Since I don�t have MapBasic could someone please tell me what the A,B,C,D,E, & F in the above bounds definition format are? Are they X/Y/Z shifts and rotations? If so, what about the �m�-scale correction factors and the Prime Meridian? Any help will be appreciated. Thanks in advance. Phillip J. Allen Consulting Geochemist/Geologist Lima Peru Email: [EMAIL PROTECTED] ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
