The "problem" I submitted to the list was that when I was trying to position exactly a MIG grid during its creation as a thematic map by adding to the data 2 points representing the bounds I wanted, the resulting MIG would contain one more row and column than necessary.
It "works as designed", simply it is poorly designed for my purpose. My understanding of the way MI generates its MIG is that it takes the Xmin and the Ymax of the point set as the upper left corner of the grid, and it builds the grid from that point with the given cell width until all the points are covered. If (Xmax - Xmin) and (Ymax - Ymin) are multiple of the cell width, the point (Xmax, Ymin) becomes the upper left corner of the last cell and not the lower right corner as I expected, and that explains why there is then an "extra" column to the right and row to the bottom. Vertical Mapper does not allow for exact positioning of the grid; it simply sets the grid position as a multiple of the cell width. Of course, if you define your cell map from the start with the proper coordinates to match that requirement, you will have a good positioning of the WM grid relative to your cell map. Exact positioning without any constraint on data points or coordinates can be found in Grid Analyser; that MI add-on can generate (version 4 at www.terris.sk) MIG files with exact characteristics specified in a requester and perfectly respected (xmin, xmax, ymin, ymax, cell width) Thanks all who have pointed without necessarily knowing it towards the "solution". Jacques Paris e-mail [EMAIL PROTECTED] MapBasic-MapInfo support http://www.paris-pc-gis.com --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 10838
