Hi alls Further to some discussions with J. Paris, I wish to mention a few precisions regarding dispp.mbx The point calculated by the application is the point pertaining to a set of polylines the closest to a given point. This, however, applies for an euclidian plan and gives a solution for cartesian coordinates (with the error coming from the fact that such a plan representation distorts the (almost) spheric reality. For spheric coordinate systems (such as long/lat), the calculation is approximative (acceptable for small distances and/or polylines with many close points). I will add a subroutine to search for the point which minimises the dis( ) function (said to correspond to the real "great circle" distance). Cheers Francois -- --------------------------------------------- Francois Molle - DORAS Centre Kasetsart University, Administrative building 10th floor Bangkhen, 10900 Bangkok, Thailand Tel (University): (66 2) 942.81.75 / Fax(University): (66 2) 942.81.70 Tel/Fax (Home) : (66 2) 287.41.53 / Email : [EMAIL PROTECTED] Website : http://www.ku.ac.th/delta --------------------------------------------- ORSTOM changes its name to IRD Institut de Recherche pour le Developpement --------------------------------------------- ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
