Dane Springmeyer writes > > Okay, I've got a bit closer. The right way to do this is > likely a function that computes the route between two points > borrowing from some of the formulas here: > http://williams.best.vwh.net/avform.htm#Crs The postgis > function that calculates the great circle distance is likely > engineered this way, but we'll have to hear from the experts on that.
Close :-) One usually computes the midpoint along the great circle then compares the distance it is from the straight line between the endpoints and recursively does for this for the resulting segments until the error term is 'good enough http://williams.best.vwh.net/avform.htm#Intermediate HTH Norman _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
