Thanks for your help. I'll try that. I'm trying to see if I route passes through a city's limits. I already have all the data, I just needed to know how to compare.
Thanks! On Jul 30, 1:19 pm, Gregory Short <[email protected]> wrote: > I don't think that functionality is built into the API (almost certain > it's not) but one solution would be to take each segment of a route > (necessarily a line-segment), and check if the lat/lon is on that > segment. Of course, it'd probably never be *exactly* on the segment, > but you could do an approximate comparison, i.e. at your current lat, > find the lon of the line segment at the same lat, and see how close > the two lon's are. Better yet would be to find the distance from you > current point to the line along the direction that is perpendicular to > the line. Do a search for "calculate distance from point to line" and > you should find some resources on that. Then you can just specify a > threshold radius and calculate your true/false from that. > > This could get expensive for long/detailed routes, of course, so you'd > need to do some optimization via clipping...an option here would be to > use the start/end points of each line segment as coordinates for a > bounding box, and do some clipping against those before doing the > actual comparison. > > All in all, I don't imagine it would be a terribly difficult thing to > do. That being the case, though, maybe someone else has done it. Have > you looked around for third-party/independent solutions? > > -G > > On Jul 30, 2009, at 12:49 PM, Belthasar wrote: > > > > > > > I was wondering if there was a function that took a set of longitude > > and latitude parameters and told if they were in the current trip? > > > Thanks for your help.- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
