Folks, I am writing an iPhone app which tracks if a vehicle has passed infront of my house. I can collect the route (a set of <latitude,longitude> locations) from the GPS and I know the location <latitude,longitude> of my house. What is the nest way to find out if the vehicle has passed from infront of my house. Effectively, I need to find out if a point lies on the "geographic" path described by a set of points.
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