Using Scheme:

Define a global function that calculates the distance between two geographic locations specified by latitude and longitude in radians. You are allowed extra global helper functions. (distanceGPS 45.421016 -75.690018 45.4222 -75.6824) 0.6089563918931657 As before, this distance can be found as follows (great circle interpolation): Input: lat1,lon and lat2, lon2 in radian:s Output: distance in kilometers lati - lat,2 radians -2 * asin sqrtsin + cos(lati) * cos(lat2) 2 /lon1 - lon2 distance -6371.0 dradians Note that the GPS location use angles in degree but the above formula expects angles in radians. The angles can be converted as usual: angle degrees angleradians F pL * = p1- 180