2014/10/15 下午 10:07:12

iphone Programming Glossary: dlon

CLLocation Category for Calculating Bearing w/ Haversine function

http://stackoverflow.com/questions/3925942/cllocation-category-for-calculating-bearing-w-haversine-function

destinationLocation.coordinate.latitude double lon2 DegreesToRadians destinationLocation.coordinate.longitude double dLon lon2 lon1 double y sin dLon cos lat2 double x cos lat1 sin lat2 sin lat1 cos lat2 cos dLon double radiansBearing atan2 y.. double lon2 DegreesToRadians destinationLocation.coordinate.longitude double dLon lon2 lon1 double y sin dLon cos lat2 double x cos lat1 sin lat2 sin lat1 cos lat2 cos dLon double radiansBearing atan2 y x return RadiansToDegrees radiansBearing.. double dLon lon2 lon1 double y sin dLon cos lat2 double x cos lat1 sin lat2 sin lat1 cos lat2 cos dLon double radiansBearing atan2 y x return RadiansToDegrees radiansBearing iphone mapkit core location cllocation haversine..

how to calculate the current speed and average speed of user travelling from current location to particular loaction in map in iphone [closed]

http://stackoverflow.com/questions/5988590/how-to-calculate-the-current-speed-and-average-speed-of-user-travelling-from-cur

M_PI 180 lon2 oldLocation.coordinate.longitude M_PI 180 float R 6371 km float dLat lat2 lat1 float dLon lon2 lon1 float a sin dLat 2 sin dLat 2 cos lat1 cos lat2 sin dLon 2 sin dLon 2 float c 2 atan2 sqrt a sqrt 1 a float d.. M_PI 180 float R 6371 km float dLat lat2 lat1 float dLon lon2 lon1 float a sin dLat 2 sin dLat 2 cos lat1 cos lat2 sin dLon 2 sin dLon 2 float c 2 atan2 sqrt a sqrt 1 a float d R c NSLog @ Kms f d return d float getDistanceInMiles CLLocation newLocation.. R 6371 km float dLat lat2 lat1 float dLon lon2 lon1 float a sin dLat 2 sin dLat 2 cos lat1 cos lat2 sin dLon 2 sin dLon 2 float c 2 atan2 sqrt a sqrt 1 a float d R c NSLog @ Kms f d return d float getDistanceInMiles CLLocation newLocation fromLocation..

How to get angle between two POI?

http://stackoverflow.com/questions/6140045/how-to-get-angle-between-two-poi

radius 6371 6371km is the radius of the earth float dLat second.coordinate.latitude first.coordinate.latitude float dLon second.coordinate.longitude first.coordinate.longitude float a pow sin dLat 2 2 cos first.coordinate.latitude cos second.coordinate.latitude.. float a pow sin dLat 2 2 cos first.coordinate.latitude cos second.coordinate.latitude pow sin dLon 2 2 float c 2 atan2 sqrt a sqrt 1 a float d radius c return d Another option is to pretend you are on cartesian coordinates..