¡@
2014/10/15 ¤U¤È 10:11:10
iphone Programming Glossary: lon2CLLocation Category for Calculating Bearing w/ Haversine function http://stackoverflow.com/questions/3925942/cllocation-category-for-calculating-bearing-w-haversine-function DegreesToRadians self.coordinate.longitude double lat2 DegreesToRadians destinationLocation.coordinate.latitude double lon2 DegreesToRadians destinationLocation.coordinate.longitude double dLon lon2 lon1 double y sin dLon cos lat2 double x cos.. 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..
http://stackoverflow.com/questions/4130821/iphone-compass-gps-direction heading or bearing equation that you can use if you are at lat1 lon1 and the point you are interested in is at lat2 lon2 then the equation is heading atan2 sin lon2 lon1 cos lat2 cos lat1 sin lat2 sin lat1 cos lat2 cos lon2 lon1 This gives you.. use if you are at lat1 lon1 and the point you are interested in is at lat2 lon2 then the equation is heading atan2 sin lon2 lon1 cos lat2 cos lat1 sin lat2 sin lat1 cos lat2 cos lon2 lon1 This gives you a bearing in radians which you can convert.. in is at lat2 lon2 then the equation is heading atan2 sin lon2 lon1 cos lat2 cos lat1 sin lat2 sin lat1 cos lat2 cos lon2 lon1 This gives you a bearing in radians which you can convert to degrees by multiplying by 180 . The value is then between..
http://stackoverflow.com/questions/5988590/how-to-calculate-the-current-speed-and-average-speed-of-user-travelling-from-cur float getDistanceInKm CLLocation newLocation fromLocation CLLocation oldLocation float lat1 lon1 lat2 lon2 lat1 newLocation.coordinate.latitude M_PI 180 lon1 newLocation.coordinate.longitude M_PI 180 lat2 oldLocation.coordinate.latitude.. M_PI 180 lon1 newLocation.coordinate.longitude M_PI 180 lat2 oldLocation.coordinate.latitude 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.. 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 R c NSLog..
Help calculating X and Y from Latitude and Longitude in iPhone http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone is fairly small in area. Pick a coordinate system say bottom left corner with known lat lon at 0 0 pixels. Called lat1 lon2 in following pseudo code Compute vector 1 from the bottom right lat2 lon2 to the bottom left lat1 lon1 Using simple projection.. known lat lon at 0 0 pixels. Called lat1 lon2 in following pseudo code Compute vector 1 from the bottom right lat2 lon2 to the bottom left lat1 lon1 Using simple projection xl lon yl lat then vector 1 lon2 lon1 i lat2 lat1 j Compute vector.. 1 from the bottom right lat2 lon2 to the bottom left lat1 lon1 Using simple projection xl lon yl lat then vector 1 lon2 lon1 i lat2 lat1 j Compute vector 2 from the lat lon position of person you want latp lonp to put on the map to the bottom..
iPhone - Moving a CLLocation by x meters http://stackoverflow.com/questions/7278094/iphone-moving-a-cllocation-by-x-meters the latitude and longitude from your CLLocation to it and then create a new CLLocation from the resulting lat2 and lon2 that it returns Given a starting lat lon point on earth distance in meters and bearing calculates destination coordinates.. Given a starting lat lon point on earth distance in meters and bearing calculates destination coordinates lat2 lon2. all params in degrees void destCoordsInDegrees double lat1 double lon1 double distanceMeters double bearing double.. degrees void destCoordsInDegrees double lat1 double lon1 double distanceMeters double bearing double lat2 double lon2 If you can't use that take a look at the algorithms that it was derived from here and here and perhaps you can modify it..
|
