Question

I found this issue with distanceFromLocation function where the return value is not accurate. Please confirm if I did it wrongly or the function is buggy.

CLLocation *locA = [[CLLocation alloc] initWithLatitude:5.321008 longitude:100.290131];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:5.321008 longitude:100.290138];
CLLocationDistance distance = [locA distanceFromLocation:locB];
NSLog(@"distance: %f, locA: %f,%f, locB: %f,%f",distance,locA.coordinate.latitude,locA.coordinate.longitude,locB.coordinate.latitude,locB.coordinate.longitude);

The output is:

distance: 0.775644, locA: 5.321008,100.290131, locB: 5.321008,100.290138

Both locations are near and should be less than 10 meters. However, the function return larger distance. Checked with site such as http://jan.ucc.nau.edu/~cvm/latlongdist.html and the distance should be:

Distance between 5.321008N 100.290131E and 5.321008N 100.290138E is 0.0008 km

Answer 1

Your answer is in meters if you convert it to kilemeters you get 0.000775 km which is roughly the same. see reference documentation from apple for more.