Small Location Change Detection

Question

Hi All,

I'm need to detect small location change for the iphone , I tried the sample that's called Locate Me, but it doesn't recognize the small change in the location. Is there any way for doing this?

Thanks in Advance.

Best regards John

Answer 1

Hi John,

How small is the change that you expected?

Maybe you should set the accuracy to it's maximum and calculate the displacement on the delegate method.

Configure the location manager to give you it's best.

    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    [locationManager setDistanceFilter:0.0];

And then on the delegate method:

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    // Calculate the distance between the two locations
    CGFloat distance = [newLocation distanceFromLocation:oldLocation];

    if (distance >= MIN_DISPLACEMENT) {
        // Do something
    } else {
        // Do something
    }
}

To get more accurate data from the location manager, set the proper keys for UIRequiredDeviceCapabilities (location-services, gps) on the Info.plist.