CODEWITHSUNDEEP
iphoneobjective-ciosmkmapviewcore-location
1110
1110

Reputation: 6839

Calculate distance between two location based on roads

I have two MKCoordinateRegion objects. Based on values from those objects I make two annotations on map. Then I calculate distance between those two locations:

CLLocationCoordinate2D pointACoordinate = [ann coordinate];
    CLLocation *pointALocation = [[CLLocation alloc] initWithLatitude:pointACoordinate.latitude longitude:pointACoordinate.longitude];  

    CLLocationCoordinate2D pointBCoordinate = [ann2 coordinate];
    CLLocation *pointBLocation = [[CLLocation alloc] initWithLatitude:pointBCoordinate.latitude longitude:pointBCoordinate.longitude];  

    float distanceMeters = [pointBLocation distanceFromLocation:pointALocation];

    distanceMeters = distanceMeters / 1000;

But I ma not sure that values I get is correct.
Are those values air distance?
Is it possible to get distance based on roads?
I need distance that user must pass with car.

Upvotes: 0

Views: 4682

Answers (5)

Tiago Almeida
Tiago Almeida

Reputation: 14237

Since iOS7 you can get that info with this:

+ (void)distanceByRoadFromPoint:(CLLocationCoordinate2D)fromPoint
                        toPoint:(CLLocationCoordinate2D)toPoint
              completionHandler:(MKDirectionsHandler)completionHandler {

    MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
    request.transportType = MKDirectionsTransportTypeAutomobile;

    request.source = [self mapItemFromCoordinate:fromPoint];
    request.destination = [self mapItemFromCoordinate:toPoint];

    MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
    [directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse * routeResponse, NSError *routeError) {

         MKRoute *route = [routeResponse.routes firstObject];
         CLLocationDistance distance = route.distance;
         NSTimeInterval expectedTime = route.expectedTravelTime;

         //call a completion handler that suits your situation

     }];    

   }


+ (MKMapItem *)mapItemFromCoordinate:(CLLocationCoordinate2D)coordinate {

    MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordinate addressDictionary:nil];
    MKMapItem *item = [[MKMapItem alloc] initWithPlacemark:placemark];

    return item;

}

Upvotes: 2

mandeep-dhiman
mandeep-dhiman

Reputation: 2535

you have to just pass origin and destination co-ordinate and then parse the result.

http://maps.googleapis.com/maps/api/distancematrix/xml?origins=Vancouver+BC&destinations=San+Francisco&sensor=false

Upvotes: 1

Ankit Srivastava
Ankit Srivastava

Reputation: 12405

what @coolanilkothari says is almost correct almost except for the fact that getDistanceFrom is deprecated in ios 3.2. This is what the apple docs have to say..

getDistanceFrom:

Returns the distance (in meters) from the receiver’s location to the specified location. (Deprecated in iOS 3.2. Use the distanceFromLocation: method instead.) - (CLLocationDistance)getDistanceFrom:(const CLLocation *)location Parameters

location

The other location.

Return Value

The distance (in meters) between the two locations. Discussion

This method measures the distance between the two locations by tracing a line between them that follows the curvature of the Earth. The resulting arc is a smooth curve and does not take into account specific altitude changes between the two locations. Availability

Available in iOS 2.0 and later.
Deprecated in iOS 3.2.

Declared In CLLocation.h

Upvotes: 2

Anil Kothari
Anil Kothari

Reputation: 7733

Use CLLocation instead of CLLocationCoordinate:-

CLLocation has an init method named 

-(id)initWithLatitude:(CLLocationDegrees)latitude longitude:(CLLocationDegrees)longitude.

Then use 

- (CLLocationDistance)getDistanceFrom:(const CLLocation *)location

to get the distance between two CLLocation objects on Road.

The Distance you will get is in kilometers.

Upvotes: 4

Mathieu Hausherr
Mathieu Hausherr

Reputation: 3485

Theses values are air distance.

You can't find the distance based on roads with the Apple SDK. Try to ask directly to google APIs http://code.google.com/intl/fr-FR/apis/maps/index.html

Upvotes: 4

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