i am working on a application where i am saving the coordinates of a location in database
now i need to use these coordinates and display the location on a map. Can some one please
suggest me how can i change the latitude & longitude stored as NSString to coordinate. I want
to use these coordinates to display an anotation on the map.
Thanks in advance
CLLocationCoordinate2D anyLocation = [[CLLocationCoordinate2D alloc] init];
anyLocation.latitude = [latText doubleValue];
anyLocation.longitude = [lonText doubleValue];
latText and lonText are strings
Related
Hi, i am working on GPS ios app.
I want to display user's location on Circle as shown in image.
The user is in center.
I want to display his friend's location on proper direction.
I had already got langitude and latitude of both user .
But how can i get other user's direction?
If can i use Bearing angle?
I get the Distance between two uses by this code
CLLocation *locA = [[CLLocation alloc] initWithLatitude:Latitude longitude:Longitude];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:app.lat longitude:app.lag];
CLLocationDistance distance = [locB distanceFromLocation:locA];
Thanks for Help!!
You can do it using two ways :
1.
CLLocationCoordinate2D start = { c_lat, c_long };
CLLocationCoordinate2D destination = { [[dic valueForKey:#"business_lat"]doubleValue], [[dic valueForKey:#"business_long"]doubleValue] };
NSString *googleMapsURLString = [NSString stringWithFormat:#"http://maps.google.com/?saddr=%1.6f,%1.6f&daddr=%1.6f,%1.6f&",start.latitude, start.longitude, destination.latitude, destination.longitude];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:googleMapsURLString]];
2.
Using Google API
In API you just need to pass origin name and destination name
Hope this helped....
This question describing how to compute bearing using the haversine function
In my application i have array of latitude and longitude with 5-6 places i want to short distance from my current location and show it on my map view for example: i have 3 places location A,B and C so i want to short them according to my current location if location C is near to my current location then first i want to show C location on MAP after that calculate location A and B with location C means which location is near to place C if B is near to place C then show B location on map and at the last show location A
How can we do that ?
To see the distance between two locations
CLLocation *locA = [[CLLocation alloc] initWithLatitude:latA longitude:longA];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:latB longitude:longB];
CLLocation *locC = [[CLLocation alloc] initWithLatitude:latC longitude:longC];
CLLocation *yourLoc = [[CLLocation alloc] initWithLatitude:yourLat longitude:yourLong];
then get the distances between the place and your location
CLLocationDistance distance = [locA distanceFromLocation:yourLoc];
CLLocationDistance distance2 = [locB distanceFromLocation:yourLoc];
CLLocationDistance distance3 = [locC distanceFromLocation:yourLoc];
and finally compare the distances.
Is it possible to get coordinates by giving name of a place in iPhone? I don't want to use any Web Service as they have few limitations. Can i do it using iPhone SDK?
Thanks in advance.
As #raj2raaz have mentioned, we can'nt get coordinates by just specify the name of the place, you must have to use web servics in iPhone to get coordinates.
http://iphonesdksnippets.com/post/2010/02/15/Get-Coordinates-from-Address.aspx
The short answer is no, you can't give an address and get the longitude / latitude position. Several people have written libraries that use the different web services, see this answer for details: Forward geocoding from the iPhone .
I know that you said you don't want to use various web services, but, well, you can't get everything for free. Somebody's CPU cycles are going to have to do a search. Most of them seem to me to have terms that are acceptable for most applications.
Yes, it's possible, but you have to do some work. I am currently putting this effort in one of my project. The GeoNames geographical database covers all countries and contains over eight million placenames that are available for download free of charge. I am adding their cites with population over 1,000 3.9M zip file to my project. It's contain long/lat of each city. I am going to parse each city into a custom NSObject and load them into Core Data.
In my project, instead of doing a city name search, I am going to find the closet city to a particular lat/long coordinate. Haversine formula is used to calculate the distance between two points on a sphere. Here are the formula written in Objective-C and Perl.
My current progress of parsing that data can be found here. I still have work to complete.
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:YOUR_LOCATION completionHandler:^(NSArray* placemarks, NSError* error)
{
NSLog(#"completed");
if ( error )
{
NSLog(#"error = %#", error );
}
else
{
//Here you get information about the place in placemarks array
}
}];
you can get the coordinates by calling this method .this method requires the address(name of place).
-(CLLocationCoordinate2D) addressLocation:(NSString *)addrss {
NSString *urlString = [NSString stringWithFormat:#"http://maps.google.com/maps/geo?q=%#&output=csv",
[addrss stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:#","];
double latitude = 0.0;
double longitude = 0.0;
if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:#"200"]) {
latitude = [[listItems objectAtIndex:2] doubleValue];
longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
//Show error
}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;
return location;
}
I am new at iphone and I have a problem.
I have this code
for (int i=0; i<2; i++) {
Datos *datos = (Datos *)[arr_datos objectAtIndex:i];
CLLocationCoordinate2D coord;
AnnotationItem *annotationItem = [[AnnotationItem alloc] init];
coord.latitude =[datos.latitud doubleValue];
coord.longitude = [datos.longitud doubleValue];
NSLog(#"coord %f",coord.longitude);
NSLog(#"coord %f",coord.latitude);
[annotationItem setCoordinate:coord];
//[annotationItem setEstacion:estacion];
[mapView_ addAnnotation:annotationItem];
[annotationItem release];
}
The problem that it doesn't done anything
But if i change the coord.latitude=40.444 and coord.longitude=-3.700;
this gives me what I want, but I don't want this, because I have an array with many latitudes and longitudes. Can anyone help me with this? when i put coord.longitude=[datos.longitude floatValue];, it doesn't work?
I'm using Xcode 3.2.2
Thanks and forgive me english.
The problem is that i had change the values, I was putting wrong values. Only I have to do is change the
coord.latitude =[datos.longitud doubleValue];
coord.longitude = [datos.latitud doubleValue];
thank everyone for your time.
It seems like Datos is an object you defined since i couldn't find it in the SDK. Given that it could be a few different things:
Either that arr_datos does not have the correct (or any) data inside of it
It could be that the Datos object is incorrectly handling data passed into it and not storing it correctly.
Place a breakpoint in Xcode and verify that arr_datos has the information you think inside of it and that the datos object is correctly storing information.
CLLocationCoordinate2D is not an object so declare it like:
CLLocationCoordinate2D coord;
BTW, you should be getting warnings about CLLocationCoordinate2D *coord - can you check your compiler logs?
[suggestion1]
NSLog(#"datos.lon %#", datos.longitud);
NSLog(#"datos.lat %#", datos.latitud);
[/suggestion1]
[suggestion2]
Note too that you can iterate through all of your datos_arr with the following:
for(Datos *datos in datos_arry) {
NSLog(.....);
}
[/suggestion2]
Is it possible to use the mapkit in the iphone sdk to calculate driving distance between two addresses ?
How about using the Core Location framework:
- (CLLocationDistance)getDistanceFrom:(const CLLocation *)location
You'll need the latitude/longitudes for both addresses.
Edit: Deprecated in iOS 3.2. Use the distanceFromLocation: method instead.
With iOS7 you get full directions within the API
Take a look at this tutorial Tutorial.
No but if you have the longitude/latitude then it is fairly easy to calculate the distance. It is the mathematical distance between those points of course. Not the actual driving or walking distance that is based on an actual route.
In my applications I used MKDirections to get driving (walking) distance between two location.
CLLocationCoordinate2D startCoordinates = YOUR_START_COORDINATES;
CLLocationCoordinate2D endCoordinates = YOUR_END_COORDINATES;
MKPlacemark *startPoint = [[MKPlacemark alloc] initWithCoordinate:startCoordinates];
MKPlacemark *endPoint = [[MKPlacemark alloc] initWithCoordinate:endCoordinates];
MKMapItem *startItem = [[MKMapItem alloc] initWithPlacemark:startPoint];
MKMapItem *endItem = [[MKMapItem alloc] initWithPlacemark:endPoint];
MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
request.source = startItem;
request.destination = endItem;
request.transportType = MKDirectionsTransportTypeAutomobile; //here you can choose a transport type you need
MKDirections *direction = [[MKDirections alloc] initWithRequest:request];
[direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse * _Nullable response, NSError * _Nullable error) {
if (response) {
for (MKRoute *route in response.routes) {
NSLog(#"Distance : %f", route.distance);
}
}
}];
if you have you location as an address, so you can use the method of CLGeocoder, which will give you latitude and longitude of your address
- (void)geocodeAddressString:(NSString *)addressString completionHandler:(CLGeocodeCompletionHandler)completionHandler;
If you compare a driving distance result using MKDirections with the one using Google Maps, you will see that they differ. I was searching regarding this matter and came across the following link http://www.macworld.co.uk/review/reference-education/apple-maps-vs-google-maps-3464377/
Even though Apple have been improving their map service, they still concede in accuracy to Google (IMO), at least in a question regarding the driving distance.
So if accuracy is not highly important in your case, so you can follow along with Apple. Otherwise I would recommend checking Google API.