Merge pull request #1249 from mapbox/1247-altitude

Altitude Metric

include/mbgl/ios/MGLMapboxEvents.h

@@ -10,6 +10,8 @@ extern NSString *const MGLEventKeyLongitude;
 extern NSString *const MGLEventKeyZoomLevel;
 extern NSString *const MGLEventKeySpeed;
 extern NSString *const MGLEventKeyCourse;
+extern NSString *const MGLEventKeyAltitude;
+extern NSString *const MGLEventKeyVerticalAccuracy;
 extern NSString *const MGLEventKeyPushEnabled;
 extern NSString *const MGLEventKeyEmailEnabled;
 extern NSString *const MGLEventKeyGestureID;

platform/ios/MGLMapboxEvents.m

@@ -23,6 +23,8 @@ NSString *const MGLEventKeyLongitude = @"lng";
 NSString *const MGLEventKeyZoomLevel = @"zoom";
 NSString *const MGLEventKeySpeed = @"speed";
 NSString *const MGLEventKeyCourse = @"course";
+NSString *const MGLEventKeyAltitude = @"altitude";
+NSString *const MGLEventKeyVerticalAccuracy = @"verticalAccuracy";
 NSString *const MGLEventKeyPushEnabled = @"enabled.push";
 NSString *const MGLEventKeyEmailEnabled = @"enabled.email";
 NSString *const MGLEventKeyGestureID = @"gesture";

platform/ios/MGLMetricsLocationManager.m

@@ -45,7 +45,9 @@
             MGLEventKeyLatitude: @(loc.coordinate.latitude),
             MGLEventKeyLongitude: @(loc.coordinate.longitude),
             MGLEventKeySpeed: @(loc.speed),
-            MGLEventKeyCourse: @(loc.course)
+            MGLEventKeyCourse: @(loc.course),
+            MGLEventKeyAltitude: @(loc.altitude),
+            MGLEventKeyVerticalAccuracy: @(loc.verticalAccuracy)
         }];
     }
 }