android - What does bearingTo(Location dest) exactly calculate? -

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what bearingto(location dest) calculate? can please explain this??

thanks in advance.

 protected void oncreate(bundle savedinstancestate) {     destinationloc.setlatitude(39.543394);     destinationloc.setlongitude(-119.816010);     locationmanager lm =(locationmanager)getsystemservice(location_service);     string provider = lm.getbestprovider(new criteria(), true);     loc=lm.getlastknownlocation(provider)     }      public void onsensorchanged(sensorevent event) {     // todo auto-generated method stub       startloc.setlatitude(loc.getlatitude());       startloc.setlongitude(loc.getlongitude());     if ( startloc == null ) return;      float azimuth = event.values[0];     float baseazimuth = azimuth;     minitialposition.settext("initial latlong: " + startloc.getlatitude() + " " + startloc.getlongitude());     geomagneticfield geofield = new geomagneticfield( double             .valueof( startloc.getlatitude() ).floatvalue(), double             .valueof( startloc.getlongitude() ).floatvalue(),             double.valueof( startloc.getaltitude() ).floatvalue(),             system.currenttimemillis() );     azimuth += geofield.getdeclination(); // converts magnetic north true north      //correct azimuth     azimuth = azimuth % 360;      //this choose point     float direction = azimuth + startloc.bearingto( destinationloc );     float direction2 = startloc.bearingto(destinationloc);

}

the direction2 value shown negative.

read documentation please. describes that method returns.

returns approximate initial bearing in degrees east of true north when traveling along shortest path between location , given location. shortest path defined using wgs84 ellipsoid. locations (nearly) antipodal may produce meaningless results.

parameters

dest destination location

returns

the initial bearing in degrees


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