Not all data sent using $http.post angularjs

why is it that whenever I send data to my server from my mobile application (Ionic Framework) not all data is sent?

$http({
                method: 'POST',
                url: 'http://remoteserver/data',
                headers: {'Content-Type': 'application/x-www-form-urlencoded'},
                transformRequest: function(obj) {
                    var str = [];
                    for(var p in obj)
                    str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
                    return str.join("&");
                },
                data: { image: $scope.imgURI,
                        facebook_id: localStorage.facebook_id,
                        token: localStorage.accessToken,
                        location: localStorage.location,
                        lon: localStorage.longitude,
                        lat: localStorage.latitude
                      }
            }).success(function (suc)
            {
                localStorage.removeItem('longitude');
                localStorage.removeItem('latitude');
                localStorage.removeItem('location');
                alert(JSON.stringify(suc));
            })
            .error(function(err){alert(JSON.stringify(err));});

The location after is undefined when the server receives it. When in fact, I alert it to check if its not empty. How can I fix this? Of all the data sent to my server, only the location is missing. The location is the reversed geocoding of the latitude and longitude. I just put it in my mobile to reduce the over use of Google API since it is per session basis.