public LocationInfo ToLocation()
{
var loc = new LocationInfo { Latitude = Latitude, Longitude = Longitude };
if (AddressInfo.ContainsKey(KEY_CITY))
loc.City = AddressInfo[KEY_CITY];
if (AddressInfo.ContainsKey(KEY_STATE))
loc.State = AddressInfo[KEY_STATE];
if (AddressInfo.ContainsKey(KEY_COUNTRY))
loc.Country = AddressInfo[KEY_COUNTRY];
return loc;
}
public bool TryLookup(double latitude, double longitude, out LocationInfo locationInfo)
{
var downloader = new Downloader { EnableCompression = true };
ReverseGeoCodeResult result = downloader.Download<ReverseGeoCodeResult>(BuildUrl(latitude, longitude));
if (result == null)
{
locationInfo = null;
return false;
}
locationInfo = result.ToLocation();
return !string.IsNullOrWhiteSpace(locationInfo.Country) || !string.IsNullOrWhiteSpace(locationInfo.State) || !string.IsNullOrWhiteSpace(locationInfo.City);
}
public LocationInfo ToLocation ()
{
LocationInfo result = new LocationInfo();
var city = GetAddressComponent("locality");
if (city != null)
result.City = city.LongName;
var state = GetAddressComponent("administrative_area_level_1");
if (state != null)
result.State = state.LongName;
var country = GetAddressComponent("country");
if (country != null)
result.Country = country.LongName;
return result;
}
public bool TryLookup(double latitude, double longitude, out LocationInfo locationInfo)
{
var downloader = new Downloader { EnableCompression = true };
downloader.Headers["Accept"] = "application/json";
// Google enables compressed output only, if a valid User-Agent is sent!
downloader.Headers["User-Agent"] = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0";
GoogleResults results = downloader.Download<GoogleResults>(BuildUrl(latitude, longitude));
if (results == null || results.Results == null || results.Results.Count == 0)
{
locationInfo = null;
return false;
}
locationInfo = results.Results[0].ToLocation();
locationInfo.Latitude = latitude;
locationInfo.Longitude = longitude;
return true;
}
public LocationInfo ToLocation()
{
LocationInfo result = new LocationInfo();
var city = GetAddressComponent("locality");
if (city != null)
{
result.City = city.LongName;
}
var state = GetAddressComponent("administrative_area_level_1");
if (state != null)
{
result.State = state.LongName;
}
var country = GetAddressComponent("country");
if (country != null)
{
result.Country = country.LongName;
}
return(result);
}
public bool TryLookup(double latitude, double longitude, out LocationInfo locationInfo)
{
try
{
if (GetFromCache(latitude, longitude, out locationInfo))
return true;
if (NetworkConnectionTracker.IsNetworkConnected)
foreach (IGeolocationLookup lookup in GetOnlineServices())
{
if (lookup.TryLookup(latitude, longitude, out locationInfo))
{
_locationCache.Add(locationInfo);
return true;
}
}
}
catch (Exception ex)
{
ServiceRegistration.Get<ILogger>().Error("Error while executing reverse geocoding.", ex);
}
locationInfo = null;
return false;
}
private bool GetFromCache(double latitude, double longitude, out LocationInfo locationInfo)
{
LocationInfo newLoc = new LocationInfo { Latitude = latitude, Longitude = longitude };
// We cannot compare for exact lat/long values, but we consider points within the CACHE_MAX_DISTANCE_KM
// to belong to same location.
foreach (LocationInfo info in _locationCache.Where(info => CalculateDistance(info, newLoc) <= CACHE_MAX_DISTANCE_KM))
{
locationInfo = info;
return true;
}
locationInfo = null;
return false;
}
public static double CalculateDistance(LocationInfo location1, LocationInfo location2)
{
const double EARTH_RADIUS_KM = 6376.5;
double lat1InRad = DegreesToRadians(location1.Latitude);
double long1InRad = DegreesToRadians(location1.Longitude);
double lat2InRad = DegreesToRadians(location2.Latitude);
double long2InRad = DegreesToRadians(location2.Longitude);
double dLongitude = long2InRad - long1InRad;
double dLatitude = lat2InRad - lat1InRad;
double a = Math.Pow(Math.Sin(dLatitude / 2), 2) + Math.Cos(lat1InRad) * Math.Cos(lat2InRad) * Math.Pow(Math.Sin(dLongitude / 2), 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return EARTH_RADIUS_KM * c;
}
