/// <summary>
/// Gets the geographic co ordinates and radius for a location by querying a GeoSource endpoint
/// </summary>
/// <param name="geoString">Location name</param>
/// <param name="geoSource">Geosource to query</param>
/// <returns>the geo point</returns>
public static GeocodePoint GetGeoData(string geoString, GeoSource geoSource)
{
GeocodePoint geocodePoint = null;
switch (geoSource)
{
case GeoSource.VirtualEarth:
geocodePoint = GetGeoDataFromVirtualEarth(geoString);
break;
case GeoSource.LoMoLobby:
geocodePoint = GetGeoDataFromLobby(geoString);
break;
}
return(geocodePoint);
}
/// <summary>
/// Queries the LomoLobby for the Location data - Lat,Lon,BoundingBox
/// </summary>
/// <param name="geoString">Search text having the location name</param>
/// <returns>GeocodePoint that encapsulates lat,lon,boundingbox and radius</returns>
private static GeocodePoint GetGeoDataFromLobby(string geoString)
{
string strSearchResults;
GeocodePoint geocodePoint = null;
using (var webClient = new WebClient())
{
string geoApiUrl = string.Format(LoMoLobbyApi, geoString);
strSearchResults = webClient.DownloadString(geoApiUrl);
}
if (!string.IsNullOrEmpty(strSearchResults))
{
var lobbyResults = JsonConvert.DeserializeObject <dynamic>(strSearchResults);
if (lobbyResults != null && lobbyResults.locations.Count > 0 && lobbyResults.locations[0].RelatedWordsFromQuery.Count > 0)
{
double centerLatitude = 0.0;
double centerLongitude = 0.0;
double southLatitude = 0.0;
double northLatitude = 0.0;
double eastLongitude = 0.0;
double westLongitude = 0.0;
if (lobbyResults.locations[0].CenterLatitude != null)
{
centerLatitude = lobbyResults.locations[0].CenterLatitude.Value;
}
if (lobbyResults.locations[0].CenterLongtitude != null)
{
centerLongitude = lobbyResults.locations[0].CenterLongtitude.Value;
}
if (lobbyResults.locations[0].SouthLatitude != null)
{
southLatitude = lobbyResults.locations[0].SouthLatitude.Value;
}
if (lobbyResults.locations[0].NorthLatitude != null)
{
northLatitude = lobbyResults.locations[0].NorthLatitude.Value;
}
if (lobbyResults.locations[0].EastLongitude != null)
{
eastLongitude = lobbyResults.locations[0].EastLongitude.Value;
}
if (lobbyResults.locations[0].WestLongitude != null)
{
westLongitude = lobbyResults.locations[0].WestLongitude.Value;
}
if (centerLatitude != 0.0 && centerLongitude != 0.0 && southLatitude != 0.0 && northLatitude != 0.0 && eastLongitude != 0.0 && westLongitude != 0.0)
{
BoundingBox boundingBox = new BoundingBox
{
SouthLatitude = southLatitude,
NorthLatitude = northLatitude,
EastLongitude = eastLongitude,
WestLongitude = westLongitude
};
double radius = GetRadiusFromBoundingBox(boundingBox);
geocodePoint = new GeocodePoint
{
LocationName = lobbyResults.locations[0].RelatedWordsFromQuery[0].Value,
Latitude = centerLatitude,
Longitude = centerLongitude,
Radius = radius,
BoundingBox = boundingBox
};
}
}
}
return(geocodePoint);
}
/// <summary>
/// Queries the LomoLobby for the Location data - Lat,Lon,BoundingBox
/// </summary>
/// <param name="geoString">Location Name</param>
/// <returns>GeocodePoint that encapsulates lat,lon,boundingbox and radius</returns>
private static GeocodePoint GetGeoDataFromVirtualEarth(string geoString)
{
if (string.IsNullOrEmpty(geoString))
{
return(null);
}
var geoServiceUrl = string.Format(GeoCodeAPI, geoString);
var client = new WebClient();
var str = client.DownloadString(geoServiceUrl);
var xml = XElement.Parse(str);
var geocodePoint = new GeocodePoint {
LocationName = geoString
};
var pointNode = xml.Descendants(VENameSpace + "Point").FirstOrDefault();
var latNode = pointNode != null?pointNode.Descendants(VENameSpace + "Latitude").FirstOrDefault() : null;
var lonNode = pointNode != null?pointNode.Descendants(VENameSpace + "Longitude").FirstOrDefault() : null;
if (latNode != null && lonNode != null)
{
geocodePoint.Latitude = double.Parse(latNode.Value);
geocodePoint.Longitude = double.Parse(lonNode.Value);
}
var boundingBoxNode = xml.Descendants(VENameSpace + "BoundingBox").FirstOrDefault();
var southLatNode = boundingBoxNode != null?boundingBoxNode.Descendants(VENameSpace + "SouthLatitude").FirstOrDefault() : null;
var northLatNode = boundingBoxNode != null?boundingBoxNode.Descendants(VENameSpace + "NorthLatitude").FirstOrDefault() : null;
var westLonNode = boundingBoxNode != null?boundingBoxNode.Descendants(VENameSpace + "WestLongitude").FirstOrDefault() : null;
var eastLonNode = boundingBoxNode != null?boundingBoxNode.Descendants(VENameSpace + "EastLongitude").FirstOrDefault() : null;
if (southLatNode != null && northLatNode != null && westLonNode != null && eastLonNode != null)
{
geocodePoint.Radius = 0.5 * GetGeoDistanceMeters(
double.Parse(southLatNode.Value),
double.Parse(westLonNode.Value),
double.Parse(northLatNode.Value),
double.Parse(eastLonNode.Value));
var boundingBox = new BoundingBox
{
SouthLatitude = double.Parse(southLatNode.Value),
NorthLatitude = double.Parse(northLatNode.Value),
EastLongitude = double.Parse(eastLonNode.Value),
WestLongitude = double.Parse(westLonNode.Value)
};
geocodePoint.BoundingBox = boundingBox;
}
var addressNode = xml.Descendants(VENameSpace + "Address").FirstOrDefault();
if (addressNode != null)
{
var adminDistrict = addressNode.Descendants(VENameSpace + "AdminDistrict").FirstOrDefault();
var countryRegion = addressNode.Descendants(VENameSpace + "CountryRegion").FirstOrDefault();
var locality = addressNode.Descendants(VENameSpace + "Locality").FirstOrDefault();
var postalCode = addressNode.Descendants(VENameSpace + "PostalCode").FirstOrDefault();
geocodePoint.Location = new GeoLocation()
{
AdminDistrict = adminDistrict != null ? adminDistrict.Value : string.Empty,
CountryRegion = countryRegion != null ? countryRegion.Value : string.Empty,
Locality = locality != null ? locality.Value : string.Empty,
PostalCode = postalCode != null ? postalCode.Value : string.Empty
};
}
return(geocodePoint);
}
