public static int GetDistance(String location1, String location2)
{
// Haversine formula:
// a = sin²(delta_lat/2) + cos(lat1).cos(lat2).sin²(delta_long/2)
// c = 2.atan2(sqrt(a), sqrt(1-a))
// d = R.c
// where R is earth’s radius (mean radius = 6,371km);
// note that angles need to be in radians to pass to trig functions!
double lat1, lon1, lat2, lon2, d_lat, d_lon, a1, a2, a3, a, c, distance;
lat1 = GXGeolocation.GetLatitude(location1);
lon1 = GXGeolocation.GetLongitude(location1);
lat2 = GXGeolocation.GetLatitude(location2);
lon2 = GXGeolocation.GetLongitude(location2);
d_lat = GXGeolocation.DegreesToRadians(lat2 - lat1);
d_lon = GXGeolocation.DegreesToRadians(lon2 - lon1);
lat1 = GXGeolocation.DegreesToRadians(lat1);
lat2 = GXGeolocation.DegreesToRadians(lat2);
a1 = Math.Pow(Math.Sin(d_lat / 2), 2);
a2 = Math.Pow(Math.Sin(d_lon / 2), 2);
a3 = Math.Cos(lat1) * Math.Cos(lat2);
a = a1 + a2 * a3;
c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
distance = 6371 * c * 1000;
return((int)distance);
}
public static List <Geospatial> GetLocationGeography(String address)
{
String urlString = MAPS_URI + "geocode/json?address=" + GXUtil.UrlEncode(address) + "&sensor=false";
String ApiKey = "";
if (Config.GetValueOf("GoogleApiKey", out ApiKey))
{
urlString += "&key=" + ApiKey;
}
String response = GXGeolocation.GetContentFromURL(urlString);
List <Geospatial> result = new List <Geospatial>();
try
{
if (!string.IsNullOrEmpty(response))
{
StringReader sr = new StringReader(response);
JsonTextReader tr = new JsonTextReader(sr);
JObject json = (JObject)(tr.DeserializeNext());
if (json.Contains("results"))
{
JArray results = (JArray)json["results"];
for (int i = 0; i < results.Length; i++)
{
JObject jo = (JObject)results[i];
if (jo.Contains("geometry"))
{
JObject geometry = (JObject)jo["geometry"];
if (geometry.Contains("location"))
{
JObject location = (JObject)geometry["location"];
if (location != null && (location.Contains("lat")) && (location.Contains("lng")))
{
Geospatial point = new Geospatial(Convert.ToDecimal(location["lat"]), Convert.ToDecimal(location["lng"]));
result.Add(point);
}
}
}
}
}
}
}
catch (JsonException ex)
{
GXLogging.Error(log, "getLocation error json:" + response, ex);
}
return(result);
}
public static List <string> GetAddress(String location)
{
String urlString = MAPS_URI + "geocode/json?latlng=" + GXUtil.UrlEncode(location) + "&sensor=false";
String ApiKey = "";
if (Config.GetValueOf("GoogleApiKey", out ApiKey))
{
urlString += "&key=" + ApiKey;
}
String response = GXGeolocation.GetContentFromURL(urlString);
List <string> result = new List <string>();
try
{
if (!string.IsNullOrEmpty(response))
{
StringReader sr = new StringReader(response);
JsonTextReader tr = new JsonTextReader(sr);
JObject json = (JObject)(tr.DeserializeNext());
if (json.Contains("results"))
{
JArray results = (JArray)json["results"];
for (int i = 0; i < results.Length; i++)
{
JObject jo = (JObject)results[i];
if (jo.Contains("formatted_address"))
{
result.Add((string)jo["formatted_address"]);
}
}
}
}
}
catch (JsonException ex)
{
GXLogging.Error(log, "getAddress error json:" + response, ex);
}
return(result);
}
public static double GetLongitude(String geolocation)
{
return(GXGeolocation.GetComponent(geolocation, 1));
}
