我已经通过谷歌地图实现了属性搜索，并且每个属性都将在谷歌地图中标记为一个引脚。在我需要的时候，用户可以知道北，南，东，西，东北，西北，西南和东南方向的单一属性（地理编码）的街道名称。我只需要列出每个方向的街道名称。
例如，我正在搜索以下属性，它必须返回
财产：18,Maha street,Coimbatore,Tamilnadu (27.268255,-95.55666)
North : Main street
South : Anna street
East : River road
West : School street
NorthEast : KMSkj Street
NorthWest : Ring road
SouthWest : Hasbdagh Road
SouthEast : Outer ring road
这可以在谷歌地图中实现吗？
如果我获得所有方向的地理编码，那么我们可以正确应用反向地理编码吗？
答案 0 :(得分：0)
我通过服务器端地理编码过程实现了这一点，下面是涉及的方法：
public GeocoderLocation Locate(string query)
{
GeocoderLocation N = new GeocoderLocation();
GeocoderLocation S = new GeocoderLocation();
GeocoderLocation E = new GeocoderLocation();
GeocoderLocation W = new GeocoderLocation();
GeocoderLocation NE = new GeocoderLocation();
GeocoderLocation NW = new GeocoderLocation();
GeocoderLocation SE = new GeocoderLocation();
GeocoderLocation SW = new GeocoderLocation();
WebRequest request = WebRequest
.Create("http://maps.google.com/maps/api/geocode/xml?sensor=false&size=750x700&address="
+ HttpUtility.UrlEncode(query));
using (WebResponse response = request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
XDocument document = XDocument.Load(new StreamReader(stream));
List<XElement> longitudeElement = document.Descendants("lng").ToList();
List<XElement> latitudeElement = document.Descendants("lat").ToList();
if (latitudeElement != null && latitudeElement.Count == 3 && longitudeElement != null && longitudeElement.Count == 3)
{
NE.Longitude = Double.Parse(longitudeElement[1].Value, CultureInfo.InvariantCulture);
NE.Latitude = Double.Parse(latitudeElement[1].Value, CultureInfo.InvariantCulture);
SW.Longitude = Double.Parse(longitudeElement[2].Value, CultureInfo.InvariantCulture);
SW.Latitude = Double.Parse(latitudeElement[2].Value, CultureInfo.InvariantCulture);
NW.Latitude = NE.Latitude;
NW.Longitude = SW.Longitude;
SE.Latitude = SW.Latitude;
SE.Longitude = NE.Longitude;
}
List<GeocoderLocation> NList = new List<GeocoderLocation>();
NList.Add(NE);
NList.Add(NW);
N = GetCentralGeoCoordinate(NList);
List<GeocoderLocation> SList = new List<GeocoderLocation>();
SList.Add(SE);
SList.Add(SW);
S = GetCentralGeoCoordinate(SList);
List<GeocoderLocation> EList = new List<GeocoderLocation>();
EList.Add(SE);
EList.Add(NE);
E = GetCentralGeoCoordinate(EList);
List<GeocoderLocation> WList = new List<GeocoderLocation>();
WList.Add(NW);
WList.Add(SW);
W = GetCentralGeoCoordinate(WList);
string Address_ShortName = string.Empty;
string Address_country = string.Empty;
string Address_administrative_area_level_1 = string.Empty;
string Address_administrative_area_level_2 = string.Empty;
string Address_administrative_area_level_3 = string.Empty;
string Address_colloquial_area = string.Empty;
string Address_locality = string.Empty;
string Address_sublocality = string.Empty;
string Address_neighborhood = string.Empty;
string Address_streetname1 = string.Empty;
string Address_streetname2 = string.Empty;
string Address_streetname3 = string.Empty;
string Address_streetname4 = string.Empty;
string Address_streetname5 = string.Empty;
string Address_streetname6 = string.Empty;
string Address_streetname7 = string.Empty;
string Address_streetname8 = string.Empty;
if (N != null)
{
string str = ReverseGeoLoc(N.Longitude.ToString(), N.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood,out Address_streetname1);
txtNorth.Text = Address_streetname1;
}
if (W != null)
{
string str = ReverseGeoLoc(W.Longitude.ToString(), W.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood, out Address_streetname2);
txtWest.Text = Address_streetname2;
}
if (S != null)
{
string str = ReverseGeoLoc(S.Longitude.ToString(), S.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood,out Address_streetname3);
txtSouth.Text = Address_streetname3;
}
if (NW != null)
{
string str = ReverseGeoLoc(NW.Longitude.ToString(), NW.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood, out Address_streetname4);
txtNorthWest.Text = Address_streetname4;
}
if (NE != null)
{
string str = ReverseGeoLoc(NE.Longitude.ToString(), NE.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood, out Address_streetname5);
txtNorthEast.Text = Address_streetname5;
}
if (SE != null)
{
string str = ReverseGeoLoc(SE.Longitude.ToString(), SE.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood,out Address_streetname6);
txtSouthEast.Text = Address_streetname6;
}
if (SW != null)
{
string str = ReverseGeoLoc(SW.Longitude.ToString(), SW.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood, out Address_streetname7);
txtSouthWest.Text = Address_streetname7;
}
if (E != null)
{
string str = ReverseGeoLoc(E.Longitude.ToString(), E.Latitude.ToString(), out Address_ShortName,
out Address_country, out Address_administrative_area_level_1,
out Address_administrative_area_level_2, out Address_administrative_area_level_3,
out Address_colloquial_area, out Address_locality, out Address_sublocality,
out Address_neighborhood, out Address_streetname8);
txtEast.Text = Address_streetname8;
}
}
}
return null;
}
public GeocoderLocation GetCentralGeoCoordinate(IList<GeocoderLocation> geoCoordinates)
{
if (geoCoordinates.Count == 1)
{
return geoCoordinates.Single();
}
double x = 0;
double y = 0;
double z = 0;
foreach (var geoCoordinate in geoCoordinates)
{
var latitude = geoCoordinate.Latitude * Math.PI / 180;
var longitude = geoCoordinate.Longitude * Math.PI / 180;
x += Math.Cos(latitude) * Math.Cos(longitude);
y += Math.Cos(latitude) * Math.Sin(longitude);
z += Math.Sin(latitude);
}
var total = geoCoordinates.Count;
x = x / total;
y = y / total;
z = z / total;
var centralLongitude = Math.Atan2(y, x);
var centralSquareRoot = Math.Sqrt(x * x + y * y);
var centralLatitude = Math.Atan2(z, centralSquareRoot);
return new GeocoderLocation
{
Latitude = centralLatitude * 180 / Math.PI,
Longitude = centralLongitude * 180 / Math.PI
};
}
public static string ReverseGeoLoc(string longitude, string latitude,
out string Address_ShortName,
out string Address_country,
out string Address_administrative_area_level_1,
out string Address_administrative_area_level_2,
out string Address_administrative_area_level_3,
out string Address_colloquial_area,
out string Address_locality,
out string Address_sublocality,
out string Address_neighborhood,
out string Address_streetname)
{
Address_ShortName = "";
Address_country = "";
Address_administrative_area_level_1 = "";
Address_administrative_area_level_2 = "";
Address_administrative_area_level_3 = "";
Address_colloquial_area = "";
Address_locality = "";
Address_sublocality = "";
Address_neighborhood = "";
Address_streetname = "";
XmlDocument doc = new XmlDocument();
try
{
doc.Load("http://maps.googleapis.com/maps/api/geocode/xml?latlng=" + latitude + "," + longitude + "&sensor=false");
XmlNode element = doc.SelectSingleNode("//GeocodeResponse/status");
if (element.InnerText == "ZERO_RESULTS")
{
return ("No data available for the specified location");
}
else
{
element = doc.SelectSingleNode("//GeocodeResponse/result/formatted_address");
string longname = "";
string shortname = "";
string typename = "";
bool fHit = false;
XmlNodeList xnList = doc.SelectNodes("//GeocodeResponse/result/address_component");
foreach (XmlNode xn in xnList)
{
try
{
longname = xn["long_name"].InnerText;
shortname = xn["short_name"].InnerText;
typename = xn["type"].InnerText;
fHit = true;
switch (typename)
{
//Add whatever you are looking for below
case "country":
{
Address_country = longname;
Address_ShortName = shortname;
break;
}
case "locality":
{
Address_locality = longname;
//Address_locality = shortname; //Om Longname visar sig innehålla konstigheter kan man använda shortname istället
break;
}
case "sublocality":
{
Address_sublocality = longname;
break;
}
case "neighborhood":
{
Address_neighborhood = longname;
break;
}
case "colloquial_area":
{
Address_colloquial_area = longname;
break;
}
case "administrative_area_level_1":
{
Address_administrative_area_level_1 = longname;
break;
}
case "administrative_area_level_2":
{
Address_administrative_area_level_2 = longname;
break;
}
case "administrative_area_level_3":
{
Address_administrative_area_level_3 = longname;
break;
}
case "route":
{
Address_streetname = longname;
break;
}
default:
fHit = false;
break;
}
}
catch (Exception ex)
{
return null;
}
}
return (element.InnerText);
}
}
catch (Exception ex)
{
return null;
}
}
[Serializable]
public class GeocoderLocation
{
public double Longitude { get; set; }
public double Latitude { get; set; }
public override string ToString()
{
return String.Format("{0}, {1}", Latitude, Longitude);
}
}