【Unity】逆ジオコーディングとJSON利用

今回やったのは住所から経度緯度を取得するジオコーディングの逆、経度緯度から住所情報を取得するのが逆ジオコーディング（リバースジオコーディング）です。

使用したのはGoogleのジオコーディングAPIです。

Developer's Guide | Google Maps Geocoding API | Google Developers

Geocoding converts addresses into geographic coordinates to be placed on a map. Reverse Geocoding finds an address based on geographic coordinates or place IDs.

コードはこんな感じで、www.textからJsonを取得できます。

string baseurl = "http://maps.google.com/maps/api/geocode/json?";
string query   = "";
void Start() {
  float lat = 26.68739f;
  float lng = 3.11659f;
  query = "latlng="+lat+","+lng+"&sensor=false&language=ja";
  StartCoroutine (GetData());
}
IEnumerator GetData() {
  string url = baseurl + query;
  WWW www = new WWW(url);
  yield return www;
  Debug.Log(www.text);
}

string baseurl = "http://maps.google.com/maps/api/geocode/json?";

string query = "";

void Start() {

float lat = 26.68739f;

float lng = 3.11659f;

query = "latlng="+lat+","+lng+"&sensor=false&language=ja";

StartCoroutine (GetData());

}

IEnumerator GetData() {

string url = baseurl + query;

WWW www = new WWW(url);

yield return www;

Debug.Log(www.text);

}

返ってくるJSONデータ

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "タマンラセット",
               "short_name" : "タマンラセット",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "アルジェリア",
               "short_name" : "DZ",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "アルジェリア タマンラセット",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 29.123529,
                  "lng" : 11.0868601
               },
               "southwest" : {
                  "lat" : 18.9600279,
                  "lng" : 0.822672
               }
            },
            "location" : {
               "lat" : 24.0982893,
               "lng" : 3.743509
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 29.123529,
                  "lng" : 11.0868601
               },
               "southwest" : {
                  "lat" : 18.9600279,
                  "lng" : 0.822672
               }
            }
         },
         "place_id" : "ChIJaSLqlGMAEhIRiuJQhArj92g",
         "types" : [ "administrative_area_level_1", "political" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "アルジェリア",
               "short_name" : "DZ",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "アルジェリア",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 37.2216,
                  "lng" : 11.999999
               },
               "southwest" : {
                  "lat" : 18.968147,
                  "lng" : -8.667611299999999
               }
            },
            "location" : {
               "lat" : 28.033886,
               "lng" : 1.659626
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 37.2216,
                  "lng" : 11.999999
               },
               "southwest" : {
                  "lat" : 18.968147,
                  "lng" : -8.667611299999999
               }
            }
         },
         "place_id" : "ChIJ0XsDKGqKfg0RovjXq-O-QHE",
         "types" : [ "country", "political" ]
      }
   ],
   "status" : "OK"
}

{

"results" : [

{

"address_components" : [

{

"long_name" : "タマンラセット",

"short_name" : "タマンラセット",

"types" : [ "administrative_area_level_1", "political" ]

{

"long_name" : "アルジェリア",

"short_name" : "DZ",

"types" : [ "country", "political" ]

}

"formatted_address" : "アルジェリアタマンラセット",

"geometry" : {

"bounds" : {

"northeast" : {

"lat" : 29.123529,

"lng" : 11.0868601

"southwest" : {

"lat" : 18.9600279,

"lng" : 0.822672

}

"location" : {

"lat" : 24.0982893,

"lng" : 3.743509

"location_type" : "APPROXIMATE",

"viewport" : {

"northeast" : {

"lat" : 29.123529,

"lng" : 11.0868601

"southwest" : {

"lat" : 18.9600279,

"lng" : 0.822672

}

"place_id" : "ChIJaSLqlGMAEhIRiuJQhArj92g",

"types" : [ "administrative_area_level_1", "political" ]

{

"address_components" : [

{

"long_name" : "アルジェリア",

"short_name" : "DZ",

"types" : [ "country", "political" ]

}

"formatted_address" : "アルジェリア",

"geometry" : {

"bounds" : {

"northeast" : {

"lat" : 37.2216,

"lng" : 11.999999

"southwest" : {

"lat" : 18.968147,

"lng" : -8.667611299999999

}

"location" : {

"lat" : 28.033886,

"lng" : 1.659626

"location_type" : "APPROXIMATE",

"viewport" : {

"northeast" : {

"lat" : 37.2216,

"lng" : 11.999999

"southwest" : {

"lat" : 18.968147,

"lng" : -8.667611299999999

}

"place_id" : "ChIJ0XsDKGqKfg0RovjXq-O-QHE",

"types" : [ "country", "political" ]

}

"status" : "OK"

}

JSON形式で取得できるのはいいけど、javascriptと違って扱いが面倒でした。

入れ物用のクラスを用意してJsonUtility.FromJsonで格納する必要があります。

GoogleGeoJson json = JsonUtility.FromJson<GoogleGeoJson>(www.text);
Debug.Log(JsonUtility.ToJson(json));
Debug.Log(json.results[0].address_components[0].long_name);
Debug.Log(json.results[0].formatted_address);
Debug.Log(json.results[0].geometry.bounds.northeast.lng);
Debug.Log(json.results[0].geometry.location.lat);
Debug.Log(json.results[0].geometry.viewport.southwest.lng);
Debug.Log(json.results[0].types[0]);

GoogleGeoJson json = JsonUtility.FromJson<GoogleGeoJson>(www.text);

Debug.Log(JsonUtility.ToJson(json));

Debug.Log(json.results[0].address_components[0].long_name);

Debug.Log(json.results[0].formatted_address);

Debug.Log(json.results[0].geometry.bounds.northeast.lng);

Debug.Log(json.results[0].geometry.location.lat);

Debug.Log(json.results[0].geometry.viewport.southwest.lng);

Debug.Log(json.results[0].types[0]);

[System.Serializable]
public class GoogleGeoJson {
	public G_result[] results;
	public string status;
}
[System.Serializable]
public class G_result {
	public G_address_component[] address_components;
	public string formatted_address;
	public G_geometry geometry;
	public string place_id;
	public string[] types;
}
[System.Serializable]
public class G_address_component {
	public string long_name;
	public string short_name;
	public string[] types;
}
[System.Serializable]
public class G_geometry {
	public G_Rect bounds;
	public G_latlng location;
	public string location_type;
	public G_Rect viewport;
}
[System.Serializable]
public class G_Rect {
	public G_latlng northeast;
	public G_latlng southwest;
}
[System.Serializable]
public class G_latlng {
	public float lat;
	public float lng;
}

[System.Serializable]

public class GoogleGeoJson {

public G_result[] results;

public string status;

}

[System.Serializable]

public class G_result {

public G_address_component[] address_components;

public string formatted_address;

public G_geometry geometry;

public string place_id;

public string[] types;

}

[System.Serializable]

public class G_address_component {

public string long_name;

public string short_name;

public string[] types;

}

[System.Serializable]

public class G_geometry {

public G_Rect bounds;

public G_latlng location;

public string location_type;

public G_Rect viewport;

}

[System.Serializable]

public class G_Rect {

public G_latlng northeast;

public G_latlng southwest;

}

[System.Serializable]

public class G_latlng {

public float lat;

public float lng;

}

JSON使うたびにクラス作るなんて面倒だけど仕方ない。

ネストされてないとかなり簡潔に書けるけど、大抵はネストされてると思う。

XML形式にしても、より面倒そうなのでAPI使いにくいなぁ。

せめて Dictionary クラスが使用可能ならよかったんですが。

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