javascript - tipos - mapa de latitud y longitud

¿Cómo puedo obtener el nombre de la ciudad desde un punto de latitud y longitud?

Question

¿Hay alguna manera de obtener un nombre de ciudad desde un punto de latitud y longitud con la API de google api para javascript?

Si es así, ¿podría ver un ejemplo?

Answer 1

Aquí hay una solución moderna que usa una promesa:

function getAddress (latitude, longitude) {
return new Promise(function (resolve, reject) {
var request = new XMLHttpRequest();
var method = ''GET'';
var url = ''http://maps.googleapis.com/maps/api/geocode/json?latlng='' + latitude + '','' + longitude + ''&sensor=true'';
var async = true;
request.open(method, url, async);
request.onreadystatechange = function () {
if (request.readyState == 4) {
if (request.status == 200) {
var data = JSON.parse(request.responseText);
var address = data.results[0];
resolve(address);
}
else {
reject(request.status);
}
}
};
request.send();
});
};

Y llámalo así:

getAddress(lat, lon).then(console.log).catch(console.error);

La promesa devuelve el objeto de dirección en ''entonces'' o el código de estado de error en ''captura''

Answer 2

El siguiente código funciona bien para obtener el nombre de la ciudad (usando Google Map Geo API ):

HTML

<p><button onclick="getLocation()">Get My Location</button></p>
<p id="demo"></p>
<script src="http://maps.google.com/maps/api/js?key=YOUR_API_KEY"></script>

GUIÓN

var x=document.getElementById("demo");
function getLocation(){
if (navigator.geolocation){
navigator.geolocation.getCurrentPosition(showPosition,showError);
}
else{
x.innerHTML="Geolocation is not supported by this browser.";
}
}
function showPosition(position){
lat=position.coords.latitude;
lon=position.coords.longitude;
displayLocation(lat,lon);
}
function showError(error){
switch(error.code){
case error.PERMISSION_DENIED:
x.innerHTML="User denied the request for Geolocation."
break;
case error.POSITION_UNAVAILABLE:
x.innerHTML="Location information is unavailable."
break;
case error.TIMEOUT:
x.innerHTML="The request to get user location timed out."
break;
case error.UNKNOWN_ERROR:
x.innerHTML="An unknown error occurred."
break;
}
}
function displayLocation(latitude,longitude){
var geocoder;
geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(latitude, longitude);
geocoder.geocode(
{''latLng'': latlng},
function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
var add= results[0].formatted_address ;
var value=add.split(",");
count=value.length;
country=value[count-1];
state=value[count-2];
city=value[count-3];
x.innerHTML = "city name is: " + city;
}
else {
x.innerHTML = "address not found";
}
}
else {
x.innerHTML = "Geocoder failed due to: " + status;
}
}
);
}

Answer 3

En node.js podemos usar node-geocoder npm module para obtener la dirección de lat, lng.,

geo.js

var NodeGeocoder = require(''node-geocoder'');
var options = {
provider: ''google'',
httpAdapter: ''https'', // Default
apiKey: '' '', // for Mapquest, OpenCage, Google Premier
formatter: ''json'' // ''gpx'', ''string'', ...
};
var geocoder = NodeGeocoder(options);
geocoder.reverse({lat:28.5967439, lon:77.3285038}, function(err, res) {
console.log(res);
});

salida:

nodo geo.js

[ { formattedAddress: ''C-85B, C Block, Sector 8, Noida, Uttar Pradesh 201301, India'',
latitude: 28.5967439,
longitude: 77.3285038,
extra:
{ googlePlaceId: ''ChIJkTdx9vzkDDkRx6LVvtz1Rhk'',
confidence: 1,
premise: ''C-85B'',
subpremise: null,
neighborhood: ''C Block'',
establishment: null },
administrativeLevels:
{ level2long: ''Gautam Buddh Nagar'',
level2short: ''Gautam Buddh Nagar'',
level1long: ''Uttar Pradesh'',
level1short: ''UP'' },
city: ''Noida'',
country: ''India'',
countryCode: ''IN'',
zipcode: ''201301'',
provider: ''google'' } ]

Answer 4

Esto se llama geocodificación inversa

• Documentación de Google:

  http://code.google.com/apis/maps/documentation/geocoding/#ReverseGeocoding .

• Ejemplo de llamada al servicio web de geocodificación de Google:

  http://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&sensor=true

Answer 5

Igual que @Sanchit Gupta.

en esta parte

if (results[0]) {
var add= results[0].formatted_address ;
var value=add.split(",");
count=value.length;
country=value[count-1];
state=value[count-2];
city=value[count-3];
x.innerHTML = "city name is: " + city;
}

solo consola la matriz de resultados

if (results[0]) {
console.log(results[0]);
// choose from console whatever you need.
var city = results[0].address_components[3].short_name;
x.innerHTML = "city name is: " + city;
}

Answer 6

Aquí hay una muestra completa:

<!DOCTYPE html>
<html>
<head>
<title>Geolocation API with Google Maps API</title>
<meta charset="UTF-8" />
</head>
<body>
<script>
function displayLocation(latitude,longitude){
var request = new XMLHttpRequest();
var method = ''GET'';
var url = ''http://maps.googleapis.com/maps/api/geocode/json?latlng=''+latitude+'',''+longitude+''&sensor=true'';
var async = true;
request.open(method, url, async);
request.onreadystatechange = function(){
if(request.readyState == 4 && request.status == 200){
var data = JSON.parse(request.responseText);
var address = data.results[0];
document.write(address.formatted_address);
}
};
request.send();
};
var successCallback = function(position){
var x = position.coords.latitude;
var y = position.coords.longitude;
displayLocation(x,y);
};
var errorCallback = function(error){
var errorMessage = ''Unknown error'';
switch(error.code) {
case 1:
errorMessage = ''Permission denied'';
break;
case 2:
errorMessage = ''Position unavailable'';
break;
case 3:
errorMessage = ''Timeout'';
break;
}
document.write(errorMessage);
};
var options = {
enableHighAccuracy: true,
timeout: 1000,
maximumAge: 0
};
navigator.geolocation.getCurrentPosition(successCallback,errorCallback,options);
</script>
</body>
</html>