Given the lat long coordinates how can we find out the city country

Question

For example if we have these set of coordinates   latitude   48 858844300000001   longitude   2 2943506    How can we find out the city country

User · Answer

It really depends on what technology restrictions you have.

One way is to have a spatial database with the outline of the countries and cities you are interested in. By outline I mean that countries and cities are store as the spatial type polygon. Your set of coordinates can be converted to the spatial type point and queried against the polygons to get the country/city name where the point is located.

Here are some of the databases which support spatial type: SQL server 2008, MySQL, postGIS - an extension of postgreSQL and Oracle.

If you would like to use a service in stead of having your own database for this you can use Yahoo's GeoPlanet. For the service approach you might want to check out this answer on gis.stackexchange.com, which covers the availability of services for solving your problem.

User · Answer

You need geopy  pip install geopy   and then   from geopy geocoders import Nominatim geolocator   Nominatim   location   geolocator reverse  48 8588443  2 2943506    print location address    to get more information   print  location raw     place id    24066644    osm id    2387784956    lat    41 442115    lon    -8 2939909    boundingbox     41 442015    41 442215    -8 2940909    -8 2938909     address     country    Portugal    suburb    Oliveira do Castelo    house number    99    city district    Oliveira do Castelo    country code    pt    city    Oliveira  S  o Paio e S  o Sebasti  o    state    Norte    state district    Ave    pedestrian    Rua Doutor Avelino Germano    postcode    4800-443    county    Guimar  es     osm type    node    display name    99  Rua Doutor Avelino Germano  Oliveira do Castelo  Oliveira  S  o Paio e S  o Sebasti  o  Guimar  es  Braga  Ave  Norte  4800-443  Portugal    licence    Data    OpenStreetMap contributors  ODbL 1 0  http   www openstreetmap org copyright

User · Answer

Another option    Download the cities database from http   download geonames org export dump  Add each city as a lat long -  City mapping to a spatial index such as an R-Tree  some DBs also have the functionality  Use nearest-neighbour search to find the closest city for any given point   Advantages     Does not depend on an external server to be available Very fast  easily does thousands of lookups per second    Disadvantages    Not automatically up to date Requires extra code if you want to distinguish the case where the nearest city is dozens of miles away May give weird results near the poles and the international date line  though there aren t any cities in those places anyway

User · Answer

Minimize the amount of libraries  Get a key to use the api at their website and just get the result in a http request  curl -i -H  quot key  YOUR KEY quot  -X GET https   api latlong dev lookup lat 38 7447913 amp long -9 1625173

User · Answer

The free Google Geocoding API provides this service via a HTTP REST API  Note  the API is usage and rate limited  but you can pay for unlimited access   Try this link to see an example of the output  this is in json  output is also available in XML   https   maps googleapis com maps api geocode json latlng 40 714224 -73 961452 amp sensor true

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Please check the below answer  It works for me  if navigator geolocation        navigator geolocation getCurrentPosition function position            initialize position coords latitude position coords longitude               function initialize lat lng          directionsDisplay   new google maps DirectionsRenderer rendererOptions         directionsService   new google maps DirectionsService        var latlng   new google maps LatLng lat  lng          alert latlng       getLocation latlng      function getLocation latlng        var geocoder   new google maps Geocoder        geocoder geocode   latLng   latlng   function results  status                if  status    google maps GeocoderStatus OK                    if  results 0                         var loc   getCountry results                       alert  location is    loc                                                   function getCountry results        for  var i   0  i  lt  results 0  address components length  i                  var shortname   results 0  address components i  short name          var longname   results 0  address components i  long name          var type   results 0  address components i  types          if  type indexOf  country      -1                        if   isNullOrWhitespace shortname                                 return shortname                            else                               return longname                                    function isNullOrWhitespace text        if  text    null            return true            return text replace   s gi      length  lt  1

User · Answer

An Open Source alternative is Nominatim from Open Street Map   All you have to do is set the variables in an URL and it returns the city country of that location  Please check the following link for official documentation  Nominatim

User · Answer

Loc2country is a Golang based tool that returns the ISO alpha-3 country code for given location coordinates  lat lon   It responds in microseconds  It uses a geohash to country map    The geohash data is generated using georaptor   We use geohash at level 6 for this tool  i e   boxes of size 1 2km x 600m

User · Answer

I spent about an 30min trying to find a code example of how to do this in Javascript  I couldn t find a quick clear answer to the question you posted  So    I made my own  Hopefully people can use this without having to go digging into the API or staring at code they have no idea how to read  Ha if nothing else I can reference this post for my own stuff   Nice question and thanks for the forum of discussion   This is utilizing the Google API    lt script src    ajax googleapis com ajax libs jquery 1 9 1 jquery min js  gt  lt  script gt   lt script type  text javascript  src  http   maps googleapis com maps api js key  lt YOURGOOGLEKEY gt  amp sensor false amp v 3 amp libraries geometry  gt  lt  script gt         CHECK IF BROWSER HAS HTML5 GEO LOCATION if  navigator geolocation        navigator geolocation getCurrentPosition function  position               GET USER CURRENT LOCATION         var locCurrent   new google maps LatLng position coords latitude  position coords longitude              CHECK IF THE USERS GEOLOCATION IS IN AUSTRALIA         var geocoder   new google maps Geocoder                geocoder geocode    latLng   locCurrent    function  results  status                    var locItemCount   results length                  var locCountryNameCount   locItemCount - 1                  var locCountryName   results locCountryNameCount  formatted address                   if  locCountryName     Australia                           SET COOKIE FOR GIVING                     jQuery cookie  locCountry   locCountryName    expires  30  path

User · Answer

I was searching for a similar functionality and I saw the data  http   download geonames org export dump   shared on earlier reply  thank you for sharing  it is an excellent source   and implemented a service based on the cities1000 txt data   You can see it running at  http   scatter-otl rhcloud com location lat 36 amp long -78 9  broken link  Just change the latitude and longitude for your locations   It is deployed on OpenShift  RedHat Platform   First call after a long idle period may take sometime  but usually performance is satisfactory   Feel free to use this service as you like     Also  you can find the project source at https   github com turgos Location

User · Answer

If you are using Google s Places API  this is how you can get country and city from the place object using Javascript   function getCityAndCountry location      var components         for var i   0  i  lt  location address components length  i          components location address components i  types 0     location address components i  long name         if  components  country          console warn  Couldn  t extract country        return false         if components  locality          return  components  locality    components  country         else if components  administrative area level 1          return  components  administrative area level 1    components  country         else       console warn  Couldn  t extract city        return false

User · Answer

You can use Google Geocoding API  Bellow is php function that returns Adress  City  State and Country  public function get location  latitude      longitude            geolocation    latitude      longitude       request    http   maps googleapis com maps api geocode json latlng    geolocation   amp sensor false         file contents   file get contents  request        json decode   json decode  file contents       if isset  json decode- gt results 0               response   array            foreach  json decode- gt results 0 - gt address components as  addressComponet                if in array  political    addressComponet- gt types                          response      addressComponet- gt long name                                    if isset  response 0      first      response 0      else    first     null             if isset  response 1      second     response 1      else    second    null              if isset  response 2      third      response 2      else    third     null             if isset  response 3      fourth     response 3      else    fourth    null             if isset  response 4      fifth      response 4      else    fifth     null                loc  address        loc  city        loc  state        loc  country               if   first     null   amp  amp   second     null   amp  amp   third     null   amp  amp   fourth     null   amp  amp   fifth     null                   loc  address      first               loc  city      second               loc  state      fourth               loc  country      fifth                    else if    first     null   amp  amp   second     null   amp  amp   third     null   amp  amp   fourth     null   amp  amp   fifth     null                    loc  address      first               loc  city      second               loc  state      third               loc  country      fourth                    else if    first     null   amp  amp   second     null   amp  amp   third     null   amp  amp   fourth     null   amp  amp   fifth     null                   loc  city      first               loc  state      second               loc  country      third                    else if    first     null   amp  amp   second     null   amp  amp   third     null   amp  amp   fourth     null   amp  amp   fifth     null                    loc  state      first               loc  country      second                    else if    first     null   amp  amp   second     null   amp  amp   third     null   amp  amp   fourth     null   amp  amp   fifth     null                    loc  country      first                          return  loc

User · Answer

I ve used Geocoder  a good Python library that supports multiple providers  including Google  Geonames  and OpenStreetMaps  to mention just a few  I ve tried using the GeoPy library  and it often gets timeouts  Developing your own code for GeoNames is not the best use of your time and you may end up getting unstable code  Geocoder is very simple to use in my experience  and has good enough documentation  Below is some sample code for looking up city by latitude and longitude  or finding latitude longitude by city name   import geocoder  g   geocoder osm  53 5343609  -113 5065084   method  reverse   print g json  city     Prints Edmonton  g   geocoder osm  Edmonton  Canada   print g json  lat    g json  lng     Prints 53 5343609  -113 5065084

User · Answer

I know this question is really old  but I have been working on the same issue and I found an extremely efficient and convenient package  reverse geocoder  built by Ajay Thampi  The code is available here  It based on a parallelised implementation of K-D trees which is extremely efficient for large amounts of points  it took me few seconds to get 100 000 points   It is based on this database  already highlighted by  turgos   If your task is to quickly find the country and city of a list of coordinates  this is a great tool

[geolocation] Given the lat/long coordinates, how can we find out the city/country?

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