Accuracy versus decimal places at the equator decimal degrees distance places ——————————- 0 1.0 111 km 1 0.1 11.1 km 2 0.01 1.11 km 3 0.001 111 m 4 0.0001 11.1 m 5 0.00001 1.11 m 6 0.000001 0.111 m 7 0.0000001 1.11 cm 8 0.00000001 1.11 mm ref : https://en.wikipedia.org/wiki/Decimal_degrees#Precision
What you are looking for is called reverse geocoding. Google provides a server-side reverse geocoding service through the Google Geocoding API, which you should be able to use for your project. This is how a response to the following request would look like: http://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&sensor=false Response: { “status”: “OK”, “results”: [ { “types”: [ “street_address” ], … Read more
First you need to define a LocationListener to handle location changes. int LOCATION_REFRESH_TIME = 15000; // 15 seconds to update int LOCATION_REFRESH_DISTANCE = 500; // 500 meters to update …. private final LocationListener mLocationListener = new LocationListener() { @Override public void onLocationChanged(final Location location) { //your code here } }; Then get the LocationManager and … Read more
The number of kilometers per degree of longitude is approximately (pi/180) * r_earth * cos(theta*pi/180) where theta is the latitude in degrees and r_earth is approximately 6378 km. The number of kilometers per degree of latitude is approximately the same at all locations, approx (pi/180) * r_earth = 111 km / degree So you can … Read more
/** * Get ISO 3166-1 alpha-2 country code for this device (or null if not available) * @param context Context reference to get the TelephonyManager instance from * @return country code or null */ public static String getUserCountry(Context context) { try { final TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); final String simCountry = tm.getSimCountryIso(); if (simCountry … Read more
You can use my service, http://ipinfo.io, for this. It will give you the client IP, hostname, geolocation information (city, region, country, area code, zip code etc) and network owner. Here’s a simple example that logs the city and country: $.get(“https://ipinfo.io”, function(response) { console.log(response.city, response.country); }, “jsonp”); Here’s a more detailed JSFiddle example that also prints … Read more
Here is a javascript function: function measure(lat1, lon1, lat2, lon2){ // generally used geo measurement function var R = 6378.137; // Radius of earth in KM var dLat = lat2 * Math.PI / 180 – lat1 * Math.PI / 180; var dLon = lon2 * Math.PI / 180 – lon1 * Math.PI / 180; var … Read more
Use the LocationManager. LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); double longitude = location.getLongitude(); double latitude = location.getLatitude(); The call to getLastKnownLocation() doesn’t block – which means it will return null if no position is currently available – so you probably want to have a look at passing a LocationListener to the requestLocationUpdates() method … Read more
The approximate conversions are: Latitude: 1 deg = 110.574 km Longitude: 1 deg = 111.320*cos(latitude) km This doesn’t fully correct for the Earth’s polar flattening – for that you’d probably want a more complicated formula using the WGS84 reference ellipsoid (the model used for GPS). But the error is probably negligible for your purposes. Source: … Read more
You would do something like that using Google API. Please note you must include the google maps library for this to work. Google geocoder returns a lot of address components so you must make an educated guess as to which one will have the city. “administrative_area_level_1” is usually what you are looking for but sometimes … Read more