From the picture you posted, it say it’s disabled… Go to the Developer Console Navigate to Google Maps -> APIs Search for Geocoding and click on Google Maps Geocoding API -> Enable API. Do the same thing for Geolocating
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
No, there is not really any other way : if you have many locations and want to display them on a map, the best solution is to : fetch the latitude+longitude, using the geocoder, when a location is created store those in your database, alongside the address and use those stored latitude+longitude when you want … Read more
I suggest to approximate locally the Earth surface as a sphere with radius given by the WGS84 ellipsoid at the given latitude. I suspect that the exact computation of latMin and latMax would require elliptic functions and would not yield an appreciable increase in accuracy (WGS84 is itself an approximation). My implementation follows (It’s written … Read more
The GeoCoordinate class (.NET Framework 4 and higher) already has GetDistanceTo method. var sCoord = new GeoCoordinate(sLatitude, sLongitude); var eCoord = new GeoCoordinate(eLatitude, eLongitude); return sCoord.GetDistanceTo(eCoord); The distance is in meters. You need to reference System.Device.
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 … Read more
Not long ago I wrote an example of the haversine formula, and published it on my website: /** * Calculates the great-circle distance between two points, with * the Haversine formula. * @param float $latitudeFrom Latitude of start point in [deg decimal] * @param float $longitudeFrom Longitude of start point in [deg decimal] * @param … Read more
I looked fairly deeply into this question for a project I am working on. GeoNames.org and EarthTools.com are both good options for many situations but with the following serious flaws: GeoNames.org finds the time zone by searching for the nearest point in their database that contains a time zone field. This often leads to the … Read more
Here is a Java implementation of Haversine formula. I use this in a project to calculate distance in miles between lat/longs. public static double distFrom(double lat1, double lng1, double lat2, double lng2) { double earthRadius = 3958.75; // miles (or 6371.0 kilometers) double dLat = Math.toRadians(lat2-lat1); double dLng = Math.toRadians(lng2-lng1); double sindLat = Math.sin(dLat / … Read more
Update: 04/2018: Vincenty distance is deprecated since GeoPy version 1.13 – you should use geopy.distance.distance() instead! The answers above are based on the Haversine formula, which assumes the earth is a sphere, which results in errors of up to about 0.5% (according to help(geopy.distance)). Vincenty distance uses more accurate ellipsoidal models such as WGS-84, and … Read more