Loading the geosphere package you can use a number of different functions library(geosphere) distm(c(lon1, lat1), c(lon2, lat2), fun = distHaversine) Also: distHaversine() distMeeus() distRhumb() distVincentyEllipsoid() distVincentySphere() …
Based on another question on stackoverflow, I got this code.. This calculates the result in meters, not in miles 🙂 public static float distFrom(float lat1, float lng1, float lat2, float lng2) { double earthRadius = 6371000; //meters double dLat = Math.toRadians(lat2-lat1); double dLng = Math.toRadians(lng2-lng1); double a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) … Read more
http://developer.android.com/reference/android/location/Location.html Look into distanceTo Returns the approximate distance in meters between this location and the given location. Distance is defined using the WGS84 ellipsoid. or distanceBetween Computes the approximate distance in meters between two locations, and optionally the initial and final bearings of the shortest path between them. Distance and bearing are defined using the … Read more
Using double has enough precision for accurate lat/lon down to inches for 6-7 decimal places. In aviation, if decimal degrees are used, they typically go to at least 7 decimal places. In our NASA simulations, lat/lon data are doubles while all other attitude and altitude are floats. In other words, the 6th decimal place for … Read more
Start by Comparing the distance between latitudes. Each degree of latitude is approximately 69 miles (111 kilometers) apart. The range varies (due to the earth’s slightly ellipsoid shape) from 68.703 miles (110.567 km) at the equator to 69.407 (111.699 km) at the poles. The distance between two locations will be equal or larger than the … Read more
Needed to convert answers from radians back to degrees. Working code below: import math R = 6378.1 #Radius of the Earth brng = 1.57 #Bearing is 90 degrees converted to radians. d = 15 #Distance in km #lat2 52.20444 – the lat result I’m hoping for #lon2 0.36056 – the long result I’m hoping for. … Read more
Fair Warning! Before taking the advice to use the GEOGRAPHY type, make sure you are not planning on using Linq or Entity Framework to access the data because it’s not supported (as of November 2010) and you will be sad! Update Jul 2017 For those reading this answer now, it is obsolete as it refers … Read more
The Java code given by Dommer above gives slightly incorrect results but the small errors add up if you are processing say a GPS track. Here is an implementation of the Haversine method in Java which also takes into account height differences between two points. /** * Calculate distance between two points in latitude and … Read more
This is called Reverse Geocoding Documentation from Google: http://code.google.com/apis/maps/documentation/geocoding/#ReverseGeocoding. Sample Call to Google’s geocode Web Service: http://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&sensor=true&key=YOUR_KEY
Go for double, there are several reasons. Trigonometric functions are available only for double Precision of double (range of 100 nanometers) is far beyond anything you’ll ever require for Lat/Lon values GeoCoordinate Class and third-Party modules (e.g. DotSpatial) also use double for coordinates