geolocation

How to create Polygon Geofence from multiple geo locations(long,lat values) . Also how to track user is entering into this geofence region or exiting from this region on android. matthewrdev A geofence is simply an array of lat/long points that form a polygon. Once you have a list of lat/long points, you can use a point-inside-polygon check to see if a location is within the polygon. This is code I have used in my own projects to perform point-in-polygon checks for very large concave polygons (20K+ vertices): public class PolygonTest { class LatLng { double Latitude; double Longitude; LatLng

I borrowed the following method from somewhere on the internet (Can't remember where). But its doing a straight forward process, finding the distance between two gps points. It works just fine, except that it may be a little slow, as I'm running it across millions of points. I was wondering if anyone knows an approach that would be computationally less expensive. The accuracy needs to be in the general area of 'correct' but doesn't need to be 100% accurate. private double distFrom(double lat1, double lng1, double lat2, double lng2) { double earthRadius = 3958.75; double dLat = Math.toRadians

I would like to hide() or show() a button that allows users to use their current location based on whether or not they are currently allowing location to be used in their browser setting. the below code only checks if the browser supports geolocation and not whether or not the particular user is allowing it. if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(showPosition); } else { x.innerHTML="Geolocation is not supported by this browser.";} } Is there a boolean value that I can detect for their browser setting letting me know if location is currently allowed? thanks for

I've been working with PhoneGap and it's been great, but I've run into a problem with getting location on a Verizon Droid w/ 2.0.1 (works as expected on a G1 w/ 1.6). GeoLocation API Support was added to Android in 2.0 (Eclair) and it works in the default browser on a Verizon Droid (on 2.0.1). That is, if I visit a website that calls navigator.geolocation.getCurrentPosition(success_callback, error_callback), the device prompts that the current domain "wants to know your location" in a dialog with options to "Share location" or "decline". If I select "Share location", success_callback

I am using the following code to get the current location namely (latitude and longitude), but I am not getting current location (latitude and longitude). Anyone knows why? package com.ram.currentlocation; import android.app.Activity; import android.content.Context; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.widget.Toast; public class Location_Gps extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super

I am writing a site that basically looks for places within a 25 mile radius of a lat and long using php and mysql. I am wondering how something like this would work? I would pass a lat and long to the scrip and have it pull out only locations that are within 25 miles of the lat and long from my Database of locations. What is the best way to do this? EDIT: I found this code for calculating the distance between 2 points. function distance($lat1, $lon1, $lat2, $lon2, $unit) { $theta = $lon1 - $lon2; $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *