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POWindows Phone 7 GetDistanceTo() returns incorrect distance
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  1. POWindows Phone 7 GetDistanceTo() returns incorrect distance
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    copied!<p>I am developing a small Windows Phone application. I am storing the current location of user in the database.</p> <p>Here is the code to retrieve the current location which is stored in database.</p> <pre><code>public void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs&lt;GeoCoordinate&gt; e) { CurrentLatitude = e.Position.Location.Latitude.ToString(); CurrentLongitude = e.Position.Location.Longitude.ToString(); } </code></pre> <p>We need to allow user to do some activity if he is under the 400 meters from his saved location. </p> <p>I am using the following code to calculate the distance.</p> <pre><code>internal double GetDistanceTo(GeoCoordinate ClientLocation) { double distanceInMeter; GeoCoordinate currentLocation = new GeoCoordinate(Convert.ToDouble(watcher.Position.Location.Latitude.ToString()), Convert.ToDouble(watcher.Position.Location.Longitude.ToString())); distanceInMeter = currentLocation.GetDistanceTo(ClientLocation); return distanceInMeter; } </code></pre> <p>ClientLocation : is the location saved in the database.</p> <p>So my problem is that it gives extremly large distance even the user is standing at the same location(under 1 meter) which is saved in the database.</p> <p>Example cordinates (extracted from device) </p> <p>Saved in Database </p> <blockquote> <p>Lat : 29.8752546310425<br> Long: 73.8865985870361</p> </blockquote> <p>Current Cordinates</p> <blockquote> <p>Lat : 29.8734102249146<br> Long :73.9049253463745</p> <p>Distance 1780.45</p> </blockquote> <p>Could anybody suggest me what is wrong here or a better way to get the distance between two coordinates?</p>
 

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