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POIssue in finding the speed when using CLLocationManager
 

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  1. POIssue in finding the speed when using CLLocationManager
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    <p>I am developing a speedometer application in iPhone. I have used CLLocationManager(GPS based) to measure the speed of a vehicle. But i don't get accurate speed. I have tried all the filtering methods given in various stackoverflow discussions. But i don't get any improvement. At times, the speed reaches to a greater value(>400kmph).</p> <p>I dont know what goes wrong. Please suggest me any code to get the accurate speed.</p> <p>Thanks in advance,</p> <p>I have followed the below mentioned stack over flow discussions</p> <p><a href="https://stackoverflow.com/questions/1994018/measuring-velocity-via-iphone-sdk">Measuring velocity via iPhone SDK</a></p> <p><a href="https://stackoverflow.com/questions/1081219/optimizing-cllocationmanager-corelocation-to-retrieve-data-points-faster-on-the-i">Optimizing CLLocationManager/CoreLocation to retrieve data points faster on the iPhone</a></p> <p><a href="https://stackoverflow.com/questions/1391589/cllocation-speed">CLLocation speed</a></p> <p><a href="https://stackoverflow.com/questions/1180050/why-is-my-cllocation-speed-so-inaccurate">Why is my CLLocation speed so inaccurate?</a></p> <p>I have currently implemented the following code:</p> <pre><code>//locationManager declaration in ViewDidLoad locManager=[[CLLocationManager alloc]init]; locManager.delegate =self; [locManager startUpdatingLocation]; - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSTimeInterval locationAge = abs([newLocation.timestamp timeIntervalSinceNow]); if (locationAge &gt; 5.0) return; if (newLocation.speed &lt; 0 || newLocation.horizontalAccuracy &lt; 0) return; if ((newLocation.horizontalAccuracy &lt; (oldLocation.horizontalAccuracy - 10.0)) || (newLocation.horizontalAccuracy &lt; 50.0)|| (newLocation.horizontalAccuracy &lt;= 150.0)) { if(oldLocation != nil) { CLLocationDistance distanceChange = [newLocation distanceFromLocation:oldLocation]; NSTimeInterval sinceLastUpdate = [newLocation.timestamp timeIntervalSinceDate:oldLocation.timestamp]; double calculatedSpeed; calculatedSpeed = (distanceChange / sinceLastUpdate)*3.6; // to convert the speed into kmph. } } } </code></pre>
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    1. COPlease provide links to the referenced StackOverflow discussions, so no-one wastes your time with solutions you've already discarded as unacceptable. Also, please post the code you are using now.
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      1. POIssue in finding the speed when using CLLocationManager
      1. USJeremy W. Sherman
    2. COHi Jeremy, Now i have added the code i have used. Kindly review it.
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