CODEWITHSUNDEEP
windows-phone-8windows-phone-8.1windows-phonebing-maps
megamind
megamind

Reputation: 444

distance between two geopoints changing continiuosly?

I am calculation distance between a fix geopoint and my phone current location using haversine formula inside geolocator.poistionchanged event. But the phone's current geocoordinates are changing without moving the phone and the distance is varying greatly. How can i fix this problem or at least reduce it?

Upvotes: 0

Views: 50

Answers (2)

rbrundritt
rbrundritt

Reputation: 17954

Most GPS chips in mobile devices have an accuracy of 15 meters. As such the position it reports often jumps around, especially if there are tall buildings around.

If you are indoors, the GPS likely isn't getting a signal, so the phone would then fall back to WIFI positioning which has an accuracy of about 100 meters.

If GPS and wifi can't be used for some reason, the phone will then fall back to IP address which, at best is accurate to the city.

Now, assuming you have good GPS signal, the way to reduce the noise is to make use of the movement threshold and the report interval. Here is a good blog post about these options:

https://blogs.windows.com/buildingapps/2012/12/03/geoposition-advanced-tracking-scenarios-for-windows-phone-8/#uljhzpK0wllquFRi.97

Upvotes: 2

Ehsan Chavoshi
Ehsan Chavoshi

Reputation: 725

Your phone location is determined from your GPS seonsors ,

The U.S. government is committed to providing GPS to the civilian community at the performance levels specified in the GPS Standard Positioning Service (SPS) Performance Standard. For example, the GPS signal in space will provide a "worst case" pseudorange accuracy of 7.8 meters at a 95% confidence level. (This is not the same as user accuracy; pseudorange is the distance from a GPS satellite to a receiver.) Reffrence

So i think you should rond your data to get same data when phone not moved. Also you may use another source like Wifi to get location.

i'm not a WP Developer. a windows developer may help you better.

Upvotes: 1

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