[OSM-newbies] GPS inaccuracy

Martin Kokeš shr3k at typo3-hosting.com
Wed Jun 10 15:18:36 BST 2009


Dne 9.6.2009 12:12, David Read wrote:
> Dear all,
>
> I did my first track last night using my GPS and was surprised to see the trace wandering far from the road I was supposed to be on. See the yellow line here:
> http://tinypic.com/view.php?pic=25q662s&s=5
> I was cycling in a pretty straight line down the road I can assure you! Yet the line goes up to 20m either side of the map line.
>
> Anyway, I did this with my Nokia 95 and WhereAmI+ software (will try Sports Tracker next too), but this wild result doesn't seem good enough to do mapping with.
>
> Is this because I have a rubbish GPS receiver or could it be that the buildings of Islington are causing sufficient reflection/disturbance to the signal?

Try to use some software with Kalman filter processing (Efficasoft GPS 
Utilities) and use external sensitive GPS receiver (chipset MTK 66ch 
–162dBm with good antenna, i.e. Qstarz BT-Q818X).

MK





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