[talk-au] Well I bought an L1/L5 Mouse GPS

[Warin]

On 23/6/22 11:45, Alex Sims wrote:
>
> Hi,
>
> I’ve now got a relatively (<$100 + postage) Mouse GPS. It is amazingly 
> accurate. That’s the good news.
>
> Now I can see a whole bunch of streets, buildings etc out by 1-5 
> meters as **some** features were traced without correcting the image 
> offset. Also found my cheap GPS and an OSX machine are not a great 
> combination. GPSD gets confused and ends up with mojibake most times. 
> Virtual serial port is fine in screen, QGIS etc.
>
> Still fun
>
> Alex
>

An error of 1-5 meters ... that would be 'acceptable' at least for most.


I take it you have the GPS antenna in the centre of the street when you 
state the error, trust you don't get run over?

If your doing this by car then you need to travel in both directions and 
take the middle of the two traces.

Having gathered GPS tracks to and from work over some weeks they do vary 
quite considerably with some 'outliers' so you need to be very careful 
if you only have one trace.

Statistically to reduce the uncertainty at least 6 measurements should 
be taken, that would be 6 in one direction and 6 in the other direction...


The newer GPS stuff uses more than one constellation of satellites .. 
and that has improved the accuracy.
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