[Talk-ca] Ground Truthing protocol? --- Re: Accuracy of CanVec vs Yahoo?

[Russell P]

Couldn't you just tag your tracks with accuracy=1m etc?

Russell

On 2010-07-07, at 8:36 AM, "simon at mungewell.org" <simon at mungewell.org> wrote:

>
>> I will be interested to see what all people have to say about this. :)
>>
>> I for one wish I could get access to some survey-grade GPS equipment.  But
>> its just so darn expensive.
>
> Even with expensive equipment the 'tracks' can still be somewhat dubious.
> The biggest problem OSM has is that there's no measure of quality stored
> within the tracks (although it is technically possible to include
> PDOP/HDOP/etc values with the GPX).
>
> Ultimately you have no idea whether I was using a $25,000 L1/L2/RTK system
> or a $150 garmin slung in a back pack, this means that I'm the only one
> who can really say whether my tracks are 'golden'.
>
> Multiple tracks through the same area might hint at a quality measure, but
> also may be subject to the same interference such as multipath and
> obstructions.
>
> Simon.
>
>
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