[talk-au] Uploading traces (Was; Hi all ...)

[John Smith]

--- On Thu, 18/6/09, Ross Scanlon <info at 4x4falcon.com> wrote:
> How do I take your word for it when you use an anonymous
> mail address and
> don't sign your name to any email.

Just because you used a less common alias, how do I even know the name you supply is true?

In reality it doesn't actually matter, trust is a fluid concept that changes shape over time based on past experiences and most importantly what you can prove.

Without proof all we have is the word of someone with an assumed name and a semi-anonymous email account. I could have gone to a lot more trouble if I really wanted to, but you get the idea of where this is heading.
 
> I never said that users with better than consumer grade
> equipment should
> have an automatic right to this.  There would of
> course have to be some
> sort of confirmation of capability by osm.

You mean like proof? :)

Also just because they have access to better equipment, do they exclusively only use that equipment?

How often is it calibrated?

Do they have suitable qualifications to make statements of fact regarding the information they provide?

> What I am saying is that if known high quality data is
> available don't
> degrade it by averaging with known low quality data.

I agree, but it's a safe assumption 95+% of the data supplied to OSM isn't high quality GPS data and for those sections covered by the lower quality data averaging would be useful.

> Hdop is not an indication of distance it is an indication
> of the
> confidence of the accuracy of the position and it is not
> readily
> translated to distance.  So if you had an hdop of 8
> then I would expect
> the position to be very inaccurate.

I agree with you about being a confidence rating, however everything seems to treat this guesstimate of accuracy in terms of this answer is right within a possibility of say 24 metres.

>From all the documentation I've seen, HDOP is treated as the accuracy divided by 6, so if the chip estimates within 24m, the HDOP will be 4.