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Count me in on the fixing... PM me if you need to set up an account.
Mungewell.

One way to relieve the concerns about privacy on the raw data might be to pair adjacent points (so that there is still some direction/speed relationship which is useful in 'seeing' road structures), but otherwise randomize/zero out all other data.

Just to get some idea of how we can improve the data, how do you currently use Google maps (live position display, etc) and why is it lacking??

Where in the world are you (or rather the cars)?
Simon.

So is it possible to render differently depending on locale?

here...
http://osm.virtuelle-loipe.de/loipemap/?zoom=15&lat=49.66724&lon=-114.60483&layers=B000TT

Hi,
I've mapping out my local trails here:

There seems to be a contention between the difficulty colouration, we seem to use green for 'easy' (where you use blue) and blue for 'intermediate' (you use red).

http://www.crowsnestguide.com/allisonwonderlands/allisonmap.html

Cheers,
Simon

I would ask the 'supervisor' to introduce you to a few of the drivers, and explain to them what it is all about. Show them a few maps of Nigeria verse other places and say that they can put 'it' on the map.

Most importantly explain how to turn the GPS on/off, I assume that their first impression is that you want to snoop on them. If they buy into the project that would be a great 'win' for OSM.

Yes, bribes (or 'tokens of appreciation') will work well too... ;-)

If you want to merge/extract or other mess with OSM files you can also use Osmosis...
osm.wiki/Osmosis

and.... when doing your stats you probably want to consider the horizontal plane seperately from the vertical. Elevation accuracy is weaker and will be approaching 2x the error of that for lat/long.

I believe that it is also 'valid procedure' to eliminate outlying data points from your data.

I'll stop typing now... ;-)
Simon.

Oh, you'll need a recent almanac file:
http://www.navcen.uscg.gov/GPS/almanacs.htm

Simon.

As RichardB points out the constellation repeats on an approximately daily basis, but your specific location can affect the performance significantly.

In general you want to have a good sky view, with a fair number of satellites overhead. You can find out the orbits and plan the best time for your 'survey' with a tool such as:
http://www.sokkiagps.com/support/s_planning.php

Another factor would be obstructions around your horizon, which could block signals or cause multipath. The rotation of the receiver/antenna may have effect too.

Did you know you can actually get raw measurements out the Garmins (http://artico.lma.fi.upm.es/numerico/miembros/antonio/async/node3.html), but doing this you could post process the data to find out whether the accuracy is down to the antenna/RF frontend or the positional processing of the micro.

Add in a local reference station and you should be able to get really (for a cheap unit) accurate....
Cheers,
Simon

Good Job. I did some time at the Rutherford Lab (south side of the Harwell site).

Being build on a old airfield the driveway (Fermi Ave on the map) was a bit of a cycle on windy days... ;-)
Mungewell.

oh I should add... you did recompile the compressors with optimisation for your machine, didn't you?