[OSM-talk] Comparing Google and OSM

[Sven Grüner]

Rick Collins schrieb:
> I am curious.  What makes you think your GPSr is not accurate?  Do you
> see clear differences between your unit and others?  What model do you
> have?

It's an eTrex yellow, 1st genration. Trackpoints are set by very crude
sheme and the GPX is useless without the lines drwan between each point.

And it's inaccurateness can be easily spotted by driving through a road
twice and doing some rectangular movement in between. In the suburbs,
with broad streets and low buildings the offset isn't usually more than
10-20m. But downtown with multistorey-houses right behind the streetedge
it's offten beyond fifty meters.

That are days with good satellite constellation, but I've also spend
afternoons with creating totally useless tracks because the offset was
bigger (and constantly changing) than the gap between two parallel streets.

That's why I was not surprised when seeing a difference between my and
Google's data.

MfG, Sven