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Mismatch with Google earth
Posted: Fri Jun 03, 2011 10:44 pm
by x3mking
Hi all.. i tryed to import a trackday from my favourite track into Google earth but there is a huge mismatch on my line that i have been driving and google earth.
Im using a external device QStars 818XT 10hz.
As you can see on the picture attached. i promice i havent driven thru the buildings. or been oftrack
Anyone who got any suggestions on why this doesent match to my line? as i really want to analyze to find the right line with my car.
Re: Mismatch with Google earth
Posted: Mon Aug 08, 2011 5:53 pm
by x3mking
anyone got a clue ?
Re: Mismatch with Google earth
Posted: Wed Oct 12, 2011 10:02 pm
by x3mking
x3mking wrote:Hi all.. i tryed to import a trackday from my favourite track into Google earth but there is a huge mismatch on my line that i have been driving and google earth.
Im using a external device QStars 818XT 10hz.
As you can see on the picture attached. i promice i havent driven thru the buildings. or been oftrack
Anyone who got any suggestions on why this doesent match to my line? as i really want to analyze to find the right line with my car.
Still none?
Re: Mismatch with Google earth
Posted: Sat Oct 15, 2011 12:05 am
by NESMotorsports
I have personally found that Google Earth is not very accurate in terms of the image with actual coordinates. I have found this not only when using my QStar 10Hz unit with my iPhone and Harry's Laptimer (both at the track and when laying out a new course using Google Earth before hand) and when overlaying some of my GPS files from my Search and Rescue work when I was using another GPS unit after the fact on Google Earth. The problem is with Google Earth accuracy, not QStar or Harry's Laptimer.
Re: Mismatch with Google earth
Posted: Sat Oct 15, 2011 12:15 am
by Harry
Hi,
It is both. Google Earth is often out of alignment, right. There are quite some tracks with street information that can be overlaid. Even these overlays are deferred.
Looking into the picture above, the problem is a different one. You can see that the whole track gets translated to south east (or north west). This means that relative accuracy is good (shape looks the same), but absolute position is shifted an incorrect. Let see it positive - this effect helps a lot creating reasonable plots and having great timing accuracy. Just think what would happen this translation would take place fix by fix...
@x3mking, can you please post the picture including accuracy (the blue bubbles) - for one lap? Thanks.
- Harry