[OSM-talk] Strange GPS trace - drifting?

[Barry Crabtree]

Thanks all. I feel happier about going round again!

One other question though - is there any way to predict when this might
happen in an area?

Cheers. Baz.

On 10/31/06, raphael Jacquot <sxpert at sxpert.org> wrote:
>
> Barry Crabtree wrote:
> > Hi
> >
> > I've been out mapping round a local residential area. Everything seemed
> ok
> > plenty of satellites in view, but when I look at the trace it seems that
> > over the space of a few minutes it has shifted what looks like about
> 50/100
> > metres. I've put a screenshot of the trace at
> > http://wiki.openstreetmap.org/index.php/Image:Grangefarm-wierd.jpg but
> > haven't uploaded the gpx file because it doesn't look right!
> >
> > Any thoughts on what might have happened. I've been collecting traces
> for a
> > month & this is the first time I've seen anything like this. Have I done
> > something stupid?
> >
> > Cheers. Baz.
>
> no, that's relatively classic. the satellites moved between pass1 and
> pass2...
> your best bet is to handle the part to the right, and go over it another
> day for the left part.
> I have that pretty pronounced in the mountains. my solution is just to
> go a couple times more, that eventually gives me better data.
> of course, the real solution would be to do phase correction
> post-calculations with two gps receivers, one fixed, one moving
>



-- 
Live as if you were to die tomorrow. Learn as if you were to live
forever.  - Gandhi.
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