[OSM-newbies] R: new to OSM editing - advice on coping with gpx /POTLATCH offset

[Fabrizio Carrai]

Hi JW,
5/10 meters fall in the typical error of the GPS system. I'm pretty
confident that if you repeat your tracking several times, you will have a
beam of not linear ways or a "spot" of nodes localtions.
To be precise we do need several measurements. The truth is in the average.

Although I have no idea on the calibration methods of the Yahoo maps, surely
they will also have an error.

Ciao
	Fab

> -----Messaggio originale-----
> Da: newbies-bounces at openstreetmap.org
> [mailto:newbies-bounces at openstreetmap.org]Per conto di JW
> Inviato: giovedi 15 gennaio 2009 1.48
> A: newbies at openstreetmap.org
> Oggetto: [OSM-newbies] new to OSM editing - advice on coping with
> gpx /POTLATCH offset
>
>
> Hi all
>
> I started small by adding some .gpx data
> (Blackberry curve / bbtracker.org app)
> to local maps in areas which i know well.
> This area has been mapped
> previously by someone using potlatch and the
> yahoo available satellite photos (UK)
>
> It turns out that there seems to be an
> offset between potlatch  locations and
> .gpx data i record - maybe 5 to 10m or so.
>
>
> There are a few courses of action
>
> 1) trust my phone gps .gpx data is correct
> and change all potlatch locations as
> i can..... this is not practical for
> a small edit added to a large mapped area
>
> 2) don't worry about it this is
> within normal gps errors ..... just "interpret"
> where the footpath is and add it beside the potlatch road.
>
> 3) something else?
>
> What do others do?
>
> Ciao
> JW
>
>
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