[OSM-talk] augmenting contour data with gps track logs
andrzej zaborowski
balrogg at gmail.com
Tue Dec 29 04:26:58 GMT 2009
2009/12/28 Robin Paulson <robin.paulson at gmail.com>:
> 2009/12/28 Frederik Ramm <frederik at remote.org>:
>> Pure GPS elevation is worthless due to bad precision (for technical reasons,
>> Z measurement is much worse than X/Y measurement in GPSes). Some GPSes have
>
> ok, i didn't realise that. what levels of bad precision are we talking
> about; i assume it varies form model to model; how does it compare to
> the precision of srtm?
Attached is a plot of my bike ride with three devices (different
models unfortunately) recording altitudes. (x is degrees longitude, y
metres)
One thing to consider when using the traces from osm's collection is
that not all of them are recorded on the ground level, there are at
least a couple of airplane traces and a paraglider trace.
Cheers
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