[racket] moby/phonegap/android: use acceleration or geolocation to derive velocity?

Thanks Noel - the scale would be meters rather, but I somehow assumed that this might be too small-scale for GPS ...

I guess I really ought to compare both measures, but for the GPS part, I wonder what would be the most "architecturally adequate" way to adapt 'world-updater' s contract to handle the additional geolocation field (and the other fields currently unused, possibly).

ciao,
Sigrid



Am 02.11.2010 um 22:08 schrieb Noel Welsh:

> I don't /really/ know, but isn't one reading from the accelerometer
> and the other from GPS? The answer depends, I think, on the distance
> over which you want to operate. If you want velocity from, e.g., hand
> movements, the accelerometer is the way to go. If you want velocity
> over large scale (metres, kms) use GPS.
> 
> HTH,
> N.
> 
> On Tue, Nov 2, 2010 at 5:52 PM, keydana at gmx.de <keydana at gmx.de> wrote:
>> 
>> Hi,
>> I am wondering how best to calculate velocity in a moby/phonegap/android application.
>> In general, would anyone have experience (or intuition) whether velocity might better be calculated from the acceleration values delivered by phonegap's Acceleration object, or directly be extracted from the Position object returned from Geolocation (it has a field 'velocity')?