Hello, On Thu, 08 Jan 2009 00:12:53 +0100 Ronan Daniellou <[email protected]> wrote:
> please could someone confirm the units returned by Gypsy:
>
> * time stamp
> What is the unit? The amount in seconds elapsed since the epoch (I
> have seen time.gmtime() being called upon it)?
To tell you the truth, I'm not so sure any more...
We're sending seconds since epoch and I think gypsy is doing the same.
> * speed
> in knots.
> * heading
> in decimal degree?
Yes.
> * climb
> in meter?
It's currently also in knots, a positive value meaning the device is
descending. This is probably not right, though....
Only UBX devices currently report this value, the NMEA parser lacks a
calculation for it.
The gypsy source only contains the following:
gypsy_client_set_course (ctxt->client, course_fields, speed,
direction, 0.0);
So it seems they're not even setting the climb value. Since I
couldn't find anything in the documentation either we're back to
guessing. :-(
> * lat, lon
> decimal degrees.
> * alt
> in meter.
Correct
> * pdop, hdop, vdop
> values between 1 and 50.
It's a unitless number specifying how good the geometry of the
satellites used for tracking is.
A lower number means better accuracy.
Regards,
Daniel Willmann
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