Hi Steve,

Very interesting analysis!  Thanks for doing this.

The home elevation here is 371 meters (1220 ft, per the topo map), so really close to your guess.  As to the nighttime effects, we've had some annoyingly cloudy behavior at night (I'm a frustrated backyard astronomer), so perhaps that atmospheric lake may have had an effect.  Or, I usually go to bed around midnight, so perhaps that's when the car sneaks out for a night on the town?  The bedrooms above the garage are currently unoccupied, however, so it's not due to activity directly above.  Charging is not on a timer, so that's not it, but the car does remain plugged in 24/7.  It's top-off charging cycle is pretty variable.

From the weather station, here is the last week's temperature & dew point graph (with temp vs dew point serving as a proxy for humidity).  There was 0.10" of rain (thunderstorm) on the 1st, in the late evening if I recall.



{shrug}

Greg


Stephen Casner wrote:
Greg,

Attached are graphs of your data.  gregd.all.png shows all of the
data, and gregd.peak.png is the highest distance deviation of 369
meters, which is less than the default 500 meter threshold.

It looks like there is a diurnal pattern to the data with increased
deviations around midnight local time (the X axis times are UTC).

It also looks like your home elevation must be about 380 meters since
the altitude variable drops down to negative that amount frequently,
which would occur when that value is taken as zero (there is a special
case in the code to treat some values as zero).

I tried overlaying my data and yours, but there seems to be no
correlation between the peaks in my data and the peaks in yours.
Interestingly, my data does not show a similar diurnal pattern.

                                                        -- Steve

On Tue, 4 Jun 2019, Greg D. wrote:


200mb of logs sent to Steve for analysis....

Greg


Stephen Casner wrote:

Thanks.  For me, today's log was much quieter.  The maximum excursion
was 115 meters and it was roughly coincident with loss of lock.

                                                        -- Steve

On Fri, 31 May 2019, Greg D wrote:


Ok.  I'll let it run for a few days and see what happens. Not planning to drive the car until next week.

Greg


On May 31, 2019 2:11:31 PM PDT, Stephen Casner <casner@acm.org> wrote:

On Fri, 31 May 2019, Greg D. wrote:


Tried this, and am not getting anything written to the file system

(vfs

ls /sd shows zero bytes in gps.crtd).  Did I miss some sort of setup

step?

Nothing gets written (or at least the file size as reported is not
updated) until the recording is stopped with "can log off".

                                                       -- Steve


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