I’m trying to compare National Weather Service Rapid Update Forecast (RAP) data
to GPS breadcrumbs collected by a really clever Apple Phone Ap that lays down
longitude, latitude, altitude, compass direction, and speed every six seconds.
Below is a small subset of the GPS data from another flight.
I want to delete the rows where the balloon does not move (Speed column) for a
full minute assuming that it is sitting on the ground – beginning of the
flight, changing passengers, or waiting for the chase crew at the end of the
flight. for example, I want to eliminate the data for minute 30 but keep the
data for minute 31 because the balloon starts to move again at second 17. Any
suggestions? I’ve tried putzing around with multiple lags without success.
Minute Second Speed
29 47 0
29 53 0
29 59 0
30 5 0
30 11 0
30 17 0
30 23 0
30 29 0
30 35 0
30 41 0
30 47 0
30 53 0
30 59 0
31 5 0
31 11 0
31 17 0.402649
31 23 0.671081
31 29 1.588225
31 35 2.438261
31 41 2.706693
31 47 2.930386
31 53 3.310666
31 59 3.198819
32 5 3.422512
It would be even better if I could delete the rows where there were ten
consecutive zero speed entries such as from minute 30 second 17 to minute 31
second 11.
Thanks,
Philip Heinrich
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