Unexpected leaving_datetime in detection.stay_locations

[hamishgibbs]

Hello, I am receiving unexpected behavior from detection.stay_locations.

When a stay ends, leaving_datetime is the datetime value of the first point outside of the spatial radius, not the final point within the spatial radius.

A toy example is available here.

In this example, there is one stay at the lat/lng coordinates (1, 1) for datetime 2018-01-01 00:00 to 2018-01-01 00:06. I would expect the leaving_datetime of this visit to be 2018-01-01 00:06, however, in this example it is actually the datetime of the following point in the sequence: 2018-01-01 00:23.

Using the datetime of the first point outside the spatial radius may not introduce much difference in the duration of visits for a regularly sampled time series, but for an irregular time series it can produce an inaccurate duration.

Is this a bug or an intentional design choice?

Thank you for your assistance.