Research Article
Assessment of Smartphone Positioning Data Quality in the Scope of Citizen Science Contributions
Table 5
Aggregate features from the trip segments.
| Name | Feature | Description |
| Collected GNSS | Number of GNSS locations | It is the actual number of collected measurements. | Expected GNSS | Theoretical number of GNSS locations | Having a sampling rate of 1 Hz, in theory, the number of GNSS locations to collect is equal to trip segment duration in seconds. | TTFF | Time to first fix | Time difference between the trip segment starting time and the first measurement timestamp. | Missing GNSS | Number of missing GNSS locations | Difference between the expected and collected GNSS. |
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