Research Article

Assessment of Smartphone Positioning Data Quality in the Scope of Citizen Science Contributions

Table 5

Aggregate features from the trip segments.

NameFeatureDescription

Collected GNSSNumber of GNSS locationsIt is the actual number of collected measurements.
Expected GNSSTheoretical number of GNSS locationsHaving a sampling rate of 1 Hz, in theory, the number of GNSS locations to collect is equal to trip segment duration in seconds.
TTFFTime to first fixTime difference between the trip segment starting time and the first measurement timestamp.
Missing GNSSNumber of missing GNSS locationsDifference between the expected and collected GNSS.