Table 1 Step-wise approach for the spatial classification of GPS points
What temperature zone is used? | Criteria for assigning points spatially compared to the base geospatial data (buildings, roads)? (in order) | What activity classification is assigned? |
|---|---|---|
None. This occurs before zones are considered (all points that fit the criteria are assigned) | Points with speed from the GPS >5 km/hr and within 20 m of a road segment | In Transit |
Flat zone1 (temperature is relatively constant) | Points with GPS speed < 5 km/hr and within 25 m of road segment | In Transit |
Points within 25 m of subjects’ home | Home | |
Points within 5 m of subjects’ school | School | |
Points within 15 m of any other building | Indoors Other | |
Points remaining (unclassified) | Outdoors | |
Transition zone (temperature is changing) | Points with GPS speed < 5 km/hr and within 5 m of road segment | In Transit |
Points within 5 m of subjects’ home | Home | |
Points within 5 m of subjects’ school | School | |
Points within 2 m of any other building | Indoors Other | |
Points remaining (unclassified) | Outdoors |