A stretch of the distance axis on the map line, by the gpsSpans:
the part with fixes, from the first fix at or after startMeters to the
last at or before endMeters. Null when no fix falls inside it.
The result is in raw-line metres: to slice a simplified polyline pass
domainTotal (the last span's lineEndMeters) to polylineSlice.
Use this, not domainTotal alone, when the summary has gpsSpans — a
proportional rescale would spread the line over metres it never covered.
A stretch of the distance axis on the map line, by the gpsSpans: the part with fixes, from the first fix at or after
startMetersto the last at or beforeendMeters. Null when no fix falls inside it.The result is in raw-line metres: to slice a simplified polyline pass
domainTotal(the last span'slineEndMeters) to polylineSlice. Use this, notdomainTotalalone, when the summary hasgpsSpans— a proportional rescale would spread the line over metres it never covered.