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GPS Curve Logging


GPS curve logging is based on the Ramer-Douglas-Peucker algorithm, with each run of the curve being considered as an isolated atomic event. The reasons the curve algorithm is run is dependant on several factors, either;

  1. The curve buffer became full, this is also considered a timeout event.
  2. The actual position of the GO device differed excessively from the predicted position of the GO device.
  3. The actual speed of the GO device differed excessively from the predicted speed of the GO device.
  4. Another event triggered the running of the curve.

GPS Curve Logging Log Reasons


Log Reason

Description

CurveBased

This GPS point was logged by running the curve algorithm on the GPS positional data.

CurveSpeed

This GPS point was logged by running the curve algorithm on the GPS speed data. If the GPS valid flag is marked as invalid then the speed was received from the engine.

CurvePositionEstimateError

The curve algorithm was run up until this point because the difference between the actual position of the vehicle and the estimated position of the vehicle (based on the last set of data sent to MyGeotab) is greater than the allowed threshold.

CurveSpeedEstimateError

The curve algorithm was run up until this point because the difference between the actual speed of the vehicle and the estimated speed of the vehicle (based on the last set of data sent to MyGeotab) is greater than the allowed threshold. If the GPS valid flag is marked as invalid then the speed was received from the engine.

CurveTimeOut

The curve algorithm was run up until this point because the timeout value of 100 seconds was reached.

CurveOtherEvent

The curve algorithm was run up until this point because of a non-GPS based event, currently only includes the saving of a system fault.

CurveZeroSpeed

This GPS point was logged because the vehicle either came to a stop or started moving from a stop. If the GPS valid flag is marked as invalid then the speed was received from the engine.


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