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Visibility is reported through the met buffer even though the sensor comes from Aanderaa. It is reported in raw engineering units and must be calibrated into meters via a quartic equation.
During normal processing, there are coefficients A, B, C, and D to be retrieved and applied against the raw sensor readings (N) of visibility (and sometimes minimum_visibility and maximum_visibility, which are the extrema of observations during the recording interval) via a simple quartic polynomial expression
A + BN + CN2 + DN3
The coefficients are found in the spec sheet for the MIRA Visibility Sensor 3544.
Raw sensor counts from VIS sensor, visibility_counts.
Calibration coefficients visibility:calibration_coeffs.
None
compute_visibility.m. Consult the appendix for the implementation.
visibility in units of meters.
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