Visibility (visibility)

Overview

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.

Input

  1. Raw sensor counts from VIS sensor, visibility_counts.

  2. Calibration coefficients visibility:calibration_coeffs.

Ancillary Requirements

None

MATLAB m-file

compute_visibility.m. Consult the appendix for the implementation.

Output

visibility in units of meters.