Quality control coding

In progress

Shear-probe quality-control flags

The Q (quality control) flags associated with shear-probe measurements are not compatible with the Ocean Sites Ocean Sites for quality control (QC) coding.

Every dissipation estimate from every probe must have Q flag. The numerical values of the Q flags are as follows:

      1, if FOM > FOM_limit
      2, if despike_fraction > despike_fraction_limit
      4, if |log(e_max)-log(e_min)|> diss_ratio_limit X \sigma_{\ln\varepsilon}
      8, if despike_iterations > despike_iterations_limit
      16, if variance resolved > 50% 
      32, manual flag defined by user

Flag Mask	Flag Meaning	Bit	Example threshold value
1	if FOM > FOM_limit	Bit 0	?
2	if despike_fraction > despike_fraction_limit	Bit 1	?
4	log(e_max)-log(e_min)|> diss_ratio_limit X \sigma_{\ln\varepsilon}	Bit 2	?
8	if despike_iterations > despike_iterations_limit	Bit 3	?
16	if variance resolved less than a threshold	Bit 4	50%
32	manual flag to be defined by user	Bit 5	?

The Q flags are combined by their addition. For example a Q value of 3 means that the dissipation estimated failed both FOM_limit test and the despike_fraction test. A value of 15 means that all tests failed. A failure of any one test ([math]\displaystyle{ Q\ne0 }[/math]) means that a dissipation test should not be trusted. The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2.