Quality control coding: Difference between revisions
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Every dissipation estimate from every probe must have Q flag. | Every dissipation estimate from every probe must have Q flag. | ||
The numerical values of the Q flags are as follows: | The numerical values of the Q flags are as follows: | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
! Flag Mask | ! Flag Mask | ||
! Bit | |||
! Flag Meaning | ! Flag Meaning | ||
! Example threshold value | ! Example threshold value | ||
! Ex: True =1 / False =0 | ! Ex: True =1 / False =0 | ||
|- | |- | ||
| 1 | | 1 | ||
| Bit 0 | |||
| if FOM > FOM_limit | | if FOM > FOM_limit | ||
| 2 | | 2 | ||
| 0 | | 0 | ||
|- | |- | ||
| 2 | | 2 | ||
| Bit 1 | |||
| if despike_fraction > despike_fraction_limit | | if despike_fraction > despike_fraction_limit | ||
| 40% | | 40% | ||
| 0 | | 0 | ||
|- | |- | ||
| 4 | | 4 | ||
| Bit 2 | |||
| if |log(e_max)-log(e_min)|> diss_ratio_limit X \sigma_{\ln\varepsilon} | | if |log(e_max)-log(e_min)|> diss_ratio_limit X \sigma_{\ln\varepsilon} | ||
| N/A | | N/A | ||
| 1 | | 1 | ||
|- | |- | ||
| 8 | | 8 | ||
| Bit 3 | |||
| if despike_iterations > despike_iterations_limit | | if despike_iterations > despike_iterations_limit | ||
| To be confirmed | | To be confirmed | ||
| 0 | | 0 | ||
|- | |- | ||
| 16 | | 16 | ||
| Bit 4 | |||
| if variance resolved less than a threshold | | if variance resolved less than a threshold | ||
| 50% | | 50% | ||
| 1 | | 1 | ||
|- | |- | ||
| 32 | | 32 | ||
| Bit 5 | |||
| manual flag to be defined by user | | manual flag to be defined by user | ||
| N/A | | N/A | ||
| 0 | | 0 | ||
|- | |- | ||
| 64 | | 64 | ||
| Bit 6 | |||
| manual flag to be defined by user | | manual flag to be defined by user | ||
| N/A | | N/A | ||
| 0 | | 0 | ||
|- | |- | ||
| 128 | | 128 | ||
| Bit 7 | |||
| manual flag to be defined by user | | manual flag to be defined by user | ||
| N/A | | N/A | ||
| 0 | | 0 | ||
Revision as of 19:45, 3 June 2022
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:
| Flag Mask | Bit | Flag Meaning | Example threshold value | Ex: True =1 / False =0 |
|---|---|---|---|---|
| 1 | Bit 0 | if FOM > FOM_limit | 2 | 0 |
| 2 | Bit 1 | if despike_fraction > despike_fraction_limit | 40% | 0 |
| 4 | Bit 2 | log(e_max)-log(e_min)|> diss_ratio_limit X \sigma_{\ln\varepsilon} | N/A | 1 |
| 8 | Bit 3 | if despike_iterations > despike_iterations_limit | To be confirmed | 0 |
| 16 | Bit 4 | if variance resolved less than a threshold | 50% | 1 |
| 32 | Bit 5 | manual flag to be defined by user | N/A | 0 |
| 64 | Bit 6 | manual flag to be defined by user | N/A | 0 |
| 128 | Bit 7 | manual flag to be defined by user | N/A | 0 |
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.
