Quality control coding: Difference between revisions
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'''[In progress] | |||
''' | |||
'''Shear-probe quality-control flags''' | |||
The Q (quality control) flags associated with shear-probe measurements are bitwise flags with boolean values which are CF compliant. More information available here: https://mplnet.gsfc.nasa.gov/about-flags | |||
{| class=wikitable | Every dissipation estimate from every probe must have Q flag. | ||
The numerical values of the Q flags are as follows: | |||
{| class="wikitable" | |||
|- | |||
! Flag Mask | |||
! Bit | |||
! Flag Meaning | |||
! Example threshold value | |||
| Ex: True =1 / False =0 | |||
| Ex: Q value | |||
|- | |||
| 1 | |||
| Bit 0 | |||
| Poor figure of merit | |||
| 1.15 | |||
| 0 | |||
| 0 | |||
|- | |||
| 2 | |||
| Bit 1 | |||
| Large fraction of data with spikes | |||
| 5% | |||
| 0 | |||
| 0 | |||
|- | |||
| 4 | |||
| Bit 2 | |||
| Anomalously large disagreement between dissipation estimates from probes | |||
| 2.772 | |||
| 1 | |||
| 4 | |||
|- | |||
| 8 | |||
| Bit 3 | |||
| Too many iterations of despiking routine | |||
| 8 | |||
| 0 | |||
| 0 | |||
|- | |||
| 16 | |||
| Bit 4 | |||
| Insufficient variance resolved | |||
| 50% | |||
| 1 | |||
| 16 | |||
|- | |- | ||
| 32 | |||
| Bit 5 | |||
| manual flag to be defined by user | |||
| N/A | |||
| 0 | |||
| 0 | |||
|- | |- | ||
| | | 64 | ||
| | | Bit 6 | ||
| | | manual flag to be defined by user | ||
| N/A | |||
| 0 | |||
| 0 | |||
|- | |- | ||
| | | 128 | ||
| | | Bit 7 | ||
| | | manual flag to be defined by user | ||
| | | N/A | ||
| 0 | |||
| 0 | |||
| | |- | ||
| | | | ||
| | |||
| | | | ||
| | | | ||
| | | | ||
| | | Final Q = 20 | ||
| | |||
| | |||
|} | |} | ||
<br /> | <br /> | ||
The Q flags are combined by their addition. | |||
For example a Q value of 20 means that the dissipation estimated failed both dissipation ratio limit test and the resolved variance test. | |||
A value of 255 means that all tests failed. | |||
The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2. | |||
----------------------------- | |||
return to [[Flow chart for shear probes]] | |||
[[Category: Shear probes]] |
Latest revision as of 09:18, 28 August 2023
[In progress]
Shear-probe quality-control flags
The Q (quality control) flags associated with shear-probe measurements are bitwise flags with boolean values which are CF compliant. More information available here: https://mplnet.gsfc.nasa.gov/about-flags
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 | Ex: Q value |
---|---|---|---|---|---|
1 | Bit 0 | Poor figure of merit | 1.15 | 0 | 0 |
2 | Bit 1 | Large fraction of data with spikes | 5% | 0 | 0 |
4 | Bit 2 | Anomalously large disagreement between dissipation estimates from probes | 2.772 | 1 | 4 |
8 | Bit 3 | Too many iterations of despiking routine | 8 | 0 | 0 |
16 | Bit 4 | Insufficient variance resolved | 50% | 1 | 16 |
32 | Bit 5 | manual flag to be defined by user | N/A | 0 | 0 |
64 | Bit 6 | manual flag to be defined by user | N/A | 0 | 0 |
128 | Bit 7 | manual flag to be defined by user | N/A | 0 | 0 |
Final Q = 20 |
The Q flags are combined by their addition. For example a Q value of 20 means that the dissipation estimated failed both dissipation ratio limit test and the resolved variance test. A value of 255 means that all tests failed. The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2.
return to Flow chart for shear probes