Quality control of the underway data includes:
- Automated QC: platform identification, impossible date, impossible location, position on land, impossible speed, gloabl ranges, regional ranges, spike test, gradient, climatology, instrument comparison
- Visual control: when data failed to pass automatic checks
- Global controls: residuals from objective analysis detect anomalies
GTSPP QUALITY FLAGS CODIFICATION
|
CODE |
SIGNIFICATION |
|
0 |
NOT CONTROLLED VALUE |
|
1 |
CORRECT VALUE |
|
2 |
VALUE INCONSISTENT WITH STATISTICS |
|
3 |
DOUBTFUL VALUE (spike, ...) |
|
4 |
FALSE VALUE (out of scale, constant profile, vertical instability, ...) |
|
5 |
VALUE MODIFIED DURING QC (only for interpolate location or date) |
|
6-8 |
Not USED |
|
9 |
NO VALUE |