1. Reiner Schlitzer Alfred Wegener Institute for Polar and Marine Research Ocean Data View 4 - Data Quality Control

2. Wish: All data are of highest quality. Reality…

4. Need to quality control data.Need to quality control data. Flag dubious data. Don‘t delete data!Flag dubious data. Don‘t delete data! ODV maintains a quality flag value for every data value.ODV maintains a quality flag value for every data value. Choice between 14 quality flag schemes, including SEADATANET, ODV, ARGO and othersChoice between 14 quality flag schemes, including SEADATANET, ODV, ARGO and others

5. SEADATANET quality flag scheme Flag Description ODVGENERICQF GTSPP ARGO SEADATANET ESEAS WOD WODSTATION WOCEBOTTLE WOCECTD WOCESAMPLE QARTOD BODC PANGAEA SMHI no quality control10000005550Q*blank good value01111002223blank probably good value02221002223blank probably bad value43333433372K?? bad value84444434471K/B changed value15552005550R*| value below detection10060005550<<< value in excess10070005550>>> interpolated value10882005550T*| missing value19999439999N*B value phenomenon uncertain100A0435550Q*B QFSetID= SEADATANETQF Set Description: SEADATANET quality flags Reference: http://vocab.ndg.nerc.ac.uk/term/L201/1/

6. SEADATANET quality flag scheme Flag Description ODVGENERICQF GTSPP ARGO SEADATANET ESEAS WOD WODSTATION WOCEBOTTLE WOCECTD WOCESAMPLE QARTOD BODC PANGAEA SMHI no quality control10000005550Q*blank good value01111002223blank probably good value02221002223blank probably bad value43333433372K?? bad value84444434471K/B changed value15552005550R*| value below detection10060005550<<< value in excess10070005550>>> interpolated value10882005550T*| missing value19999439999N*B value phenomenon uncertain100A0435550Q*B QFSetID= SEADATANETQF Set Description: SEADATANET quality flags Reference: http://vocab.ndg.nerc.ac.uk/term/L201/1/

7. Purpose: Once QC is performed the quality flags can be used to filter the data by quality.

8. Data Editing and Quality Control easy spotting and identification of outliers or offsets easy spotting and identification of outliers or offsets painless editing of data value and quality flag painless editing of data value and quality flag logging of all value or flag modifications logging of all value or flag modifications automatic range checks and manual or automatic editing automatic range checks and manual or automatic editing

9. Manual Data Editing and Quality Control

10. Automatic Range Checks and Outlier Removal

11. Note: All changes logged in.log file.All changes logged in.log file. Can be viewed Collection>View Log fileCan be viewed Collection>View Log file