A detailed explanation of the data quality flags used in the UOT and GTSPP is provided in the CSIRO Cookbook. Table 1 shown below is a shortened version.
Table 1. Data Quality Classes
| Class | Quality | Description |
| Flag 0 | No QC done | Flag 0 data are the level at which all data enter the working archive. They have not yet been quality controlled. |
| Flag 1 | Good data | Flag 1 data are top quality data in which no malfunctions have been identified and all real features have been verified during the quality control process. |
| Flag 2 | "Probably" good data | Flag 2 data are good data in which some features (probably real) are present but these are unconfirmed. Flag 2 data are also data in which minor malfunctions may be present but these errors are small and/or can be successfully corrected without seriously affecting the overall quality of the data. |
| Flag 3 | "Probably" bad data | Flag 3 data are suspect data in which unusual, and probably erroneous features are observed. |
| Flag 4 | Bad data | Flag 4 data are those in which obviously erroneous values are observed. |
| Flag 5 | Changed | Flag 5 data have been altered by a QC Centre, with original values (before the change) preserved in the history record of the profile. |
| Flags 6 - 8 | Reserved | Flags 6 - 8 are reserved for future use. |
| Flag 9 | QC flag missing | Flag 9 data indicate that the element is missing. |