The ECHO metadata dialect includes two kinds of quality flags: QAStats and QAFlags. We examined sample granule metadata records for ~4100 collections to determine how these flags were currently used. This table shows the number of flags / record in metadata collections from sixteen DAACS. Cells that are shaded red indicate that no occurrences exist. These data indicate that four of the DAACs include a significant number of standard quality flags in their granule metadata.
| Path Elements | ASF | CDDIS | GES_DISC | GHRC | GSFCS4PA | LAADS | LANCEAMSR2 | LANCEMODIS | LARC | LARC_ASDC | LPDAAC_ECS | NSIDC_ECS | OB_DAAC | ORNL_DAAC | PODAAC | USGS_EROS |
| QAFlags/AutomaticQualityFlag | 3.45 | 0.10 | 0.32 | 2.31 | 0.81 | |||||||||||
| QAFlags/AutomaticQualityFlagExplanation | 3.45 | 0.86 | 0.32 | 2.31 | 0.81 | |||||||||||
| QAStats/QAPercentMissingData | 0.30 | 0.21 | 2.25 | 0.73 | 0.36 | |||||||||||
| QAFlags/OperationalQualityFlag | 0.30 | 0.10 | 0.82 | 0.62 | ||||||||||||
| QAFlags/OperationalQualityFlagExplanation | 0.30 | 0.10 | 0.82 | 0.62 | ||||||||||||
| QAFlags/ScienceQualityFlag | 0.30 | 0.61 | 2.28 | 0.73 | ||||||||||||
| QAFlags/ScienceQualityFlagExplanation | 0.14 | 0.06 | 2.28 | 0.73 | ||||||||||||
| QAStats/QAPercentOutOfBoundsData | 0.25 | 0.06 | 2.17 | 0.36 | ||||||||||||
| QAStats/QAPercentInterpolatedData | 0.10 | 0.01 | 2.17 | |||||||||||||
| QAStats/QAPercentCloudCover | 0.06 | 2.02 | 0.25 | 0.82 |
The most commonly occurring quality flag is the AutomaticQualityFlag and the most common values for this flag are shown below along with the % of the values they make up. There are a total of sixty-four different AutomaticQualityFlag values and the nine values that occur more than 1% of the time are included in this table.
| Value | % |
| Passed | 46.83% |
| parameter is produced correctly | 27.32% |
| Based on percentage of product that is good. Suspect used where true quality is not known. | 5.15% |
| No automatic quality assessment is performed in the PGE | 5.07% |
| DummyValue | 2.22% |
| Automatic quality determination software not yet implemented | 1.61% |
| Process Terminated Normally - Check Science Quality Flag for Science Team quality assessment | 1.43% |
| Passed indicates parameter passed for specific automatic test; Suspect, QA not run; Failed, parameter failed specific automatic test. | 1.10% |
| Validated | 1.01% |
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