Table 1.
Overview of all the QC steps in the EurOBIS database, including the unique bit-sequence (2(x-1), with X = number of the QC flag) when the QC step is evaluated positively. The second last column lists whether a QC step is also available to the users through the online web services. IQR = Interquartile range; MAD = Median absolute deviation; SSS = Sea surface salinity; SST = Sea surface temperature
| QC-number | Category | Question | Bit-sequence, if answer is yes | Available as online data service | Implemented in |
|---|---|---|---|---|---|
| 2 | Taxonomy | Is the taxon name matched to WoRMS? | 2 | Yes (taxon match) | EurOBIS + OBIS |
| 3 | Taxonomy | Is the taxon level lower than family? | 4 | Yes (taxon match) | EurOBIS + OBIS |
| 4 | Geography: lat/lon | Are the latitude/longitude values different from zero? | 8 | Yes (check OBIS format) | EurOBIS + OBIS |
| 5 | Geography: lat/lon | Are the latitude/longitude values within their possible boundaries? | 16 | Yes (check OBIS format) | EurOBIS + OBIS |
| 6 | Geography: lat/lon | Are the coordinates situated in sea or along the coastline (20 km buffer)? | 32 | Yes (check OBIS format) | EurOBIS + OBIS |
| 9 | Geography: lat/lon | Are the coordinates situated in the expected geographic area (compare metadata)? | 256 | No, but visual check possible through separate data validation service | EurOBIS |
| 18 | Geography: depth | Is minimum depth ≤ maximum depth? | 131 072 | Not yet available | EurOBIS + OBIS |
| 19 | Geography: depth | Is the sampling depth possible when compared with GEBCO depth map (incl. margin)? | 262 144 | No, but depths per lat-lon can be requested through geographic web services | EurOBIS + OBIS |
| 7 | Completeness: date/time | Is the sampling year (start/end) completed and valid? | 64 | Yes (check OBIS format) | EurOBIS + OBIS |
| 11 | Completeness: date/time | Is the sampling date (year/month/day; start/end) valid? | 1 024 | Yes (check OBIS format) | EurOBIS + OBIS |
| 12 | Completeness: date/time | If a start and end date are given, is the start before the end? | 2 048 | Yes (check OBIS format) | EurOBIS + OBIS |
| 13 | Completeness: date/time | If a sampling time is given, is this valid and is the time zone completed? | 4 096 | Not yet available | EurOBIS + OBIS |
| 14 | Completeness: presence/abundance/biomass | Is the value of the field ‘ObservedIndividualCount’ empty or > 0? | 8 192 | Not yet available | EurOBIS + OBIS |
| 15 | Completeness: presence/abundance/biomass | Is the value of the field ‘Observedweight’ empty or > 0? | 16 384 | Not yet available | EurOBIS + OBIS |
| 16 | Completeness: presence/abundance/biomass | Is the field ‘SampleSize’ completed if the field ‘ObservedIndividualCount’ is > 0? | 32 768 | Not yet available | EurOBIS + OBIS |
| 1 | (Eur)OBIS data format | Are the required fields from the OBIS Schema completed? | 1 | Yes (check OBIS format) | EurOBIS + OBIS |
| 10 | (Eur)OBIS data format | Is the ‘Basis of Record' documented, and is an existing OBIS code used? | 512 | Yes (check OBIS format) | EurOBIS + OBIS |
| 17 | (Eur)OBIS data format | Is the value of the field ‘Sex’ empty or is an existing OBIS code used? | 65 536 | Not yet available | EurOBIS + OBIS |
| 21 | Outliers:environment | Is the observation within six MADs from the median depth of this taxon? | 1 048 576 | Not yet available | OBIS |
| 22 | Outliers:environment | Is the observation within three IQRs from the first & third quartile depth of this taxon? | 2 097 152 | Not yet available | OBIS |
| 23 | Outliers:environment | Is the observation within six MADs from the median SSS of this taxon? | 4 194 304 | Not yet available | OBIS |
| 24 | Outliers:environment | Is the observation within three IQRs from the first & third quartile SSS of this taxon? | 8 388 608 | Not yet available | OBIS |
| 25 | Outliers:environment | Is the observation within six MADs from the median SST of this taxon? | 16 777 216 | Not yet available | OBIS |
| 26 | Outliers:environment | Is the observation within three IQRs from the first & third quartile SST of this taxon? | 33 554 432 | Not yet available | OBIS |
| 27 | Outliers:geography | Is the observation within six MADs from the distance to the centroid of this taxon? | 67 108 864 | Not yet available | OBIS |
| 28 | Outliers:geography | Is the observation within three IQRs from the first & third quartile distance to the centroid of this taxon? | 134 217 728 | Not yet available | OBIS |
| 29 | Outliers:geography | Is the observation within six MADs from the distance to the centroid of this dataset? | 268 435 456 | Not yet available | OBIS |
| 30 | Outliers:geography | Is the observation within three IQRs from the first & third quartile distance to the centroid of this dataset? | 536 870 912 | Not yet available | OBIS |