Table 8. Five most common keywords and their frequencies in the metadata field dc:subject.
The last row denotes the amount of files with an empty dc:subject field.
| PANGAEA | GBIF | Dryad | Zenodo | Figshare |
|---|---|---|---|---|
| water (201102) | Occurrence (6510), occurrence (46) | Temperature (16652), temperature (15916) | Taxonomy (459877), taxonomy (105) | Medicine (1057684), medicine (240) |
| DEPTH (198349), Depth(71916) | Specimen (3046), specimen (22) | Integrated Ocean Observing System (16373) | Biodiversity (458336), biodiversity (8593) | Biochemistry (1015906), biochemistry (92) |
| Spectral irradiance (175373) | Observation (2425), observation (24) | IOOS (16373) | Herbarium (270110), herbarium (91) | Biological Sciences not elsewhere classified (983829) |
| DATE/TIME (128917) | Checklist (589), checklist (43) | Oceanographic Sensor Data (15015) | Terrestrial (269900), terrestrial (177) | Chemical Sciences not elsewhere classified (842865) |
| Temperature (118522), temperature (50) | Plantas (368), plantas (42) | continental shelf (15015) | Animalia (205242), animalia (261) | Biotechnology (792223), biotechnology (23978) |
| 0 | 38296 | 15436 | 705730 | 0 |