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Table 1 Basic Data Usage Index indicators for primary biodiversity data published through the GBIF network
| Formula | Indicator | Description | |
|---|---|---|---|
| 1 | s(u) | Searched records | Number of records searched/viewed (by IP address) in unit |
| 2 | d(u) | Download frequency | Number of downloaded records from unit |
| 3 | r(u) | Record number | Number of records in (period; dataset(s); geographical and/or species unit) |
| 4 | S(u) | Search events | Number of different searches (by IP address) in unit |
| 5 | D(u) | Download events | Number of different downloads from unit |
| 6 | N(u) | Dataset number | Number of datasets in (period, geographical and/or species unit) |
| 7 | s(u)/S(u) | Search density | Average number of searched records per search event |
| 8 | d(u)/D(u) | Download density | Average download frequency per download event |
| 9 | d(u)/r(u) | Usage impact | Download frequency per stored record per unit |
| 10 | s(u)/r(u) | Interest impact | Searched records per stored record per unit |
| 11 | d(u)/s(u) | Usage ratio | Ratio of download frequency to searched records in unit |
| 12 | D(u)/S(u) | Usage balance | Ratio of download events to search events for unit (in %) |
| 13 | U(u)/r(u) | Usage score | Ratio of unique downloaded records (U) to record number (in %) |
| 14 | I(u)/r(u) | Interest score | Ratio of unique searched records (I) to record number (in %) |
