The basis of record bar groups the occurrences of a dataset in categories based on the basis of record. It allows the user to discover what kind of occurrences a dataset contains.
The occurrences are categorized based on their basis of record Enum. For each basis of record we use a distinct colour, but use similar colours for similar basis of records. We do not use the BASIS_OF_RECORD_INVALID issue, as those occurrences are assigned UNKNOWN by GBIF.
- Preserved specimens: yellow
- Fossil specimens: lighter yellow
- [Living specimens](http://gbif.github.io/gbif-api/apidocs/org/gbif/api/vocabulary/BasisOfRecord.html#LIVING SPECIMEN): lightest yellow
- Material samples: purple
- Observations: blue
- Human observations: lighter blue
- Machine observations: lightest blue
- Literature occurrences: pink
- Unknown: grey
Since unrecognized basis of records are transformed to UNKNOWN, is the issue BASIS_OF_RECORD_INVALID still useful? A search for those occurrences returns 0 results.