@abbybenson I had a similar question, see here Diversifying the GBIF data model - intro - #11 by DeboraArlt, but haven’t really got a satisfying answer. When I have been thinking of absences before I have been into combing presence data set with a checklist used for the inventory, this way you can infer absences. The alternative is reporting all absences explicitely, which to me seems a waste of storage space. I am definitely interested in working with a use case.