As a birder, I have been familiar with Big Day culture. But with iNaturalist, there are so many variables - it is a whole different field of play. Having been both a Big Day aficionado and an umpire (when part of the American Birding Association's Rules and Ethics committee), I have come up with these preliminary features for a number of Big Days and the ways to measure them.
This was my biggest day, I think, with 213 observations, on the first day of 2019's City Nature Challenge. I can do better! https://www.inaturalist.org/calendar/gyrrlfalcon/2019/4/26
So the variables for measuring a Big Day include
TOTAL Verifiable Entries
TOTAL Verifiable Entries that earn Research Grade
TOTAL Verifiable Entries with substantive comment by observer and/or identifiers
TOTAL Species seen (with differentiated rules for different taxa; specifically, those taxa where getting an entry to family or genus level is itself a triumph).
TOTAL number of the Thirteen Categories represented (see my journal entry https://www.inaturalist.org/journal/gyrrlfalcon/26417-the-thirteen-inaturalist-categories )
Big Days could maximize habitats, or seek to get the most out of one or two. I drew up this (likely incomplete) list of generalized habitat types:
- Salt water
- Fresh water
- Riparian
- Beach/Reef
- Swamp
- Grassland
- Shrubby (Chaparral)
- Mixed woodland
- Conifer forest
- Tropical forest
- Montane woods
- Montane talus
- Desert
- Agricultural
- Urban/Suburban
- Unique to your area (e.g. Karoo, kipuku)
I would think that before running the Big Day, another cool thing to do would be to check the species totals for the geographic umbrella zone (e.g. San Mateo County, Western Cape, O’ahu) to set a baseline. Adding species to the county or state list is a major accomplishment in most areas that have power users willing to undertake a Big Day, so that is a valid statistic to maintain, too.
So with these factors in play (and yes, I like such baseball statistics as Wins-above-replacement), we could construct a matrix of ways to conduct and score competitive (or self-competitive) Big Days.
I also would like to see a "Green" version wherein one seeks the highest number of entries/species with shortest distance traveled.
Anyway, I'd be interested in further thoughts.