Why is there no 'evidence of presence' chart?

you can show observations over different time intervals using various other tools. see https://forum.inaturalist.org/t/add-option-to-include-captive-observations-in-seasonality-charts/48492/4.

for example, if you wanted to see that information for observations of butterflies in the United States where evidence of presence = organism, this would be the relevant set of observations: https://www.inaturalist.org/observations?taxon_id=47224&term_id=22&term_value_id=24&place_id=1.

so using either of the tools mentioned in the first link, you could just apply the parameters taxon_id=47224&term_id=22&term_value_id=24&place_id=1, plus whichever time interval parameters you like.

you could also use your favorite scripting language to do something similar using the iNat API via /v1/observations/histogram (ex: https://forum.inaturalist.org/t/1m-observations-this-month/2582/4).

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