Yes trips would be nice, one can use this for statisticall analysis to see how fast one can find a species if one wants to (live atlas,trefkans) https://www.netwerkecologischemonitoring.nl/publicaties https://forum.inaturalist.org/t/new-paper-offers-suggestions-for-improving-the-value-of-citizen-community-science-data/5137/8 https://www.vlinderstichting.nl/actueel/nieuws/nieuwsbericht/veldinventarisaties-een-trefkansenspel
Trefkansen in USA (Occupancy rate?)
https://www.researchgate.net/publication/270103440_Niet_gezien_of_niet_aanwezig_Een_statistische_blik_op_veldwaarnemingen
acKenzie, D.I., J.D. Nichols, G.B. Lachman, S. Droege, J.A. Royle &
C.A. Langtimm, 2002. Estimating site occupancy rates when detection probabilities are less than one. Ecology 83 (8): 2248-2255.