Thanks. That’s a smart approach. I’m not sure I fancy the complexity of checking whether observations are IN or OUT of the complex shape locally though. I’ll think about how I might do that with R
I’ve just stumbled upon what might be a cleaner approach though - maybe I could register this shape as an iNaturalist ‘Place’ ? As described in another thread here: https://forum.inaturalist.org/t/geographically-limited-searches/5983/11?u=rmounce