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LandSciTech / ccviR

Implement NatureServe climate change vulnerability index in R
https://landscitech.github.io/ccviR/
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For NatureServe: How does SLR work? #11

Open see24 opened 3 years ago

see24 commented 3 years ago

It seems like sea level rise behaves differently for the combined index produced by the main calculator vs the combined index created by the Monte Carlo process. For the main calculator if the species is SLR vulnerable (ie F54 is TRUE) then the combined index is automatically EV. Whereas for the Monte Carlo if F54 is TRUE then the combined index is based on the first row of the combined index table, which means it behaves as if the factor D score was EV. cell F54 is also not updated based on the monte carlo so even in an iteration when the species is not SLR vulnerable it still acts like it is.

I am not sure if there is a reason for this behaviour but I think it would be good to ask the maintainers of the NatureServe calculator.

Example: image

see24 commented 2 years ago

Another issue: For species that are vulnerable to SLR and have dispersal barriers the index is automatically increased to EV but if the value for SLR is uncertain (ie more than one box was checked) the uncertainty is ignored and it is still increased to EV. This can result in the most common result from the monte carlo being less than EV but the final index being reported as EV (only when the above issue with how the MC considers the SLR is dealt with)

see24 commented 2 years ago

image