Hi Joe,
I can provide some guidance to your questions, and @chris may be able to add more detail.
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The Allen et al 1998 report indeed has an agricultural focus, but is the most extensive reference that we have found on Kc. It does list Kc values for trees, including in more tropical regions - e.g. category l. Tropical Fruits and Trees or category n. Fruit Trees. Many tree types have Kc values close to 1. For mixed low vegetation you could look at the ‘Forages’ category mixed with some types of bushes. Admittedly, this is not perfect, so if you do come across a better reference please let us know!
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Thanks for pointing this out, we will need to adjust the wording in the user guide.
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I suggest starting with the 500m value in the appendix that is based on the first studies we have used the model in. The 2000m is an artifact from an older version of the user guide, we need to update that. These values are not fixed, and the model may perform better with a different distance in your case study. I suggest to try different values to learn more about how the model responds in your case.
I hope this helps a bit. Your questions definitely help us clearing up some issues in the user guide.
Thanks,
Roy