I think having clear and accessible definitions for these terms will really help. There are multiple ways to do that, including having a “key” block that holds the definitions, or by covering this on a FAQ page, or somesuch.

I could also see a map that can show the equivalent of thermocline lines, so that you know what areas generally fall into which categories. I think that might help people quickly zoom into an area that meets the kind of environment they’re looking for.

But overall, it looks interesting!