Surface won't refit

Hi folks, I am working with topographical data to create surfaces and the surfaces end up way more complex than they need to be for what I am making. I have created some separate surfaces using different elevation maps and then I am trying to simplify them before joining them together. Rebuild works but makes the edges a mess, and FitSrf does not work- it just gives me the error- 0 surfaces refit, one surface could not be simplified. File is here

Hello - try try setting a larger tolerance on the refit.


Thanks @pascal I will try that.