In the example below, I can get a linear interpolation up to a fixed depth (30). For variable a, “1” only goes to a max depth of 25 whereas “2” goes to a max depth of 35. So for “1”, between 26 and 35 gets NA’s. Is there a way to stop interpolation based on maximum depth value? In which case, for “1” interpolation would go only to 25 and for “2” it will go to 30.

I get this error message when I try to take away a part of the intepolation with data I’m no longer using: Warning messages:
1: In type.convert.default(x) :
‘as.is’ should be specified by the caller; using TRUE