"Empty" profiles are used as placeholders for positions in a SoilProfileCollection
These profiles result from operations that remove or extract portions of horizons
from source profiles.
# S4 method for SoilProfileCollection
isEmpty(object, ...)logical. Vector of length equal to number of profiles in object. Returns TRUE when a profile has one horizon with NA top and bottom depths
A SoilProfileCollection
Additional arguments not used.
In a SoilProfileCollection an empty profile occurs when it has one horizon,
with NA top and bottom depths. Generally all non-profile ID site and horizon-level
values are all also NA, but only the depths are checked by isEmpty().