Get units of depth measurement from metadata. Default value is centimeters.
# S4 method for class 'SoilProfileCollection'
depth_units(object)
# S4 method for class 'SoilProfileCollection'
depth_units(object) <- value
data(sp5)
## get depth units
du <- depth_units(sp5)
# set alternate units; e.g. inches
depth_units(sp5) <- 'in'
# replace original value (cm)
depth_units(sp5) <- du