Determines if the storm is over land or water at its observed location. This
function finds the closest grid point in the landmask
dataframe, then
checks if that grid point is over land or water.
check_over_land(tclat, tclon)
Numeric vector of the absolute value of latitude, in degrees.
Numeric vector of the absolute value of latitude, in degrees.
A logical vector of whether the storm is over land (TRUE) or water (FALSE)