pd_plot_slice() plots a slice of data at a single point location from the
specified prism data.
prism_slice() is the deprecated version of
pd_plot_slice(pd, location) prism_slice(location, prismfile)
a vector of output from
a vector of a single location in the form of long,lat
gg object of the plot for the requested
The user should ensure the prism data comes from a continuous data set and is made up of the same temporal period. Otherwise the plot will look erratic and incorrect.