Add require statement
Modify argument names
Add require statements
Modify object names
Modify object names
Open conditional block for case where lon/lat provided
Get matrix of longitude and latitude for source location
Determine the UTM zone
Determine whether source is in the NH or SH
Define PROJ.4 projection string for lat/lon projection
Define PROJ.4 projection string for UTM projection
Project as UTM coords from determined UTM zone
Define the UTM x coordinates in km units
Define the UTM y coordinates in km units