Produce the surface map. CONSTANT= specifies a value that is less than the default value so the spikes are narrower at the base. NLINES= specifies the maximum number of map lines, which gives the best map shape resolution. ROTATE= and TILT= adjust the map orientation to make the crowded spikes in the northeast portion of the map easier to distinguish. 
proc gmap map=maps.us data=reflib.sites;
   id state;
   surface sites / constant=4
                   nlines=100
                   rotate=40
                   tilt=60;
run;
quit;