Project map onto a plane centered in the Pacific. PROJECT= specifies the projection method for the map data set. POLELONG= and POLELAT= specify a projection pole for the gnomonic projection. In this example, the pole is positioned in the Pacific Ocean. 
proc gproject data=reflib.us48
              out=reflib.skew
              project=gnomon
              polelong=160
              polelat=45;
   id state;
run;