Generate the regional map. The ID statement specifies the variable that defines the map areas and is in both the map data set and the response data set. DISCRETE specifies that each value of the numeric response variable, STATE, be treated as a separate response level. HTML= specifies REGIONDRILL as the variable that contains the targets for the map regions. Specifying HTML variables causes SAS/GRAPH to add an image map to the HTML body file. DES= specifies the description that is stored in the catalog and used in the Table of Contents. NAME= specifies the name of the graphics catalog entry. Because the PATH= destination is a file storage location and not a specific file name, the catalog entry name EPAMAP is automatically assigned to the GIF file. 
proc gmap map=maps.us data=newsites;
   id state;
   choro region / discrete
                  html=regiondrill
                  coutline=black
                  nolegend
                  des='EPA Regional Map'
                  name='epamap';
run;
quit;