GMAP Procedure

Example 2: Using Traditional Map Data to Produce a Simple Block Map

Features:

MAP= required argument referring to traditional map data

DATA= required argument referring to response data

ID statement

BLOCK statement options:: BLOCKSIZE=; RELZERO

Data sets:

MAPS.ASIA (map data)

SASHELP.DEMOGRAPHICS (response data)

Sample library member:

GMPSIMPL

This example produces a block map that shows population of countries in Asia. Since the DISCRETE option is not used, the response variable is assumed to have a continuous range of values. Because neither the LEVELS= nor MIDPOINTS= option is used, the GMAP procedure selects a number of levels based on the number of map areas. It then calculates the appropriate response levels.

Simple Block Map With Traditional Map Data

Program

goptions reset=all border;

title1 "Population in Asia";

proc gmap data=sashelp.demographics(where=(cont=95))
          map=maps.asia all;
   id id;
   block pop / blocksize=1 relzero;
run;
quit;

Program Description

Set the graphics environment.

goptions reset=all border;

Define the title for the map.

title1 "Population in Asia";

Produce the block map. The ALL argument specifies that the output should include all of the map areas from the map data set, even if the response data set SASHELP.DEMOGRAPHICS does not include an observation for the map area. The ID statement specifies the variable that is in both the map data set and the response data set and defines map areas. The BLOCK statement specifies the variable in the response data set that contains the response values for each of the map areas. The BLOCKSIZE= option specifies the width of the blocks. The RELZERO option specifies that the block values are relative to zero.

proc gmap data=sashelp.demographics(where=(cont=95))
          map=maps.asia all;
   id id;
   block pop / blocksize=1 relzero;
run;
quit;