topic Re: Creating US Regions from states in PROC GMAP in Graphics Programming

Creating US Regions from states in PROC GMAP

That____Redhead — Thu, 29 Nov 2012 18:51:04 GMT

Hello,

I have some code I wrote to create a heat map of the US by state, but having so many states, it's not the most meaningful. So I have been trying to figure out how to combine certain states in to regions, and color just that area of the country (i.e. Northeast, southwest, etc...)

If anyone knows how to do this, I would really appreciate it! Thanks!

Re: Creating US Regions from states in PROC GMAP

GraphGuy — Thu, 29 Nov 2012 19:13:41 GMT

Do you want to just plot that subset region of the map, or do you want to show the whole map but only color the states in that subset?

Here's one way to subset a map, if that's what you're wanting...

data southeast; set maps.us (where=(statecode in ('NC' 'SC' 'GA' 'FL')));

run;

proc gmap data=southeast map=southeast;

id statecode;

choro state / discrete;

run;

Re: Creating US Regions from states in PROC GMAP

That____Redhead — Thu, 29 Nov 2012 19:33:22 GMT

Thanks Robert,

I want to have the US map with multiple states combined into a region. For example, have NC, SC, GA, FL, AL all lumped as one region.

Re: Creating US Regions from states in PROC GMAP

GraphGuy — Thu, 29 Nov 2012 19:38:46 GMT

You can assign a 'region' variable to each state, and then use 'Proc Gremove' to create a new map, with the internal borders removed.

Here is an example from the V6 SAS/Graph Examples book (using the county map, rather than the state map... but a similar technique):

http://robslink.com/SAS/democd44/ex_08.htm

http://robslink.com/SAS/democd44/ex_08_info.htm

And here is a simpler example (using maps.us) from the Tech Support website:

http://support.sas.com/kb/25/592.html