PROC GMAP with threecolorramp style

[bstarr]

Hello,

I am trying to create a choropleth map on a three color gradient scale. I am defining the colorramp through proc template (following this guide http://support.sas.com/kb/41/776.html). I can replicate the example and change colors in the twocolorramp, but as soon as I change the style to threecolorramp, the coloring appears to revert to default. Am I missing something in the threecolorramp statement or elsewhere?

ods path(prepend) Work.Templat(update);

goptions reset=all;  
goptions gunit=pt htitle=14 htext=8 ftitle="arial" ftext="arial/bold" cback='white';

proc template;
   define style styles.colorramp;
   parent=styles.default;

   /* Define a lighter and darker shade of blue for the starting and ending colors. */
/*   style twocolorramp / startcolor=cxF3F7FE endcolor=cx6497EB;*/
 style threecolorramp / startcolor=cxFF0000 neutralcolor=cxF3F7FE endcolor=cx6497EB;

   end;
run;

ods listing style=styles.colorramp;
proc gmap data=maps.us map=maps.us;
   id state;
   choro state;
run;
quit; 

I am using SAS 9.4 TS1M6.

Thanks for any help in advance,

-Brian

[GraphGuy]

Have you seen it documented anywhere that Proc Gmap can use a 'threecolorramp' from an ODS style?

[bstarr]

Hi Dr. Allison,

I did not see documentation specifically on using threecolorramp in PROC GMAP. I only saw it for PROC TEMPLATE and just assumed that if twocolorramp works, then threecolorramp should work as well. Since I was having issues with that, I thought perhaps my assumption was misguided, which is why I turned to SAS communities 🙂 

Thanks for your help,

-Brian

[GraphGuy · Accepted solution]

Here's a way to get a 3-color color ramp, if you use Proc SGmap (instead of Proc Gmap), and if you have the latest version (found in Viya 3.5), which has support for the colormodel= option:

proc sgmap maprespdata=sashelp.us_data mapdata=mapsgfk.us;
choromap population_2010 / mapid=statecode id=statecode
   colormodel=(cxFF0000 cxF3F7FE cx6497EB);
run;

[bstarr]

Hello Dr. Allison,

Thank you for replying to my post. This looks like an excellent solution and I will work with the map more in SGMAP rather than GMAP. Unfortunately, my organization does not have Viya so I get an error when trying the colormodel= option. 

Thank you for your help on this!

-Brian