Date: Thu, 4 Oct 2007 13:43:34 -0400
Reply-To: Jean-Jacques Dubois <jjbdubois@MINDSPRING.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Jean-Jacques Dubois <jjbdubois@MINDSPRING.COM>
Subject: Re: Building a custom map for CHOROPLETH processing
Could you point to an example of the type of graph you are trying to produce?
Also, have you considered PROC GCONTOUR, with pattern definitions? See
output 24.3, 24.4 in the SAS/Graph docs. By carefully defining your
patterns, instead of using the defaults, you could highlight periods of high
and low use, with any ramp you choose in between. (See color ramps at
The number of intervals in your date and time ranges will determine how
'fine' or 'coarse' the blocks will be, so you might need to either
interpolate, or summarize, depending on your requirements.
For using GMAP to map non-geographic data, it is hard to beat Robert
Allison's examples at http://robslink.com/SAS/Home.htm. See the wafer maps.