Click here to see the SAS code. 
Click here to see the example. 

This is a "make believe" map that I put together to show how
sas/graph gmap might could be use to show cellphone tower coverage
of an area.  

I use maps.county (rather than maps.uscounty) because I need a map
with longitude/latitude (instead of pre-projected x/y coordinates),
so I can match them up with the long/lat coordinates of the dots
which represent cellphone towers.

I create an annotate dataset with a large orange dot for each 
cellphone tower, and also annotate an 'M' character from the
"cartog" sas/graph software font (which looks kinda like a big
pine tree, which I use to represent the special cell tower that's
across the road from sas and looks like a pine tree), and for 
the other towers I use the 'E' character (which looks like a 
tower or oil well).

I also create an annotate data set containing the outline of
each county.  The reason I do this is that I want to annotate
the county outlines, so they show up "on top of" the orange
dots, and therefore make the orange dots have the illusion
of being translucent.

I combine the annotate and map together, and "gproject" them, 
and then separate them back out again.

I use the annotate's "html" variable and put title= charttip/flyover-text,
and href= drilldowns on each tower.  Unfortunately, cingular changed the
url of their maps of the various pieces of the state coverage, and my
links don't really go anywhere now.  If I can find the new location of
cingular's links, I can update my map accordingly.

Back to Samples Index