Incorrect values might be displayed in the data tips on graphs generated with some SAS/GRAPH map data sets. The problem will occur when using "ALT=" in the value of the variable specified in the HTML= option on the CHORO statement in PROC GMAP to provide more information about the map area, and the map contains trailing missing values for the map area.

To circumvent the problem, edit the map data set to remove the trailing missing values. For example:

   
data uscounty;
   set maps.uscounty;
   by state county;
   if last.county and x=. then delete;
run;

New map data sets will be available for download from the Mapsonline website during the second quarter of 2008 that do not exhibit this problem.

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