One issue on R2014a :
Error using hg.axes/set
The name 'TickLabelInterpreter' is not an accessible property for an instance of class 'axes'.
comment out line 331 in heatmap.m:
Dang, you are right of course. In my excitement to see something that would plot geographic-coordinate vectors I failed to internalize the very clear statement that the code assumes a gridded field. Guess I'll keep looking and/or work on writing some code to do what I need.
Thanks for your prompt response. It's much appreciated.