%%
% Maps the density of the power dissipation index, which is the cube of the
% storm maximum wind speed integrated over that portion of the track within
% each lat-long box whose dimensions are specified in _params.m_. The units
% are $10^3 m^2/s^2$ per degree latitude squared.  Other map characteristics
% can be specified in _params.m_ .
%
% This version of the script uses MATLAB's mapping toolbox. Various map
% properties can be set in _params.m_ .