Plotting on a world map with Matlab

%Initialize the map
load coast;
worldmap('world');
set(gcf,'color','white');
plotm(lat,long, 'k-');

%Plot data
surfm(Lat, Lon, data);
colorbar('horiz');

%set colorbar limits
set(gca, 'CLim',[min(data(~isnan(data))) 
max(data(~isnan(data)))]);
title('20080601');