%load data
load('topo.mat','topo','topomap1');
whos topo topomap1;

% contour plot
set(gca,'XLim',[0 360],'YLim',[-90 90], ...
    'XTick',[0 60 120 180 240 300 360], ...
    'Ytick',[-90 -60 -30 0 30 60 90]);
% 2-D Image Plot
hold on
image([0 360],[-90 90],topo,'CDataMapping', 'scaled');
colormap(topomap1);
