File:Sphere with chart.png

A sphere with the chart mapping the upper hemisphere to a disk.

Created by me using Matlab.

Licensing

Public domainPublic domainfalsefalse

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. Public domainPublic domainfalsefalse

Matlab source

clf;
hold on;
colormap([0 0 1; 1 0.2 0.2; 1 0 0; 0 0 0]);

[sx,sy,sz] = sphere(49);
sc = [ ones(24,50); 2*ones(26,50) ];
surf(sx,sy,sz, sc, 'EdgeColor', 'none', 'FaceColor', 'flat', ...
     'FaceLighting', 'phong');

sz2 = 2*ones(50,50);
sc2 = 3*ones(50,50);
surf(sx,sy,sz2, sc2, 'EdgeColor', 'none', 'FaceColor', 'flat', ...
     'FaceLighting', 'phong', 'FaceAlpha', 0.5);

[cx,cy,cz] = cylinder([0.005 0.005]);
cc = 4*ones(size(cx));

surf(cx+1, cy,   2*cz, cc);
surf(cx-1, cy,   2*cz, cc);
surf(cx,   cy+1, 2*cz, cc);
surf(cx,   cy-1, 2*cz, cc);
surf(cx,   cy,   cz+1, cc);

view(3);
camlight left;
axis equal;
axis off;
print -dpng spc_tmp.png
system('convert -trim spc_tmp.png spc.png');