Try this —
N = 250;
th1 = linspace(pi, 3*pi/2, N);
r = linspace(0, 1, N);
z = r;
x1 = r(:)*cos(th1);
y1 = r(:)*sin(th1);
z1 = r(:)*ones(1,N);
figure
surf(x1,y1,z1, 'EdgeColor','none')
axis('equal')
colormap(jet(N))
view(0,90)
xtxt = linspace(min(xlim), max(xlim), 4);
text(xtxt, ones(1,4)*max(ylim), compose('$%2d^{\\circ}$',[15 10 5 0]), 'Vert','bottom', 'Horiz','right', 'FontSize',15, 'Interpreter','latex')
Ax = gca;
Ax.Visible = 'off';
N = 250;
th2 = linspace(pi/2, 3*pi/2, N);
r = linspace(0, 1, N);
z = r;
x2 = r(:)*cos(th2);
y2 = r(:)*sin(th2);
z2 = r(:)*ones(1,N);
figure
surf(x2,y2,z2.', 'EdgeColor','none')
axis('equal')
colormap(jet(N))
view(0,90)
axis('padded')
Ax = gca;
Ax.Visible = 'off';
text(1.2*cos([3 2 1]*pi/2), 1.2*sin([3 2 1]*pi/2), [1 1 1], {'$\frac{3\pi}{2}$', '$\pi$', '$\frac{\pi}{2}$'}, 'Interpreter','latex', 'FontSize',26, 'Horiz','right', 'Vert','middle')
Make appropriate changes to get the desired result.
EDIT — Corrected typographical errors.
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