How can I make the Earth rotate around it's axis in matlab?

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Alexandru Lapusneanu 2018-2-25

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评论： David Goodmanson 2018-3-2

So I want to represent the Earth rotating for a number of seconds from a tspan knowing that a full rotation happens in 86160 seconds. It means that for 239.33 seconds , the Earth rotates with a degree. The problem is that I don t know how to use the rotate command in a right way. This is the code:

    tspan=[0 :72000];
[X,Y,Z]=sphere(50);
R=6400000;
earth = imread('earth.jpg');
globe= surf(-X*R,Y*R,-Z*R);
image_file='earth.jpg';
cdata = imread(image_file);
set(globe, 'FaceColor', 'texturemap', 'CData', cdata,  'EdgeColor', 'none');
set(gcf,'Color','k')
set(gca, 'visible', 'off')
axis equal
view (90,0)
rotating=1; % 1 degree ever 239.33 seconds from tspan
rotate(earth, [0 1 0],1) % test to see if it's working

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采纳的回答

David Goodmanson 2018-2-25

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编辑：David Goodmanson 2018-2-26

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Hi Alexandru,

MODIFIED answer

I used a jpg of my own and reproduced your code, eliminating some lines that were not in use. It works really well. I am not sure what you mean by 'doesn't stay on fixed axis, moves around it'. When I run this, the globe stays in place. I am using [0 0 1] instead of [0 1 0] so that the globe rotates about the north pole. With [0 1 0] the globe is rotating about an unusual axis, but it is still staying in place and rotating about its center of mass.

[X,Y,Z]=sphere(50);
R=6400000;
globe= surf(-X*R,Y*R,-Z*R);
cdata = imread('chilis.jpg');
set(globe, 'FaceColor', 'texturemap', 'CData', cdata,  'EdgeColor', 'none');
set(gcf,'Color','k')
set(gca, 'visible', 'off')
axis equal
view (90,0)
rotate(earth, [0 0 1],1) % test to see if it's working

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Alexandru Lapusneanu 2018-3-2

I figured it out , after all. The code it's working, but the problem is that the axis are rescaling after the orbit is being displayed as growing from values that are close to the Earth's radius, when it's at perigee, to bigger values at apogee.