Plot rotation earth in real time with MATLAB appdesigner

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Jae-Hee Park 2022-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/1724930-plot-rotation-earth-in-real-time-with-matlab-appdesigner

评论： Jonas 2022-5-27

Hi there

I want to make a app using by app designer.

when starting app with start time and end time, app shows the Earth 3D graphics and when you click the start button then 3D Earth rotating with real time.

Could you let me know what functions needed to make it or structure of the app.

thank you.

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Jonas 2022-5-25

在 MATLAB Online 中打开

if you want just a simple representation of a rotating earth, you can just use normal figure with some uiconotrol elements. taking the earth model from https://de.mathworks.com/matlabcentral/fileexchange/13823-3d-earth-example

we can rotate it in realtime, but you would not see much. i would apply a factor of 1000 to start to see something

%% Textured 3D Earth example

%

% Ryan Gray

% 8 Sep 2004

% Revised 9 March 2006, 31 Jan 2006, 16 Oct 2013

%% Options

space_color = 'k';

npanels = 180; % Number of globe panels around the equator deg/panel = 360/npanels

alpha = 1; % globe transparency level, 1 = opaque, through 0 = invisible

%GMST0 = []; % Don't set up rotatable globe (ECEF)

GMST0 = 4.89496121282306; % Set up a rotatable globe at J2000.0

% Earth texture image

% Anything imread() will handle, but needs to be a 2:1 unprojected globe

% image.

image_file = 'http://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Land_ocean_ice_2048.jpg/1024px-Land_ocean_ice_2048.jpg';

% Mean spherical earth

erad = 6371008.7714; % equatorial radius (meters)

prad = 6371008.7714; % polar radius (meters)

erot = 7.2921158553e-5; % earth rotation rate (radians/sec)

%% Create figure

figure('Color', space_color);

hold on;

% Turn off the normal axes

set(gca, 'NextPlot','add', 'Visible','off');

axis equal;

axis auto;

% Set initial view

view(0,30);

axis vis3d;

%% Create wireframe globe

% Create a 3D meshgrid of the sphere points using the ellipsoid function

[x, y, z] = ellipsoid(0, 0, 0, erad, erad, prad, npanels);

globe = surf(x, y, -z, 'FaceColor', 'none', 'EdgeColor', 0.5*[1 1 1]);

if ~isempty(GMST0)

hgx = hgtransform;

set(hgx,'Matrix', makehgtform('zrotate',GMST0));

set(globe,'Parent',hgx);

end

%% Texturemap the globe

% Load Earth image for texture map

cdata = imread(image_file);

% Set image as color data (cdata) property, and set face color to indicate

% a texturemap, which Matlab expects to be in cdata. Turn off the mesh edges.

set(globe, 'FaceColor', 'texturemap', 'CData', cdata, 'FaceAlpha', alpha, 'EdgeColor', 'none');

%%%%%%%%%%%%%%%%%%%%

% here the animation and buttons are added

speedText=uicontrol(gcf,'Style','text','String','1000','Units','normalized','Position',[0.18 0.1 0.1 0.05]);

pushbuttonMinus=uicontrol(gcf,'Style','pushbutton','String','-','Units','normalized','Position',[0.1 0.1 0.05 0.05],'Callback',@(~,~) set(speedText,'String',num2str(str2double(speedText.String)-200)));

pushbuttonPlus=uicontrol(gcf,'Style','pushbutton','String','+','Units','normalized','Position',[0.3 0.1 0.05 0.05],'Callback',@(~,~) set(speedText,'String',num2str(str2double(speedText.String)+200)));

updatesPerSecond=60;

while 1

if str2double(speedText.String)>0

degPerIteration=360/(24*60*60)/updatesPerSecond*str2double(speedText.String);

rotate(globe,[0 90],degPerIteration);

drawnow limitrate;

pause(1/updatesPerSecond);

end

Jae-Hee Park 2022-5-26

@Jonas Thank you for your great help! Base on this I will add shadow side of the Earth.

Jonas 2022-5-27

also have a look into file exchange, there are very detailed versions of earth models, e.g. earth at night, with and without clouds etc

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Plot rotation earth in real time with MATLAB appdesigner

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