Plot multiple maps with transparency using raster data

Question

Qian 2024-3-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2097516-plot-multiple-maps-with-transparency-using-raster-data

评论： Qian 2024-3-21

I have a three-Dimension dataset var_slice, the first and second dimensions are latitude and longitude, the third is time. I want to plot all the images for all times together by setting the transparency. So I can get a final figure in which regions have multiple occurence have darker color. How can I overlay all the images? I put the code to plot the map for a singe time below and attached the data. Any help would be appreciated.

  % load the 3-D data
    load var_slice.mat 
    load lat.mat
    load lon.mat
    
    % plot
    pcolor(lon,lat,var_slice(:,:,1))
    shading interp;
    hold on
    borders('continental us','color','k','linestyle','-','linewidth',1.2)
    % axis tight
    hold off
    ylim([25,50])
    xlim([-130,-95])

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Answer 1

Walter Roberson 2024-3-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2097516-plot-multiple-maps-with-transparency-using-raster-data#answer_1429256

在 MATLAB Online 中打开

% load the 3-D data

load var_slice.mat

load lat.mat

load lon.mat

% plot

for K = 1 : size(var_slice,3)

s = pcolor(lon,lat,var_slice(:,:,1));

s.FaceAlpha = 0.05;

s.EdgeColor = 'none';

hold on

end

%shading interp;

borders('continental us','color','k','linestyle','-','linewidth',1.2)

Unrecognized function or variable 'borders'.

% axis tight

hold off

ylim([25,50])

xlim([-130,-95])

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Qian 2024-3-21

Thank you so much for your help. In the for loop the index should be K: s = pcolor(lon,lat,var_slice(:,:,K)). It works! The borders can be added using https://www.mathworks.com/matlabcentral/fileexchange/50390-borders. Thanks again.

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