Plot multiple maps with transparency using raster data

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Qian
Qian 2024-3-21
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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回答（1 个）

Walter Roberson
Walter Roberson 2024-3-21
Ran in:
% 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])
  1 个评论
Qian
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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