How to reduce the grid size of 3D matrix, (quarter of its original size)

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I have grid data, (X,Y,T) x=lon,y=lat,t=time. The size of the data is (281*321*60), which is 0.25*0.25 grid data. I want to make it 1*1 grid. The final result should be (71*72*60). Kindly help me to do this. I know, how to interpolate and increase the resolution, but no idea how to reduce the resolution and increase the grid size. Thank you.

Accepted Answer

Simon Chan
Simon Chan on 27 Jul 2021
Suppose A is your data where size is (281*321*60), try the following:
[Ny,Nx,~] = size(A);
idx1 = 1:4:Ny;
idx2 = 1:4:Nx;
B = A(idx1,idx2,:);
Noticed that the size of the result, B is (71*81*60)
size(B)
71 81 60

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