loading 3D big array

Hi everyone, does anyone know how to extract a 2D slice from a 3D binary files of size [2048]x[2048]x[1024]? I just need slices in the x-y plane for a fixed value of the third dimension, z. Thanks a lot!

[DGM]

I'm not sure what a GDA file is, and the web doesn't seem to know anymore either. I'm assuming it's a GDAL file, which would be georeferenced raster data. Seems awful deep for such an image, but maybe I'm wildly wrong.

This might be relevant, though I don't know if it would have been a solution:

https://www.mathworks.com/matlabcentral/fileexchange/6010-mexgdal

Answer 1

[Pinpress]

im(:,:,100)??

or squeeze(im(:, 1000, :)) ??

[Ersilia Leonardis]

Thanks for your reply but I haven't got my 3D image as variable in my workspace since the 3D array would be too big (file size is 16 GB!). I just wanna read off a slice from the external binary file.

Answer 2

[Jan]

The method to extract a slice from a binary file depends on the file format. It matters if you are talking about binary STL files or a simple double array stored in linear order without any header.

[Ersilia Leonardis]

The file format is gda. The data stored are just raw binary and have fortran ordering with no header. The corresponding array has size X=2048 x Y=2048 x Z=1024 and each quantity is a 4 byte real.