loading 3D big array

2012 5 4
2 个回答
更新时间：2025 7 3
7 次查看（30 天）

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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!

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DGM
DGM 2025-7-3
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

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回答（2 个）

Pinpress
Pinpress 2012-5-4

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im(:,:,100)??
or squeeze(im(:, 1000, :)) ??

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Ersilia Leonardis
移动：DGM 2025-7-3
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.

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Jan
Jan 2012-5-8

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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.

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Ersilia Leonardis
移动：DGM 2025-7-3
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.

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