Interpolating 3D objects

[dimitri-voytan]

Hi,

I am interested in extracting small 3D sub volumes from a large 3D xarray (say 100010001000 float32s) saved in netCDF format. The sub volumes may not be aligned with the "x" and "y" axes, but will be aligned with "z"

I'm wondering what the performance implications of this are since an interpolation will need to be done, in general. Reading the documentation at https://docs.xarray.dev/en/stable/user-guide/interpolation.html , it's unclear to me if the whole array needs to be loaded from disk to do this or if only a "bounding-box", aligned with the axes, around the subvolume is needed. I'm trying to avoid loading large arrays from disk so I can extract sub volumes "on-the-fly".

Thanks!