extract_mid

ska_sdp_func_python.fourier_transforms.fft_support.extract_mid(a, npixel)

Extract a section from middle of a map.

Suitable for zero frequencies at npixel/2. This is the reverse operation to pad.

Note

Only the two innermost axes are transformed.

Parameters:

• a – grid from which to extract

• npixel – desired size of the section to extract

Returns:

Section of grid