dft_map#

xrayvision.transform.dft_map(
input_array,
*,
u,
v,
phase_center=<Quantity [0.,
0.] arcsec>,
pixel_size=<Quantity [1.,
1.] arcsec / pix>,
)[source]#

Discrete Fourier transform in terms of coordinates returning 1-D array complex visibilities.

Parameters:

  • input_array (Quantity | NDArray) – Input array to be transformed should be 2D (m, n)

  • u (Annotated[Quantity, Unit("1 / arcsec")]) – Array of 2xN u coordinates where the visibilities are evaluated.

  • v (Annotated[Quantity, Unit("1 / arcsec")]) – Array of 2xN v coordinates where the visibilities are evaluated.

  • phase_center (Annotated[Quantity, Unit("arcsec")]) – Coordinates of the phase_center of the map e.g. (0,0) or [5.0, -2.0].

  • pixel_size (float (dx, dy), optional) – The pixel size need not be square e.g. (1, 3).

Returns:

Array of N complex visibilities evaluated at the given u, v coordinates.

Return type:

Quantity | NDArray