match_det2cube

jwst.cube_build.cube_internal_cal.match_det2cube(instrument, x, y, sliceno, input_model, transform, acoord, zcoord, crval_along, crval3, cdelt_along, cdelt3, naxis1, naxis2)

Match detector pixels to output plane in local IFU coordinate system.

This routine assumes:

• a 1-1 mapping in across slice to slice no, and

• the output coordinate systems is local IFU plane.

The user cannot change scaling in across slice dimension Map the corners of the x, y detector values to a cube defined by local IFU plane. In the along slice, lambda plane find the percentage area of the detector pixel which it overlaps with in the cube. For each spaxel, record the detector pixels that overlap with it - store flux, percentage overlap, and beta_distance.

Results are obtained from running C code to determine the internal coordinate system of the IFU cubes.

Parameters:

xndarray

Detector x pixel values in the slice

yndarray

Detector y pixel values in the slice

slicenoint

Slice number

input_modelIFUImageModel

Input calibrated model or file

transformobj

WCS transform to transform x, y to alpha, beta, lambda

acoordndarray

Array of along slice value defining the along slice spatial dimension of the IFU cube

zcoordndarray

Array of wavelength values defining the wavelength dimension of the IFU cube

crval_alongfloat

Along slice reference value in the IFU cube

crval3float

Wavelength reference value in the IFU cube

cdelt_alongfloat

Along slice reference value in the IFU cube

cdelt3float

Wavelength sampling in the IFU cube

naxis1int

Size of axis 1 of the IFU cube

naxis2int

Size of axis 2 of the IFU cube

Returns:

instrument_noint

Integer representing the instrument:

• 0 = MIRI

• 1 = NIRSpec

naxis1, naxis2int

Output axes of IFU cube

crval_alongfloat

Reference value in along slice dimension

cdelt_alongfloat

Sampling in along slice dimension

crval3float

Reference value in wavelength dimension

cdelt3float

Wavelength sampling

a1, a2, a3, a4float

Array of corners of pixels holding along slice coordinates

lam1, lam2, lam3, lam4float

Array of corners of pixels holding wavelength coordinates

acoordndarray

Array holding slice coordinates of the IFU internal cube

zcoordndarray

Array holding wavelength coordinates of the IFU internal cube

ssndarray

Array holding the slice number of each pixel

pixel_fluxndarray

Array of pixel fluxes

pixel_errndarray

Array of pixel errors