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Fix for slice width calculation #9606

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Merged
merged 2 commits into from
Jun 27, 2025
Merged

Fix for slice width calculation #9606

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f612525
Fix for slice width calculation
melanieclarke Jun 26, 2025
e870874
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melanieclarke Jun 26, 2025
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1 change: 1 addition & 0 deletions changes/9606.cube_build.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix slice width calculation for NIRSpec IFU with a new-style slice map WCS.
15 changes: 5 additions & 10 deletions jwst/cube_build/ifu_cube.py
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Expand Up @@ -2181,24 +2181,19 @@ def map_nirspec_pixel_to_sky(self, input_model, offsets):
dec3_det = np.zeros((ysize, xsize))
dec4_det = np.zeros((ysize, xsize))

pixfrac = 1.0

# determine the slice width using slice 1 and 3
slice_wcs1 = nirspec.nrs_wcs_set_input(input_model, 0)
detector2slicer = slice_wcs1.get_transform("detector", "slicer")
x, y = wcstools.grid_from_bounding_box(slice_wcs1.bounding_box)
across1, along1, _ = detector2slicer(x, y - 0.4999 * pixfrac)
across1 = across1[~np.isnan(across1)]
slice_loc1 = np.unique(across1)
mean_x, mean_y = np.mean(slice_wcs1.bounding_box[0]), np.mean(slice_wcs1.bounding_box[1])
slice_loc1, _, _ = detector2slicer(mean_x, mean_y)

slice_wcs3 = nirspec.nrs_wcs_set_input(input_model, 2)
detector2slicer = slice_wcs3.get_transform("detector", "slicer")
x, y = wcstools.grid_from_bounding_box(slice_wcs3.bounding_box)
across3, along3, _ = detector2slicer(x, y - 0.4999 * pixfrac)
across3 = across3[~np.isnan(across3)]
slice_loc3 = np.unique(across3)
mean_x, mean_y = np.mean(slice_wcs3.bounding_box[0]), np.mean(slice_wcs3.bounding_box[1])
slice_loc3, _, _ = detector2slicer(mean_x, mean_y)

across_width = abs(slice_loc1 - slice_loc3)

# for NIRSPEC each file has 30 slices
# wcs information access separately for each slice
nslices = 30
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