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solves #726: bug in default inverse mapping #727

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solves #726: bug in default inverse mapping #727

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4 changes: 2 additions & 2 deletions gwcs/wcs/_wcs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2787,14 +2787,14 @@ def _calc_approx_inv(self, max_inv_pix_error=5, inv_degree=None, npoints=16):
if isinstance(transform, projections.Projection):
sky2pix_proj = transform
break
if sky2pix_proj.__name__.startswith("Pix2Sky"):
if type(sky2pix_proj).__name__.startswith("Pix2Sky"):
sky2pix_proj = sky2pix_proj.inverse
lon_pole = _compute_lon_pole((crval1, crval2), sky2pix_proj)
ntransform = (
(Shift(crpix[0]) & Shift(crpix[1]))
| self.forward_transform
| RotateCelestial2Native(crval1, crval2, lon_pole)
| sky2pix_proj()
| sky2pix_proj
)

# standard sampling:
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