Fix for HighLevelWCS attribute error

reproject/interpolation/tests/test_core.py

@@ -672,8 +672,9 @@ def test_broadcast_reprojection(input_extra_dims, output_shape, input_as_wcs, ou
 @pytest.mark.parametrize("input_extra_dims", (1, 2))
 @pytest.mark.parametrize("output_shape", (None, "single", "full"))
 @pytest.mark.parametrize("parallel", [True, False])
+@pytest.mark.parametrize("header_or_wcs", (lambda x: x, WCS))
 @pytest.mark.filterwarnings("ignore::astropy.wcs.wcs.FITSFixedWarning")
-def test_blocked_broadcast_reprojection(input_extra_dims, output_shape, parallel):
+def test_blocked_broadcast_reprojection(input_extra_dims, output_shape, parallel, header_or_wcs):
     image_stack, array_ref, footprint_ref, header_in, header_out = _setup_for_broadcast_test()
     # Test both single and multiple dimensions being broadcast
     if input_extra_dims == 2:
@@ -689,6 +690,9 @@ def test_blocked_broadcast_reprojection(input_extra_dims, output_shape, parallel
         # Provide the broadcast dimensions as part of the output shape
         output_shape = image_stack.shape
 
+    # test different behavior when the output projection is a WCS
+    header_out = header_or_wcs(header_out)
+
     array_broadcast, footprint_broadcast = reproject_interp(
         (image_stack, header_in), header_out, output_shape, parallel=parallel, block_size=[5, 5]
     )
@@ -701,9 +705,12 @@ def test_blocked_broadcast_reprojection(input_extra_dims, output_shape, parallel
 @pytest.mark.parametrize("block_size", [[500, 500], [500, 100], None])
 @pytest.mark.parametrize("return_footprint", [False, True])
 @pytest.mark.parametrize("existing_outputs", [False, True])
+@pytest.mark.parametrize("header_or_wcs", (lambda x: x, WCS))
 @pytest.mark.remote_data
 @pytest.mark.filterwarnings("ignore::astropy.wcs.wcs.FITSFixedWarning")
-def test_blocked_against_single(parallel, block_size, return_footprint, existing_outputs):
+def test_blocked_against_single(
+    parallel, block_size, return_footprint, existing_outputs, header_or_wcs
+):
     # Ensure when we break a reprojection down into multiple discrete blocks
     # it has the same result as if all pixels where reprejcted at once
 
@@ -727,7 +734,7 @@ def test_blocked_against_single(parallel, block_size, return_footprint, existing
 
     result_test = reproject_interp(
         hdu2,
-        hdu1.header,
+        header_or_wcs(hdu1.header),
         parallel=parallel,
         block_size=block_size,
         return_footprint=return_footprint,
@@ -737,7 +744,7 @@ def test_blocked_against_single(parallel, block_size, return_footprint, existing
 
     result_reference = reproject_interp(
         hdu2,
-        hdu1.header,
+        header_or_wcs(hdu1.header),
         parallel=False,
         block_size=None,
         return_footprint=return_footprint,

reproject/tests/test_utils.py

@@ -7,6 +7,7 @@
 
 from reproject.tests.helpers import assert_wcs_allclose
 from reproject.utils import parse_input_data, parse_input_shape, parse_output_projection
+from reproject.wcs_utils import has_celestial
 
 
 @pytest.mark.filterwarnings("ignore:unclosed file:ResourceWarning")
@@ -89,3 +90,22 @@ def test_parse_output_projection_invalid_header(simple_celestial_fits_wcs):
 def test_parse_output_projection_invalid_wcs(simple_celestial_fits_wcs):
     with pytest.raises(ValueError, match="Need to specify shape"):
         parse_output_projection(simple_celestial_fits_wcs)
+
+
+@pytest.mark.filterwarnings("ignore::astropy.utils.exceptions.AstropyUserWarning")
+@pytest.mark.filterwarnings("ignore::astropy.wcs.wcs.FITSFixedWarning")
+def test_has_celestial():
+    from .test_high_level import INPUT_HDR
+
+    hdr = fits.Header.fromstring(INPUT_HDR)
+    ww = WCS(hdr)
+    assert ww.has_celestial
+    assert has_celestial(ww)
+
+    from astropy.wcs.wcsapi import HighLevelWCSWrapper, SlicedLowLevelWCS
+
+    wwh = HighLevelWCSWrapper(SlicedLowLevelWCS(ww, Ellipsis))
+    assert has_celestial(wwh)
+
+    wwh2 = HighLevelWCSWrapper(SlicedLowLevelWCS(ww, [slice(0, 1), slice(0, 1)]))
+    assert has_celestial(wwh2)

reproject/utils.py

@@ -277,7 +277,12 @@ def reproject_single_block(a, block_info=None):
         if a.ndim == 0 or block_info is None or block_info == []:
             return np.array([a, a])
         slices = [slice(*x) for x in block_info[None]["array-location"][-wcs_out.pixel_n_dim :]]
-        wcs_out_sub = HighLevelWCSWrapper(SlicedLowLevelWCS(wcs_out, slices=slices))
+
+        if isinstance(wcs_out, BaseHighLevelWCS):
+            low_level_wcs = SlicedLowLevelWCS(wcs_out.low_level_wcs, slices=slices)
+        else:
+            low_level_wcs = SlicedLowLevelWCS(wcs_out, slices=slices)
+        wcs_out_sub = HighLevelWCSWrapper(low_level_wcs)
         if isinstance(array_in_or_path, str):
             array_in = np.memmap(array_in_or_path, dtype=float, shape=shape_in)
         else:

reproject/wcs_utils.py

@@ -8,6 +8,7 @@
 from astropy.coordinates import SkyCoord
 from astropy.wcs import WCS
 from astropy.wcs.utils import pixel_to_pixel
+from astropy.wcs.wcsapi.high_level_api import BaseHighLevelWCS
 
 __all__ = ["has_celestial", "pixel_to_pixel_with_roundtrip"]