fix number of context planes (spacetelescope#1355)

Co-authored-by: Eddie Schlafly <eschlafly@gmail.com>
ddavis-stsci · Aug 13, 2024 · 8d7d7aa · 8d7d7aa
1 parent 155e8f3
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -61,6 +61,11 @@ tweakreg
 --------
 - Integration with ``SourceCatalogStep``: allow usage of results from ``SourceCatalogStep``. [#1276]
 
+resample
+--------
+
+- Fix incorrect number of starting planes for context image. [#1355]
+
 mosaic_pipeline
 ---------------
 

diff --git a/romancal/resample/resample.py b/romancal/resample/resample.py
@@ -153,8 +153,10 @@ def __init__(
  # NOTE: wait for William to fix bug in datamodels' init and then
  # use datamodels.ImageModel(shape=(nx, ny)) instead of mk_datamodel()
 
+ # n_images sets the number of context image planes.
+ # This should be 1 to start (not the default of 2).
  self.blank_output = maker_utils.mk_datamodel(
- datamodels.MosaicModel, shape=tuple(self.output_wcs.array_shape)
+ datamodels.MosaicModel, n_images=1, shape=tuple(self.output_wcs.array_shape)
  )
 
  with self.input_models: