Fix reduce_data argument forwarding

Author: Zaczero

AUTHORS.md

@@ -112,3 +112,4 @@ The following people have made contributions to this project:
 - [Xuanhan Lai (sgxl)](https://github.com/sgxl)
 - [Nalin Parihar(Nalin7parihar](https://github.com/Nalin7parihar)
 - [Francesc Lucas Carbó (cesclc)](https://github.com/cesclc)
+- [Kamil Monicz (Zaczero)](https://github.com/Zaczero)

satpy/resample/kdtree.py

@@ -229,7 +229,8 @@ def precompute(self, mask=None, radius_of_influence=50000, epsilon=0,
                           target_geo_def=self.target_geo_def,
                           radius_of_influence=radius_of_influence,
                           neighbours=32,
-                          epsilon=epsilon)
+                          epsilon=epsilon,
+                          reduce_data=reduce_data)
 
             self.resampler = XArrayBilinearResampler(**kwargs)
             try:

satpy/tests/test_resample.py

@@ -337,6 +337,21 @@ def test_reduce_first_dim_rechunk_second_dim_good(self):
 class TestBilinearResampler(unittest.TestCase):
     """Test the bilinear resampler."""
 
+    @mock.patch("pyresample.bilinear.XArrayBilinearResampler")
+    def test_precompute_forwards_reduce_data(self, xr_resampler):
+        """Test that precompute forwards reduce_data to pyresample bilinear."""
+        from satpy.resample.kdtree import BilinearResampler
+
+        _, source_area, _, _, target_area = get_test_data()
+        resampler = BilinearResampler(source_area, target_area)
+        resampler.precompute()
+        assert xr_resampler.call_args.kwargs["reduce_data"] is True
+
+        xr_resampler.reset_mock()
+        resampler = BilinearResampler(source_area, target_area)
+        resampler.precompute(reduce_data=False)
+        assert xr_resampler.call_args.kwargs["reduce_data"] is False
+
     @mock.patch("satpy.resample.kdtree._move_existing_caches")
     @mock.patch("satpy.resample.kdtree.BilinearResampler._create_cache_filename")
     @mock.patch("pyresample.bilinear.XArrayBilinearResampler")