Don't add coordinates where we shouldn't

In the dynamic available datasets for the iasil2snd reader, don't add
coordinates to variables that don't have corresponding dimensions.

satpy/readers/iasi_l2_eps.py

@@ -28,6 +28,7 @@
 import collections
 import datetime
 import itertools
+import logging
 
 import dask.array as da
 import numpy as np
@@ -36,6 +37,8 @@
 from . import epsnative_reader
 from .file_handlers import BaseFileHandler
 
+logger = logging.getLogger(__name__)
+
 
 class EPSIASIL2FileHandler(BaseFileHandler):
     """EPS level 2 reader for IASI data.
@@ -68,6 +71,7 @@ def get_dataset(self, dataid, dataset_info):
 
     def _get_xarray_dataset(self):
         """Get full xarray dataset."""
+        logger.debug(f"Pre-loading {self.filename!s}")
         input_product = self.filename
         descriptor = epsnative_reader.assemble_descriptor("IASISND02")
         ipr_sequence = epsnative_reader.read_ipr_sequence(input_product)
@@ -83,12 +87,16 @@ def _get_xarray_dataset(self):
 
     def available_datasets(self, configured_datasets):
         """Get available datasets."""
-        common = {"file_type": "iasi_l2_eps", "resolution": 12000,
-                  "coordinates": ["lon", "lat"]}
+        common = {"file_type": "iasi_l2_eps", "resolution": 12000}
+        coords = {"y": "lon", "x": "lat"}
         if self._nc is None:
             self._nc = self._get_xarray_dataset()
         for var in self._nc.data_vars:
-            yield (True, {"name": var} | common | self._nc[var].attrs)
+            extra = {}
+            coor = [coords[x] for x in self._nc[var].dims if x in coords]
+            if coor:
+                extra["coordinates"] = coor
+            yield (True, {"name": var} | common | extra | self._nc[var].attrs)
 
 
 missing_values = {

satpy/tests/reader_tests/test_iasisnd02.py

@@ -203,7 +203,7 @@ def test_load(iasisndl2_file, tmp_path):
     with dask.config.set(scheduler=CustomScheduler(max_computes=0)):
         sc = Scene(filenames=[iasisndl2_file], reader=["iasi_l2_eps"])
         sc.load(["surface_temperature", "atmospheric_temperature",
-                 "atmospheric_water_vapour"])
+                 "atmospheric_water_vapour", "pressure_levels_temp"])
     assert sc["surface_temperature"].dims == ("y", "x")
     np.testing.assert_allclose(
             sc["surface_temperature"][0, 100:104],
@@ -226,3 +226,4 @@ def test_load(iasisndl2_file, tmp_path):
                       pyresample.SwathDefinition)
     assert sc["surface_temperature"].attrs["standard_name"] == "surface_temperature"
     assert sc["surface_temperature"].attrs["units"] == "K"
+    assert "area" not in sc["pressure_levels_temp"].attrs