ecmwf · sandorkertesz · May 1, 2026 · May 1, 2026 · May 1, 2026
diff --git a/docs/source/how-tos/grib/grib_overview.ipynb b/docs/source/how-tos/grib/grib_overview.ipynb
diff --git a/docs/source/how-tos/grib/grib_to_netcdf.ipynb b/docs/source/how-tos/grib/grib_to_netcdf.ipynb
diff --git a/docs/source/how-tos/source/data.ipynb b/docs/source/how-tos/source/data.ipynb
diff --git a/docs/source/how-tos/source/data_from_stream.ipynb b/docs/source/how-tos/source/data_from_stream.ipynb
diff --git a/docs/source/how-tos/source/file_stream.ipynb b/docs/source/how-tos/source/file_stream.ipynb
diff --git a/docs/source/how-tos/xr_engine/xarray_engine_ensemble.ipynb b/docs/source/how-tos/xr_engine/xarray_engine_ensemble.ipynb
diff --git a/docs/source/how-tos/xr_engine/xarray_engine_mono_variable.ipynb b/docs/source/how-tos/xr_engine/xarray_engine_mono_variable.ipynb
diff --git a/docs/source/how-tos/xr_engine/xarray_engine_step_ranges.ipynb b/docs/source/how-tos/xr_engine/xarray_engine_step_ranges.ipynb
diff --git a/docs/source/release-notes/version_1.0.0rc_updates.rst b/docs/source/release-notes/version_1.0.0rc_updates.rst
@@ -2,6 +2,18 @@ Version 1.0.0 Release Candidate Updates
 ///////////////////////////////////////
 
 
+Version 1.0.0rc6
+==================
+
+- Changed the earthkit grid spec attribute in the Xarray generated by the :ref:`Xarray engine <xr_engine>` from "ek_grid_spec" to "earthkit_grid_spec" (:pr:`979`).
+
+
+Version 1.0.0rc5
+==================
+
+- Ensured that the GRIB encoder sets single metadata keys with ``set()`` instead of ``set_multi()`` when there is only one metadata key to set (:pr:`977`).
+
+
 Version 1.0.0rc4
 ==================
 

diff --git a/src/earthkit/data/xr_engine/builder.py b/src/earthkit/data/xr_engine/builder.py
@@ -107,7 +107,7 @@ def build(self, add_earthkit_attrs=True):
             self._attrs["_earthkit"] = attrs
 
         if grid_spec is not None:
-            self._attrs["ek_grid_spec"] = grid_spec
+            self._attrs["earthkit_grid_spec"] = grid_spec
 
         self._attrs.update(self.fixed_local_attrs)
         data = self.data_maker(self.tensor, self.var_dims, self.name)

diff --git a/src/earthkit/data/xr_engine/engine.py b/src/earthkit/data/xr_engine/engine.py
@@ -566,8 +566,8 @@ def to_device(self, device, *, array_backend=None, array_namespace=None, **kwarg
     def grid_spec(self):
         """Return the grid specification of the DataArray."""
         try:
-            if "ek_grid_spec" in self._obj.attrs:
-                v = self._obj.attrs["ek_grid_spec"]
+            if "earthkit_grid_spec" in self._obj.attrs:
+                v = self._obj.attrs["earthkit_grid_spec"]
                 if isinstance(v, str):
                     import json
 

diff --git a/tests/xr_engine/test_xr_engine_attrs.py b/tests/xr_engine/test_xr_engine_attrs.py
@@ -257,7 +257,7 @@ def test_xr_engine_dims_as_attrs_2(allow_holes, lazy_load, idx, kwargs, coords,
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs
 
@@ -355,7 +355,7 @@ def test_xr_engine_dims_as_attrs_3(lazy_load, allow_holes, idx, kwargs, coords,
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs
 
@@ -424,7 +424,7 @@ def test_xr_engine_attrs_types(lazy_load, kwargs, coords, dims, attrs):
     compare_dims(ds, dims, sizes=True)
 
     for k, v in attrs.items():
-        if k not in ["_earthkit", "ek_grid_spec"]:
+        if k not in ["_earthkit", "earthkit_grid_spec"]:
             assert ds["t"].attrs[k] == v, f"{k}"
 
 

diff --git a/tests/xr_engine/test_xr_engine_dims.py b/tests/xr_engine/test_xr_engine_dims.py
@@ -274,7 +274,7 @@ def test_xr_ensure_dims(allow_holes, lazy_load, path, sel, kwargs, coords, dims,
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs
 
@@ -502,7 +502,7 @@ def test_xr_extra_dims(allow_holes, lazy_load, path, sel, kwargs, coords, dims,
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs
 
@@ -660,7 +660,7 @@ def test_xr_engine_level_per_type_dim(lazy_load, path, sel, kwargs, coords, dims
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v], f"Variable {v} attributes do not match expected values"
     assert ds.attrs == global_attrs
 
@@ -766,7 +766,7 @@ def test_xr_engine_dims_as_attrs_1(
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs
 
@@ -959,6 +959,6 @@ def test_xr_engine_dims_as_attrs2(lazy_load, path, sel, idx, kwargs, coords, dim
     for v in var_attrs:
         v_attrs = dict(ds[v].attrs)
         v_attrs.pop("_earthkit", None)
-        v_attrs.pop("ek_grid_spec", None)
+        v_attrs.pop("earthkit_grid_spec", None)
         assert v_attrs == var_attrs[v]
     assert ds.attrs == global_attrs