dev

Author: davidhassell

cf/constants.py

@@ -557,6 +557,31 @@
     },
 }
 
+# --------------------------------------------------------------------
+# CF cell methods
+# --------------------------------------------------------------------
+cell_methods = set(
+    (
+        "point",
+        "sum",
+        "maximum",
+        "maximum_absolute_value",
+        "median",
+        "mid_range",
+        "minimum",
+        "minimum_absolute_value",
+        "mean",
+        "mean_absolute_value",
+        "mean_of_upper_decile",
+        "mode",
+        "range",
+        "root_mean_square",
+        "standard_deviation",
+        "sum_of_squares",
+        "variance",
+    )
+)
+
 
 # --------------------------------------------------------------------
 # Logging level setup

cf/docstring/docstring.py

@@ -578,14 +578,17 @@
                 geographical nearest-neighbour operations such as
                 decreasing the refinement level.
 
-                For a Multi-Order Coverage (MOC), where pixels with
-                different refinement levels are stored in the same
-                array, the indexing scheme has a unique index for each
-                cell at each refinement level. The "nested_unique"
-                scheme for an MOC indexes pixels within each
-                refinement level with the nested scheme, but
-                geographically close pixels at different refinement
-                levels do not have close indices.""",
+                A Multi-Order Coverage (MOC) has pixels with different
+                refinement levels stored in the same array. The
+                "nested_unique" scheme for an MOC has a unique index
+                for each cell at each refinement level, such that
+                within each refinement level a nested-type scheme is
+                employed. In the "nested_unique" scheme, pixels at
+                different refinement levels inside a single coarser
+                refinement level cell can have widely different
+                indices. For each refinment level *n*, the
+                "nested_unique" indices are in the range
+                :math:`4^{(n+1)}, ..., 4^{(n+2)}-1`.""",
     # ----------------------------------------------------------------
     # Method description substitutions (4 levels of indentation)
     # ----------------------------------------------------------------

cf/domain.py

@@ -278,6 +278,10 @@ def create_healpix(
         Sphere. The Astrophysical Journal, 2005, 622 (2), pp.759-771.
         https://dx.doi.org/10.1086/427976
 
+        M. Reinecke and E. Hivon: Efficient data structures for masks
+        on 2D grids. A&A, 580 (2015)
+        A132. https://doi.org/10.1051/0004-6361/201526549
+
         .. versionadded:: NEXTVERSION
 
         .. seealso:: `cf.Domain.create_regular`,
@@ -339,7 +343,7 @@ def create_healpix(
             Coordinate conversion:refinement_level = 4
             Auxiliary Coordinate: healpix_index
 
-        >>> d = cf.Domain.create_healpix(8, "nested_unique", radius=6371000)
+        >>> d = cf.Domain.create_healpix(4, "nested_unique", radius=6371000)
         >>> d.dump()
         --------
         Domain: