Properties giving order of types of inputs to NDCube.crop and crop_by_values

ndcube/ndcube.py

@@ -691,6 +691,28 @@
 
         return utils.cube.get_crop_item_from_points(points, wcs, True, keepdims=keepdims)
 
+    @property
+    def crop_input_types_order(self):
+        """
+        Returns types and order of high-level coordinate objects that must be input to .crop()
+
+        Each point given to .crop() must be a tuple of scalar high-level coordinate objects
+        of these types, in this order.  Note, however, that any of these can be replaced
+        with None if cropping along the axis/axes of that world type in not desired.
+        """
+        return tuple(v[0] for v in self.wcs.world_axis_object_classes.values())
+
+    @property
+    def crop_by_values_input_units_order(self):
+        """
+        Returns units of inputs to .crop_by_values() and their required order.
+
+        Each point given to .crop_by_values() must be a tuple of scalar Quantity objects
+        with these, or equivalent units.  Note, however, that any of these can be replaced
+        with None if cropping along the axis/axes of that world type in not desired.
+        """
+        return tuple(self.wcs.world_axis_units)
+
     def __str__(self):
         return textwrap.dedent(f"""\
                 NDCube