8000 move important rule (about the use of [over _type2_] outside the exam… by TomLav · Pull Request #598 · cf-convention/cf-conventions · GitHub
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move important rule (about the use of [over _type2_] outside the exam… #598

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move important rule (about the use of [over _type2_] outside the exam… #598

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4 changes: 3 additions & 1 deletion ch07.adoc
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Expand Up @@ -431,6 +431,7 @@ These name(s) must be a subset of the standardised **`area_type`** strings.
This convention can accommodate cases in which a method is applied to more than one area type and the result is stored in a single data variable (with a dimension which ranges across the various area types).
It provides a convenient way to store output from land surface models, for example, since they deal with many area types within each surface gridbox (e.g., **`vegetation`**, **`bare_ground`**, **`snow`**, etc.).


[[mean-surface-temperature-sensible-heat-flux]]
[caption="Example 7.7. "]
.Mean surface temperature over land and sensible heat flux averaged separately over land and sea.
Expand All @@ -452,14 +453,15 @@ variables:
data:
land_sea="land","sea";
----
====

If the _method_ is `mean`, various ways of calculating the mean can be distinguished in the `cell_methods` attribute with a string of the form "mean where _type1_ [over _type2_]".
Here, _type1_ can be any of the possibilities allowed for _typevar_ or _type_ (as specified in the two paragraphs preceding above Example).
The same options apply to _type2_, except it is not allowed to be the name of an auxiliary coordinate variable with a dimension greater than one (ignoring the possible dimension accommodating the maximum string length).
A `cell_methods` attribute with a string of the form "mean where _type1_ over _type2_" indicates the mean is calculated by summing over the _type1_ portion of the cell and dividing by the area of the _type2_ portion.
In particular, a `cell_methods` string of the form "mean where all_area_types over _type2_" indicates the mean is calculated by summing over all types of area within the cell and dividing by the area of the _type2_ portion.
(Note that `all_area_types` is one of the valid strings permitted for a variable with the `standard_name` `area_type`.)
If "over _type2_" is omitted, the mean is calculated by summing over the _type1_ portion of the cell and dividing by the area of this portion.
====

[[thickness-over-sea-area-ex]]
[caption="Example 7.8. "]
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