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| Info |
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When the coordinate variables for a horizontal grid are longitude and latitude, a grid mapping variable called hcrs with an grid_mapping_name attribute of value "latitude_longitude" may be used to specify the ellipsoid and prime meridian. |
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The following attributes must be included in all the variables:
| attribute name | value | comment |
|---|---|---|
| grid_mapping | hcrs | |
| _FillValue | 1.0e20 | Those attributes must be included JUST when the variable has missing values. It needs to be enforced that they are not present if they should not be there. |
| missing_value | 1.0e20 |
Conditional attributes
The following attributes may be included in the attribute list for a given variable if the conditions specified are fulfilled:
| attribute name | value | comment |
|---|---|---|
| _FillValue | 1.0e20 | Those attributes must be included JUST when the variable has missing values. It needs to be enforced that they are not present if they should not be there. |
| missing_value | 1.0e20 |
Candidate attributes
The following attributes may be included in the attribute list for a given variable at a later date:
| attribute name | value | comment |
|---|---|---|
| valid_max | TBD | see below |
| valid_min | TBD | see below |
| Info | ||
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Both "valid_min" and "valid_max" attributes should be included as variable attributes, but a set of sensible values for each and every variable needs to be provided. In the meantime, it is proposed not to include them and just bear in mind that they will be required to be introduced at some point in the future. |
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