In GRIB edition 2 what are these Product Definition Templates?
The purpose of the Product Definition section is to describe the nature of the data contained in the Data section.The Product Definition section has a number to signify the different templates. This is called the Product Definition Template Number or PDTN for short. The ecCodes key for this is productDefinitionTemplateNumber.
Note that there are three categories of GRIB2 templates – Grid Definition Templates, Product Definition Templates , and Data Representation Templates. They are identified by the Grid Definition Template Number, Product Definition Template Number, and Data Representation Template Number, respectively.
Here we describe the Product Definition Templates only. The ecCodes key for its template number is "productDefinitionTemplateNumber".
The Product Definition Templates are normally divided into groups of 4. For example the most commonly used ones are:
| Deterministic | Ensemble | |
|---|---|---|
| Instantaneous | 0 | 1 |
| Interval-based | 8 | 11 |
So we have two dimensions:
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For meaning of codes, see http://apps.ecmwf.int/codes/grib/format/grib2/templates/4/
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