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pdstemplates.h(3) NCEPLIBS-g2c pdstemplates.h(3)

NAME

pdstemplates.h - This inculde file contains info on all the available GRIB2 Product Definition Templates used in Section 4 (PDS).

SYNOPSIS

#include 'grib2.h'

Data Structures


struct pdstemplate
Struct for PDS template.

Macros


#define MAXPDSMAPLEN 200
maximum template map length #define MAXPDSTEMP 47
maximum number of templates

Variables


const struct pdstemplate templatespds [MAXPDSTEMP]
Date for struct for PDS template.

Detailed Description

This inculde file contains info on all the available GRIB2 Product Definition Templates used in Section 4 (PDS).

The information decribing each template is stored in the pdstemplate structure defined below.

Each Template has three parts: The number of entries in the template (mappdslen); A map of the template (mappds), which contains the number of octets in which to pack each of the template values; and a logical value (needext) that indicates whether the Template needs to be extended. In some cases the number of entries in a template can vary depending upon values specified in the 'static' part of the template. ( See Template 4.3 as an example )

Note

Array mappds contains the number of octets in which the corresponding template values will be stored. A negative value in mappds is used to indicate that the corresponding template entry can contain negative values. This information is used later when packing (or unpacking) the template data values. Negative data values in GRIB are stored with the left most bit set to one, and a negative number of octets value in mappds[] indicates that this possibility should be considered. The number of octets used to store the data value in this case would be the absolute value of the negative value in mappds[].

PROGRAM HISTORY LOG:

  • 2005-12-08 Gilbert Allow negative scale factors and limits for Templates 4.5 and 4.9
  • 2009-12-15 Vuong Added Product Definition Template 4.31 Added Product Definition Template 4.15
  • 2010-08-03 Vuong Added Product Definition Template 4.40,4.41,4.42,4.43
  • 2010-12-08 Vuong Corrected Definition Template 4.42,4.43
  • 2010-12-08 Vuong Corrected Definition Template 4.42,4.43
  • 2012-03-29 Vuong Added Templates 4.44,4.45,4.46,4.47,4.48,4.50, 4.51,4.91,4.32 and 4.52
  • 2013-08-05 Vuong Corrected 4.91 and added Templates 4.33,4.34,4.53,4.54
  • 2015-10-07 Vuong Added Templates 4.57, 4.60, 4.61 and allow a forecast time to be negative

Author

Stephen Gilbert

Date

2005-12-08

Definition in file pdstemplates.h.

Data Type Documentation

struct pdstemplate

Struct for PDS template.

Definition at line 55 of file pdstemplates.h.

Data Fields:

g2int mappds[MAXPDSMAPLEN]

g2int mappdslen

g2int needext

g2int template_num

Macro Definition Documentation

#define MAXPDSMAPLEN 200

maximum template map length

Definition at line 50 of file pdstemplates.h.

#define MAXPDSTEMP 47

maximum number of templates

Definition at line 49 of file pdstemplates.h.

Variable Documentation

const struct pdstemplate templatespds[MAXPDSTEMP]

Date for struct for PDS template.

Definition at line 1 of file pdstemplates.h.

Referenced by getpdsindex(), and getpdstemplate().

Author

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Tue May 3 2022 Version 1.6.4