gridtemplates.h File Reference

This header file contains info on all the available GRIB2 Grid Definition Templates used in Section 3 (GDS). More...

#include "grib2.h"

Go to the source code of this file.

Data Structures
struct	gridtemplate
	Struct for grid template. More...

Macros
#define	MAXGRIDMAPLEN   200
	Maximum template map length. More...
#define	MAXGRIDTEMP   31
	Maximum number of templates. More...

Variables
const struct gridtemplate	templatesgrid [MAXGRIDTEMP]
	Templates grid. More...

Detailed Description

This header file contains info on all the available GRIB2 Grid Definition Templates used in Section 3 (GDS).

Each Template has three parts:

1. The number of entries in the template (mapgridlen).
2. A map of the template (mapgrid), which contains the number of octets in which to pack each of the template values.
3. 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 3.120 as an example).

Note

Array mapgrid contains the number of octets in which the corresponding template values will be stored. A negative value in mapgrid 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 mapgrid 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 mapgrid.

Program History Log

Date	Programmer	Comments
2001-10-26	Gilbert	Initial
2007-08-16	Vuong	Added GDT 3.204 Curvilinear Orthogonal Grid
2008-07-08	Vuong	Added GDT 3.32768 Rot Lat/Lon E-grid (Arakawa)
2010-05-11	Vuong	Added GDT 3.32769 Rotate Lat/Lon Non-E Staggered grid (Arakawa)
2013-08-06	Vuong	Added GDT 3.4, 3.5, 3.12, 3.101, 3.140

Author

Stephen Gilbert

Date

2001-10-26

Definition in file gridtemplates.h.

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Data Type Documentation

gridtemplate

struct gridtemplate

Struct for grid template.

Definition at line 49 of file gridtemplates.h.

Data Fields
g2int	mapgrid[MAXGRIDMAPLEN]	Number of bytes for each template value.
g2int	mapgridlen	The number of entries in the template.
g2int	needext	Does template need extension?
g2int	template_num	Template number.

Macro Definition Documentation

MAXGRIDMAPLEN

#define MAXGRIDMAPLEN   200

Maximum template map length.

Definition at line 44 of file gridtemplates.h.

MAXGRIDTEMP

#define MAXGRIDTEMP   31

Maximum number of templates.

Definition at line 43 of file gridtemplates.h.

Variable Documentation

templatesgrid

const struct gridtemplate templatesgrid[MAXGRIDTEMP]

Templates grid.

Definition at line 1 of file gridtemplates.h.

Referenced by getgridindex(), and getgridtemplate().