Introduction

Please see new grib for the basic concepts of making new grib files.

The -set option changes specific metadata of the in-memory grib (sub-)message. Expect the list of supported fields to expand as needed. At present, the -set option only changes fields within the grib file. There is some overlap between various -set_* options and the -set option. (Ex. -set_center N, and -set center N.) The -set option is the newer method.

Parameters that can be set

The available parameters that can be set will depend on the version of wgrib2 being used. To see the parameter available,

$ wgrib2 grib_file -set junk junk
*** FATAL ERROR: set: allowed values: discipline, center, subcenter, master_table, local_table, 
background_process_id, analysis_or_forecast_process_id, model_version_date, chemical, table_1.2, 
table_1.3, table_1.4, table_3.0, table_3.1/GDT, table_3.2, table_3.3, table_3.4, table_4.0/PDT, 
table_4.1, table_4.2, table_4.3, table_4.5a, table_4.5b, table_4.6, table_4.7, table_4.8, 
table_4.10, table_4.11, table_4.230, table_5.0/DRT, table_6.0, % ***

Usage

-set X Y             X=field, Y=integer/float/long long int
                     depending on X

                     To find the values of X, use: wgrib2 - -set help all

Fields (as of wgrib2 v2.0.1)

1. discipline or table_0.0 (fixed v2.0.5)
2. center
3. subcenter
4. master_table or table_1.0
5. local_table or table_1.1
6. background_process_id
7. analysis_or_forecast_process_id
8. model_version_date
9. table_1.2
10. table_1.3
11. table_1.4
12. table_3.0
13. table_3.1 or GDT
14. table_3.3
15. table_3.4
16. table_4.0 or PDT
17. table_4.1
18. table_4.2
19. table_4.3
20. table_4.6
21. table_4.10
22. table_4.11
23. table_5.0 or DRT
24. table_6.0

Fields (as of wgrib2 v2.0.8)

1. most are obvious and take an integer argument
2. %: integer 0..100, percentage forecast
3. model_version_date: YYYYMMDDHHmmss, for PDT 4.60 and 4.61

Example

$ wgrib2 -set center 99 -center
1:0:center=De Bilt, Netherlands
2:46042:center=De Bilt, Netherlands
3:63079:center=De Bilt, Netherlands
4.1:86046:center=De Bilt, Netherlands
...

See also: -fi, -grib, -grib_out, -if -set_metadata