You want to dump a specific section of a GRIB message rather than all its sections.
Step-by-step guide
You can use the "-p" option of the grib_dump command
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To find out the sections and their contents of each edition, see here:
- GRIB edition 1 sections
- GRIB edition 2 sections
For example let's look at the Grid Description Section of a GRIB 1 file. This would be Section 2 for edition 1 so we use the key "section_2":
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% grib_dump -O -p section_2 data/regular_latlon_surface.grib1
====================== SECTION_2 ( length=32, padding=0 ) ======================
1-3 section2Length = 32
4 numberOfVerticalCoordinateValues = 0
5 pvlLocation = 255
6 dataRepresentationType = 0 [Latitude/Longitude Grid (grib1/6.table) ]
7-8 Ni = 16
9-10 Nj = 31
11-13 latitudeOfFirstGridPoint = 60000
14-16 longitudeOfFirstGridPoint = 0
17 resolutionAndComponentFlags = 128 [10000000]
18-20 latitudeOfLastGridPoint = 0
21-23 longitudeOfLastGridPoint = 30000
24-25 iDirectionIncrement = 2000
26-27 jDirectionIncrement = 2000
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If a given section does not exist e.g. section 2 is optional in GRIB 2, then you get an error (Key/value not found).Note: .
The "-p" option can take one or more standard keys e.g. grib_dump -p Ni,Nj prints just those two keys and grib_dump -p pl prints the "pl" array.
Of course you can use the other grib_dump options e.g. "-j" to do a JSON dump or "-H" to see values in hex.
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This can be a very |
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efficient way of checking a set of keys without decoding others. For example if you have a very large data section, the standard grib_dump |
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would decode all its values whereas dumping a given non-data section will |
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skip decoding the data values and hence be quicker. |
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