Grib1 To Grib2 Converter Weight

Climate Prediction Center - wgrib2: converting MERRA HDF file to grib2 Search CPC Search About Us Contact Us > > > > wgrib2 - example converting MERRA HDF to grib2 wgrib2: Converting MERRA HDF file to GRIB-2 Introduction MERRA is a NASA reanalysis project that has created reanalyses in HDF format. For some people, grib is a more convenient format. Here is our first attempt to convert a MERRA HDF file into grib-2. Surveying the situation we see that Lats or the simpler to use Lats4d can convert HDF into grib-1. Grib-1 can be converted into grib-2 by the cnvgrib utility except that lats creates a custom grib table. Therefore a program would have to be written that converts the grib-1 file with the custom grib table into a grib table using the standard NCEP table.

>From: McIDAS Help Desk >Organization: UCAR/Unidata >Keywords: 49.k17Jnd7s001693 NOAAPORT GRIB2 GRIB1 converter Hi again Barry, >re: >>At last week's CONDUIT-CRAFT meeting, you said that I could contact you >>to find out where to obtain GRIB2-->GRIB1 converters. >> >>When you get a chance, please let me know where to find them.

Doable but the program wouldn't be very generic. In addition the process would take 3 steps (convert to grib1, translate grib1, convert to grib2). Can we do better? Looking at the programs that can read HDF, we see a familiar face, GrADS. GrADS can read the HDF and write it out as a binary file.

Wgrib2 can then read the binary file, a grib-2 template and metadata and then create a grib-2 file. 1: The template Grib-2 files include much metadata that is constant such as grid, center that created the data, the process that created the data, etc. Making a template takes some knowledge and we'll assume it has already been done. For the MERRA template, I used copygb/cnvgrib to create a grib2 file with the proper grid definition and then used wgrib2 to fill in some of the metadata (center). Probably should have filled in more of the metadata but I didn't. 2: Writing the binary and meta data The script g2write takes three arguements, the GrADS variable/expression, the output file and some metadata (variable:level:forecast/analysis). The script then creates the binary and metadata for one or more grids depending whether t is varying.

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These two files along with the template can be used to make a grib2 file. 3: All together • Start gradshdf. • open the HDF file, sdfopen hdf-file • run the script, merra2grb2.gs 4: What does merra2grb2 do? • set the grid. Grads often uses an extra column.