[GrADS] Visualization Using Grib Format of ECMWF Model Result

[Characteristic]

• Visualization tools are needed to understand ECMWF model results, and this program is software designed to accomplish this purpose.

[Function]

• Convert grib data to another format
  • [Method 1] converting grib-> ctl using wgrib batch file
  • [Method 2] grib-> NetCDF conversion using ncl library
• Visualize in ctl or NetCDF format

[Materials]

• Data : Surface temperature in ECMWF model

• Period : June 2016
  [Method]

• None
  [How to]

• Same directory location for libraries required for GrADS visualization

  • xcbar.gs (Source : http://kodama.fubuki.info/wiki/wiki.cgi/GrADS/script?lang=jp)
  • worldmap (Source : ftp://cola.gmu.edu/grads/boundaries/worldmap)
  • convert grib data to ctl
  • [Method 1] converting grib-> ctl using wgrib batch file
    • [Step 1] Download grib2ctl.pl source code
    • wget "ftp://ftp.cpc.ncep.noaa.gov/wd51we/wgrib.scripts/grib2ctl.pl"
    • [Step 2] wgib.c source code download
    • wget "ftp://ftp.cpc.ncep.noaa.gov/wd51we/wgrib/wgrib.c"
    • [Step 3] Compiling with wgrib.c
    • gcc wgrib.c -o wgrib
    • [Step 4] Setting and Granting wgrib and GrADS Environment Variables
    • open grib2ctl.pl
    • $wgrib=’wgrib’
    • $wgrib=’/usr/local/bin/wgrib
    • $pdef_dir=’/usr/local/lib/grads
    • chmod 755 grib2ctl.pl
    • [Step 5] Transform ctl according to analysis site and prediction field
      • Analyst Field
        • grib2ctl.pl grib_file > grib_file.ctl
        • gribmap -i grib_file.ctl -0
      • Prediction
        • grib2ctl.pl -verf grib_file > grib_file.ctl
        • gribmap -i grib_file.ctl
  • [Method 2] grib-> NetCDF conversion using ncl library
    • ncl_convert2nc grib_file > input.nc
    • Visualization_Using_Grib_Format_of_ECMEF_Model_Result.csh)
    • Check the visualization result

[OS]

• Linux

[Language]

• GrADS
• ShellScript (csh)

[Source Code]

• Visualization Using Grib Format of ECMWF Model Result
  • https://shlee1990.tistory.com/71
• Visualization Using ASCII Format Radiation Transfer Model (RTM) Result
  • https://shlee1990.tistory.com/69
• Visualization using Medium Weather Model (WRF ARW)
  • https://shlee1990.tistory.com/67

[Result]
- Worldmap visualization required for GrADSFig. Worldmap visualization required for GrADS.

• Visualize surface temperature using ECMWF model results