GFS - Revision history

Francisco at 10:49, 29 February 2012

2012-02-29T10:49:03Z

2012-02-29T10:08:32Z

‎ASCII to HDF5 format

2012-02-29T10:07:58Z

2012-02-28T15:27:06Z

‎wgrib2.exe

2012-02-28T15:26:39Z

‎wgrib2.exe

2012-02-28T15:21:45Z

‎wgrib2.exe

2012-02-28T13:37:12Z

‎wgrib.exe

2012-02-28T13:15:26Z

‎wgrib.exe

2009-09-28T21:56:54Z

‎wgrib.exe

2009-09-28T21:52:59Z

‎ASCII to HDF5 format

← Older revision		Revision as of 10:49, 29 February 2012
Line 1:		Line 1:
−	This article is about [[GFS]] data conversion.	+	This article is about [[GFS]] data conversion, data can be accessed from http://nomads.ncep.noaa.gov/.

	The Global Forecasting System (GFS) files are packed under the GRIB protocol, following the World Meteorological Organization (WMO) protocol and is the primary format at the operational centers (ECMWF,NCEP). There are two different types of GRIB files: '''GRIB1''' and '''GRIB2.''' GRIB2 is the most recent format, because of that historical simulation files (e.g. reanalysis) are usually found in GRIB1 while the forecasts and recent analysis files are in GRIB2 format.		The Global Forecasting System (GFS) files are packed under the GRIB protocol, following the World Meteorological Organization (WMO) protocol and is the primary format at the operational centers (ECMWF,NCEP). There are two different types of GRIB files: '''GRIB1''' and '''GRIB2.''' GRIB2 is the most recent format, because of that historical simulation files (e.g. reanalysis) are usually found in GRIB1 while the forecasts and recent analysis files are in GRIB2 format.

@@ Line 60: / Line 60: @@
 ==ASCII to HDF5 format==
-Once obtained, the ASCII results outcoming from the wrib2.exe have to be converted into HDF5 to serve as input for the Mohid atmosphere module. This operation is performed through a Matlab code available in:
+Once obtained, the ASCII results outcoming from the wgrib2.exe have to be converted into HDF5 to serve as input for the Mohid atmosphere module. This operation is performed through a Matlab code available in:
 \\einstein\www\ftp.mohid.com\operational\meteoIST\GFSGRIB2\Matlab

← Older revision		Revision as of 10:07, 29 February 2012
Line 1:		Line 1:
−	This article is about [[GFS]] ~~and is under construction~~	+	This article is about [[GFS]] data conversion.

	The Global Forecasting System (GFS) files are packed under the GRIB protocol, following the World Meteorological Organization (WMO) protocol and is the primary format at the operational centers (ECMWF,NCEP). There are two different types of GRIB files: '''GRIB1''' and '''GRIB2.''' GRIB2 is the most recent format, because of that historical simulation files (e.g. reanalysis) are usually found in GRIB1 while the forecasts and recent analysis files are in GRIB2 format.		The Global Forecasting System (GFS) files are packed under the GRIB protocol, following the World Meteorological Organization (WMO) protocol and is the primary format at the operational centers (ECMWF,NCEP). There are two different types of GRIB files: '''GRIB1''' and '''GRIB2.''' GRIB2 is the most recent format, because of that historical simulation files (e.g. reanalysis) are usually found in GRIB1 while the forecasts and recent analysis files are in GRIB2 format.

@@ Line 38: / Line 38: @@
 ===wgrib2.exe===
-The wgrib2.exe is a command-line program and presents a wide list of options. The best option is to convert the grib2 file into a netcdf file and using [[ConvertToHDF5#Generic_NETCDF_CF_FILES| ConvertToHDF5 Generic_NETCDF_CF_FILES]]
+The wgrib2.exe is a command-line program and presents a wide list of options. The best option is to convert the grib2 file into a netcdf file using [[ConvertToHDF5#Generic_NETCDF_CF_FILES| ConvertToHDF5 Generic_NETCDF_CF_FILES]]
 Also can be obtained an ascii file and in order to reduce the computing space, the extracted domain can be limited through the option -small_grib. A typical command-line using this option would be:

@@ Line 38: / Line 38: @@
 ===wgrib2.exe===
-The wgrib2.exe is a command-line program and presents a wide list of options. In order to reduce the computing space, the extracted domain can be limited through the option -small_grib. A typical command-line using this option would be:
+The wgrib2.exe is a command-line program and presents a wide list of options. The best option is to convert the grib2 file into a netcdf file and using [[ConvertToHDF5#Generic_NETCDF_CF_FILES| ConvertToHDF5 Generic_NETCDF_CF_FILES]]
   wgrib2 20090101/gfs.t00z.pgrb2f00 -small_grib -10:11 30:45 Smallergrib00.grib
@@ Line 55: / Line 57: @@
 *U - U-Component of Wind 10 m above ground [m/s]
 *V - V-Component of Wind 10 m above ground [m/s]
 ==ASCII to HDF5 format==

← Older revision		Revision as of 13:37, 28 February 2012
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	wgrib -s grib_file \| grep "variable_name" \| wgrib -s -i -text grib_file -o output_file.dat		wgrib -s grib_file \| grep "variable_name" \| wgrib -s -i -text grib_file -o output_file.dat
		+
		+	To obtain the grid
		+
		+	wgrib -V -o /dev/null -d 1 grib_file

	===wgrib2.exe===		===wgrib2.exe===

@@ Line 18: / Line 18: @@
 ===wgrib.exe===
-Before using the wgrib.exe it would be needed the additional software grep, that can be downloaded from:
+Before using the wgrib.exe (in this case the Windows version) it would be needed the additional software grep, that can be downloaded from:
 http://gnuwin32.sourceforge.net/packages/grep.htm
 Once installed it is needed to include a path to the variables in order to be recognised the grep command. The path is set in Control panel -> System -> Advanced -> Environmental variables -> Path then adding a line at the end with the location of the software i.e. C:\Program Files (x86)\GnuWin32\bin
 ===wgrib2.exe===

@@ Line 47: / Line 47: @@
 ==ASCII to HDF5 format==
-Once obtained, the ASCII results outcoming from the wrib have to be converted into HDF5 to serve as input for the Mohid atmosphere module. This operation is performed through a Matlab code found in:
+Once obtained, the ASCII results outcoming from the wrib2.exe have to be converted into HDF5 to serve as input for the Mohid atmosphere module. This operation is performed through a Matlab code available in:
 \\einstein\www\ftp.mohid.com\operational\meteoIST\GFSGRIB2\Matlab
-The Matlab version for using this code have to be the R2008b version or previous due to the uncompatibility found with new versions (i.e. R2009a) with the HDF5 libraries version. The new versions work with HDF5 libraries 1.8.1 while the previous work with 1.6.5 libraries that are compatible with the rest of the Mohid modelling system.
+The Matlab version for using this code have to be the R2008b version, or previous, due to the uncompatibility found with new versions (i.e. R2009a) with the HDF5 libraries version. The new Matlab versions work with the 1.8.1 HDF5 libraries version while the previous Matlab versions work with 1.6.5 HDF5 libraries. All the Mohid modelling system is compatible with 1.6.5 HDF5 libraries.
 [[Category:Atmosphere]]
 [[Category:MM5]]
 [[Category:WRF]]