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g2ctl

g2ctl takes GRIB2 files and makes GrADS control files.For grib-1 files, see grib2ctl.Once you have made a control file and index file, GrADS canread grib2 files. Note that whenever you update g2ctl, you must update wgrib2.

There is an alternative to the g2ctl/gribmap for making ctl/index for GrADS. alt_g2ctl/alt_gmp were written to handle large datasets andextended grib variable names.

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1/25/2008 First public release

Quick Directions

For analyses:

$ g2ctl -O grib2_file >grib2_file.ctl
$ gribmap -O -i grib2_file.ctl
$ grads
Landscape mode? (no for portrait):
ga-> open grib2_file.ctl

For forecasts (end of averaging period):

$ g2ctl grib2_file >grib2_file.ctl
$ gribmap -i grib2_file.ctl
$ grads
Landscape mode? (no for portrait):
ga-> open grib2_file.ctl

For forecasts (start of averaging period):

$ g2ctl -b grib2_file >grib2_file.ctl
$ gribmap -b -i grib2_file.ctl
$ grads
Landscape mode? (no for portrait):
ga-> open grib2_file.ctl

Longer Directions

You run g2ctl by the following command line,

Important Options

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-verf .. use end of ave/acc period or fcst time (default)
run gribmap with no option
-0 .. use analysis times
run gribmap with gribmap -0
-b .. use start of averaging/accumulation period
run gribmap with gribmap -b
-365 .. use 365 day calendar
-no_profile .. no z coordinate
-raw .. use a raw grid
-ens 'e1,..,en' .. a list of quoted ensemble names

Windows

g2ctl works under Windows. You just have to put a perlbefore g2ctl.

linux: $ g2ctl (rest of line)
windows: $ perl g2ctl (rest of line)

You have to keep in mind the Window filename conventionsare different from Unix/Linux. g2ctl is written for theunix standard. Windows considers upper case A to be the same as a lower case a. Unix allows multiple periods ina filename. Some Windows systems only allow one periodin the filename. If you having problems with g2ctl,convert the input and output filenames to 8.3 and moveall the files to the current directory.

I have tested g2ctl using the cygwin system and I hadno problems. Haven't tried it using another perland the default windows shell. Other people have done it.

Ensembles

G2ctl can support ensembles by
  1. having each ensemble member in its own file
    • g2ctl e1.grb >e1.ctl
    • g2ctl e2.grb >e2.ctl
    • g2ctl e3.grb >e3.ctl
    • gribmap -i e1.ctl
    • gribmap -i e2.ctl
    • gribmap -i e3.ctl
    • $ grads
    • ..
    • open e1.ctl
    • open e2.ctl
    • open e3.ctl
    • d ugrd.1 (note: ensemble member 1 is defined by the first open command)
  2. using a grib2 ensemble template which identifies the ensemble member and all the ensemble members are in the same file.
    • cat e1.grb e2.grb e3.grb >e_all.grb
    • g2ctl e_all.grb >e_all.ctl
    • gribmap -i e_all.ctl
    • $ grads
    • ..
    • open e_all.ctl
    • set ens 1
    • d ugrd (note: ensemble member 1 is defined by the grib metadata)
  3. using a grib2 ensemble template which identifies the ensemble member and each ensemble members is in a separate file.
    • g2ctl -ens 'e1,e2,e3' %e.grb >e.ctl
    • gribmap -i e.ctl
    • $ grads
    • ..
    • open e.ctl
    • set ens 1
    • d ugrd (note: ensemble member 1 is defined by the grib metadata)

Templating

Use the GrADS templating names for creating templated ctl files.For example,
g2ctl pgb.2008010100.f%f3 >forecast.ctl
gribmap -i forecast.ctl
g2ctl -0 pgb.%y4%m2%d2%h2.f00 >analysis.ctl
gribmap -0 -i analysis.ctl
g2ctl -ens 'e1,e2,e3' %e.2008010100.%f2 >ens.ctl
gribmap -i ens.ctl
The supported template names are:
%y4 - four digit year code
%y2 - two digit year code
%m2 - two digit month code
%m1 - one or two digit month code
%d2 - two digit day code
%d1 - one or two digit day code
%h2 - two digit hour code
%h1 - one or two digit hour code
%f3 - three digit forecast hour code
%f2 - two or three digit forecast hour code
%e - ensemble name (specified by -ens option)

Ensemble Templating

Suppose you want to make a control file for the following files:

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Restriction of the Templating Option (prior to v0.1.3)

With templating, a control file can refer to a thousand files.A 'careful' g2ctl would have to search all thousand files for unique variablesand time stamps. However, I am impatient person and I onlyhave g2ctl scan the first, second and last files (in the directorylisting). From these three files, g2ctl finds the variables,initial time (smallest time stamp), time increment (second smallesttime stamp - smallest time stamp) and the ending time (largest timetime stamp). This time-saving strategy can fail for many reasonsincluding,

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  1. Templates using the names of the month (ex. Jan) is not supported.
  2. Template names when sorted must be in chronological order.
    rain%d2-%m2-%y4.grb will not work. rain.%y4%m2%d2%h2.grb will work
  3. Template names must be in one directory. For example, y%y4/rain.%y4%m2%d2.grb will not work.
  4. When GrADS wants data for %y4%m2%d2%h2, it has to be found in the file with the same %y4,%m2,%d2,%h2.
  5. land mask or an other constant field has a time stamp that is unrelated to the forecast or assimilation time stamp. This confuses g2ctl.
  6. time increament has to be fixed. For example, if the first time step is 12 hours, then the ctl file will have a 12 hour time step. This causes problem if the following data has a 3 hour time step.
  7. Templated fields can not be separated by non-digits. good=pgb%y4%m2 bad=%pgb%y4-%m2
  8. There are more situations that are not handled.

If a templated control file can not be made automatically, makethe control file for one file and edit the control file toadd templating.

Restriction of the Templating Option v0.1.3+

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With templating, a control file can refer to a thousand files.A 'careful' g2ctl would have to search all thousand files for unique variablesand time stamps. However, I am impatient person and I onlyhave g2ctl scan the first, second and last files (in chronological order).From these three files, g2ctl finds the variables,initial time (smallest time stamp), time increment (second smallesttime stamp - smallest time stamp) and the ending time (largest timetime stamp). This time-saving strategy can fail for many reasonsincluding,

  1. Templates using the names of the month (ex. Jan) is not supported. (maybe in the future)
  2. All template files must be in one directory. For example, y%y4/rain.%y4%m2%d2.grb will not work.
  3. land mask or an other constant field has a time stamp that is unrelated to the forecast or assimilation time stamp. This confuses g2ctl.
  4. time increament has to be fixed. For example, if the first time step is 12 hours, then the ctl file will have a 12 hour time step. This causes problem if the following data has a 3 hour time step.
  5. If a field exceeds it normal maximum value (ex. hour=23 or minute=59), then that can be the only templated field.

Duplicate Varibles with Different Timimg (ex. FV3)

With FV3, the files may have two accumulated precipations.

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Using 'g2ctl BGDAWP.GrbF04' and 'g2ctl -0 BGDAWP.GrbF04' willonly show one APCP in the control files because both APCP fieldshave the same reference time and 'forecast' times. Using'g2ctl -b BGDAWP.GrbF04' will allow you to display both fields becausethey have a different start of the averaging periods (0 and 3 hours).

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Another way to display both APCP fields is to use alt_g2ctlwith the -0t, -bt or -ft options. The 't' suffix makes theforecast string (like '0-4 hour acc fcst') part of the variable name.So you have to explicity state the forecast string.

Linux/Unix Requirements

  1. wgrib2 installed and on your path.

Windows Requirements

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  1. Cygwin wgrib2 installed and on your path. Other versions windows versionsof wgrib2 will work but will 2GB files. For 32-bit windows, you haveto compile wgrib2 yourself.
  2. Perl, many versions are available and I have no preference.
  3. GrADS v2.0+

    Checking for Aliased Variables

    The GRIB data model is larger than the GrADS data model. For example,a GrADS field has a single time value. A GRIB field could have onetime value (ex. analysis), two time values (ex. 6 hour forecast: start of forecast and the valid time) or even three time values (ex. 12-24 hour precipitation forecast: start of forecast, start of valid period,and end of valid period). Consequently two different grib fieldsmay have the same GrADS time value (ex. analysis valid at 2010-01-01-00,6 hour forecast started from 2010-01-01-00 and a 6 hour forecast startedfrom 2009-12-31-18 and valid at 2010-01-01-00 will have problemno matter which gribmap options are used).

    One way to deal with aliased variables is to store the variablesin separate files and make separate control files. You canalso try alt_g2ctl which has various options

    You can discover some types of aliasing by using the -no_profile option with grib2ctl or g2ctl. The control file will list the number ofvariables that it found. That number can be compared with theexpected number.

    Displaying EUMETSAT grib2 files

    Many EUMETSAT grib2 files are in space view projection andcan not be directly handled by GrADS. However, by doinga couple of steps using wgrib2, we can convert the filesin to something that GrADS can handle using this documenation.

    Problems

    • make sure you have grib2 files (test with wgrib2)
    • make sure wgrib2 is current and on your path, alias doesn't count
    • make sure gribmap is version 2
    • make sure GrADS is version 2
    • only some grids are supported
    • Have a time series of forecasts (ex 12 hour forecast with varying starting time) which has an ensemble identifier (ex control forecast). You have to use the EDEF section in the control file but there is no fixed starting time of the control forecast.
      AFAIK you have to use alt_g2ctl and alt_gmp to handle this situation.

    Status

    Both g2ctl and alt_g2ctl are supported as most of the code iscommon to both control file makers. I (WNE) use alt_g2ctlmore than g2ctl.

    Comments: Wesley.Ebisuzaki@noaa.gov