Technical Report No. ? - DKRZ

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2.2 THE EXTRA-FORMAT 2.2.1 Outline DKRZ GRIB/EXTRA Format Module Documentation The EXTRA-Format was created at the Meteorologisches Institut der Universität Hamburg for the data output of its T21-General Circulation Model. It has been adopted by the MPI for their model outputs and many of their sets of observational data. The EXTRA-Format has an extremely simple structure, which allows for a wide range of types of data to be included. The data sets classified this way include: Spatial fields of one variable; Sequences of spatial fields of several variables; Time sequences of spatial fields; Sets of a given field over several levels; Time series of single variables. This simplicity makes for versatility, enabling a relatively small number of program modules to do a very wide range of processing options and enables a user to transfer every dataset into the EXTRA-Format. However, the simplicity also means that much information important to the data sets is not included in the sets themselves. For example, data that represent spatial fields are not indicated as such, nor is the geographical location of the points indicated. The user must therefore obtain the relevant information about the data sets before using them. 2.2.2 The System The EXTRA-Format system comprises Data sets and Program modules. The structure of the data sets is described in section 3.1 . The program modules are listed in section 4.2 . The method of calling the programs is given in section 4.3 . Information about the implementation on all computers at the DKRZ and at the KNMI in DeBilt are given in section 4.4 . A description of the online help system is given in section 4.5 and some examples pointed out in section 4.7 . The details of all the program modules can be found in section 4.6 . 2.2.3 Method of Use • The user establishes which data set(s) he wants to use, and clarifies their structure. • The user runs the program modules using very simple UNIX calls. This will result in various derived data sets. • The user may, if desired, write programs that read the derived data sets (or the originals) and generate further results. It is recommended that the user writes his programs in such a way that they will read any EXTRA-Format file, and writes their output also in EXTRA-Format, when appropriate. • The EXTRA-Format data sets can be displayed with the included plot programs, isolines can be plotted easily with the ISO plot package. PAGE 2.2.1
3. GRIB-FORMAT PROGRAMS DKRZ GRIB/EXTRA Format Module Documentation In this section programs for computation of GRIB files are described. It is recommended to use the programs in the bourne shell. They are available after execution of the command PATH=$PATH:$GRIB All programs have upper case and lower case names. This is useful, if there are other programs with conflicting names. The directory containing these programs can be specified in the execution path environment variable PATH prior to the directory mentioned above; then both programs will be available. The general calling sequence for all programs is prog [+|-] file1 file2 file3 ... where prog is the name of the program and file1, file2, ... are names of data files. Standard files INPUT and OUTPUT can be redirected by the UNIX mechanism using ’’ for OUTPUT. See UNIX manual page ’sh’ for further information. Some programs can read parameter lists from standard INPUT; this can be suppressed by a ’-’ or forced by a ’+’ as first parameter. For default action see single program descriptions. Meaningless specifications of ’-’ and ’+’ as first parameter are ignored. PAGE 3.0.1
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Notes Example DKRZ GRIB/EXTRA Forma
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3.4.9.1 GLOBAVG Calling sequence Pu
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3.4.10.5 ANOMAL Calling sequence Pu
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3.4.11.1 FINDAN Calling sequence Pu
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4.4.3 CONVEX 1 DKRZ GRIB/EXTRA Form
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4.6.1.1 sadd Purpose Adds a constan
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4.6.2.1 cadd Purpose Adds a constan
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4.6.3.1 add Purpose DKRZ GRIB/EXTRA
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4.6.3.3 div Purpose Divides the dat
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4.6.3.5 merge Purpose DKRZ GRIB/EXT
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4.6.4.1 anomal Purpose Computes ano
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4.6.4.3 recon Purpose DKRZ GRIB/EXT
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4.6.5.1 anorm Purpose DKRZ GRIB/EXT
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4.6.6.1 avg Purpose DKRZ GRIB/EXTRA
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4.6.10.1 selbox Purpose DKRZ GRIB/E
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