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17.2 GEMPAK Decoders: Importing ASCII data

Decoding Data into GEMPAK Format

Importing data for use with GEMPAK

 The "DC"-style decoders provide the basis for converting standard products found in the FOS stream and other sources, such as the NCEP ftp server, and case study data sets. However, it is possible that you will have special data sets from your own field experiments, mesonets, or research projects. These data sets can be imported into GEMPAK for use with the plotting and analysis programs, but you will need to help GEMPAK by placing the data into a format it can recongnize. Alternatively, you may have archived data from standard reporting sites, however, the data may no longer be in its native format if someone decided they could store the data in a "better" format than it was reported in.

The GEMPAK "Edit" programs can be used to import non-standard data sets into GEMPAK, as well as to modify data values already in GEMPAK files. To modify exiting GEMPAK files, you will need to list the data out into ASCII format using one of the listing programs.

When using the GEMPAK edit programs to import data into GEMPAK file format, a surface data file must already exist; SNEDIT will create a file if one does not already exist.

The file creation programs define the number of times, stations, and parameters that will be stored in the file.

To create a surface file, use SFCFIL
To create an sounding data file use SNCFIL

To import research data sets with stations that aren't present in the standard GEMPAK station tables, you will have to create your own station tables as well! More information on importing data will be covered later.

 


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