linux-tools - Güralp Systems Ltd

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Güralp Systems Linux tools 5 Configuration files 5.1 gcf-to-miniseed The configuration file for the gcf-to-miniseed utility consists of three major components: general options, output options, and channel mapping. The format of the configuration file is an ASCII text file with one option per line. Whitespace and blank lines are ignored. Anything after a '#' symbol on a line is considered a comment. Each line is either option = value or [sectionheader]. Quotes are not used in the file itself. 5.1.1 General options These appear at the top of the file, before any section header. The available options are: • corrupt_gcf_blocks: this can be discard (throw away invalid GCF blocks), data_quality (decode invalid data blocks and set the SEED data quality flags in the Mini-SEED record header), or warn (decode the invalid blocks, warn the user, but don't alter the output SEED). • discard_byte_pipe: some digitisers have a “byte pipe” mode where bytes read on their serial input port (“Data In”) is stored in an opaque GCF block (channel name ending BP) and transmitted at regular intervals. If such blocks are detected, they are output in a similar manner to SOH data in Mini-SEED. Setting this option to true will discard these blocks; false will keep them. 5.1.2 Output options These appear below a [miniseed] section header. • record_size: the size of record as a power of two. Output record will consist of 2 record_size bytes. This has a minimum value of 8 (256 bytes), a maximum value of 20 (1048576 bytes, or 1 MiB) and a default value of 12 (4096 bytes) if omitted. • endian: the endianness of the data. May be big or motorola for most-significant byte first, or little or intel for least-significant byte first. If omitted, the default is big endian. • file_length: the length of output file segments, in seconds. One new file is created for each segment (depending on your naming 26 Issue E
User guide scheme). This has a minimum of 10 seconds and a maximum of 86400 seconds (one day). Data recorded on a leap second at 23:59:60 count as being at 23:59:59 for the purposes of determining output segment. • soh_length: the length of output file segments for ASCII SOH (state of health) data and byte pipes. If omitted, the value of file_length is used. • output_filename: the template used to generate the name of each output file. See section below for details. The template may specify a relative or an absolute path. If relative, files are created relative to the directory in which gcf-to-miniseed is run. 5.1.3 Channel mapping In manual mapping mode (and in auto mapping mode, if overrides are desired), each GCF block name must be mapped onto a SEED name. This is achieved with a section header consisting of the GCF name: [SYSIDSTRID]. Below the section header, a single option called seedname specifies the mapping, e.g.: [SYSID-STRID] seedname = STA.CHA.NET.LOC [SYSID-STRID] seedname = STA.CHA.NET [SYSID-STRID] seedname = STA.CHA [SYSID-STRID] seedname = STA.CHA..LOC Following SEED 2.4 conventions, station must be 5 characters or less (uppercase A-Z and 0-9), channel must be 3 characters or less (A-Z, 0-9), location must be 2 characters or less (A-Z, 0-9), and network must be 2 characters or less (a-z, A-Z, 0-9). Either network or location may be omitted. 5.1.4 Output file names Output files are created according to the scheme specified in the output_filename option of the [miniseed] section. This gives a template used to create output filenames. If the template is static, all Mini-SEED records will be written to a single file. Otherwise, the following tokens within the file are replaced: October 2013 27
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linux-tools - Güralp Systems Ltd

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