{ "@context": { "@vocab": "https://schema.org/", "dcat": "http://www.w3.org/ns/dcat#", "dc": "http://purl.org/dc/elements/1.1/", "dct": "http://purl.org/dc/terms/conformsTo", "ecrro": "http://cor.esipfed.org/ont/earthcube/", "ecrr": "https://n2t.net/ark:/23942/g2" }, "@id": "http://n2t.net/ark:/23942/g2463g", "@type": [ "CreativeWork", "Product" ], "name": "Seismic Analysis Code (SAC) Binary Data File", "subjectOf": { "@type": "CreativeWork", "name": "linked web page", "url": "http://ds.iris.edu/files/sac-manual/manual/file_format.html" }, "identifier": "application/octet-stream;type=IRIS-SAC", "description": "SAC binary format. Since version 100.0, SAC can handle binary data files in either endian (byte order), so big-endian systems (Sun Solaris, Mac PPC) can read SAC data files written on little-endian systems (Linux, MAC i686, Cygwin) and vice versa. Each signal is stored on disk in a separate SAC data file. Through SAC version 101.6a, these files contain a fixed length header section followed by one or two data sections. The header contains floating point, integer, logical, and character fields. Evenly spaced data files have only one data section which contains the dependent variable. Unevenly spaced data and spectral data files contain two data sections. For unevenly spaced data, the first data section contains the dependent variable and the second contains the independent variable. For spectral files the first component is either the amplitude or the real component and the second component is either the phase or imaginary component. All reals in the SAC header and data sections are single-precision (32 bits, 4 bytes); although having single-precision for the data is sufficient, having only single-precision for time and distance variables in the header is no longer good enough to handle many modern data sets. SAC version 102.0 solves this problem by adding a 'footer' with 22 header variables in double-precision. Version 102.0 can handle 'old' SAC data files with no footer or files with a footer, so there is complete compatibility. SAC v102.0 distinguishes between 'old' and 'new' files by the header variable NVHDR: if NVHDR = 6, the SAC file is in 'old' format, if NVHDR = 7, it is in 'new' format with a footer.", "publisher": { "@type": "Organization", "name": "Incorporated Research Institutions for Seismology (IRIS)", "identifier": "https://ror.org/05xkn9s74" }, "keywords": "earthquake, seismic event, data interchange", "license": { "@type": "CreativeWork", "name": "not specified", "identifier": "undefined" }, "version": "v102", "funder": [ { "@type": "Organization", "name": "US National Science Foundation (US NSF)", "identifier": "https://ror.org/021nxhr62" } ], "audience": [ { "@type": "Audience", "audienceType": "Data Users", "identifier": "http://cor.esipfed.org/ont/earthcube/AUT_0000002" }, { "@type": "Audience", "audienceType": "Technologists", "identifier": "http://cor.esipfed.org/ont/earthcube/AUT_0000004" }, { "@type": "Audience", "audienceType": "Developers", "identifier": "http://cor.esipfed.org/ont/earthcube/AUT_0000006" } ], "about": { "@type": "DefinedTerm", "name": "Seismology", "identifier": "http://cor.esipfed.org/ont/earthcube/ADO_0000099" }, "isRelatedTo": { "@type": "CreativeWork", "name": "Tutorial, ", "url": "http://ds.iris.edu/files/sac-manual/manual/tutorial.html#sac-data-files" }, "mainEntity": { "@type": "CreativeWork", "url": "http://cor.esipfed.org/ont/earthcube/ECRRO_0000208", "name": "Interchange file format" }, "encodingFormat": "application/octet-stream", "dct:conformsTo": { "@type": "CreativeWork", "identifier": "http://ds.iris.edu/files/sac-manual/manual/file_format.html" }, "additionalProperty": [ { "@type": "PropertyValue", "propertyID": "dc:BibliographicCitation", "name": "Bibliographic citation", "value": "IRIS, no date, SAC Data File Format, http://ds.iris.edu/files/sac-manual/manual/file_format.html" }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0000138", "name": "has maturity state", "value": { "@type": "DefinedTerm", "name": "In production", "identifier": "http://cor.esipfed.org/ont/earthcube/MTU_0000002" } }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0000219", "name": "expected lifetime", "value": { "@type": "DefinedTerm", "name": "More than 5 years", "identifier": "http://cor.esipfed.org/ont/earthcube/ELT_0000002" } }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0000600", "name": "primary publication", "value": "IRIS, no date, SAC Data File Format, http://ds.iris.edu/files/sac-manual/manual/file_format.html" }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0000218", "name": "Stewardship", "value": { "@type": "Organization", "name": "Incorporated Research Institutions for Seismology (IRIS)", "url": "https://ror.org/05xkn9s74" } }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0000017", "name": "Usage", "value": { "@type": "DefinedTerm", "name": "Unknown", "identifier": "http://cor.esipfed.org/ont/earthcube/UBA_0000004" } }, { "@type": "PropertyValue", "propertyID": "ecrro:ECRRO_0001301", "name": "registration metadata", "value": { "@type": "StructuredValue", "additionalType": "ecrro:ECRRO_0000156", "contributor": { "@type": "Person", "name": "Stephen M. Richard" }, "datePublished": "Wed Feb 10 2021 14:26:57 GMT-0700 (Mountain Standard Time)" } } ] }