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Open-File Report 2007–1194

Documentation of the U.S. Geological Survey Oceanographic Time-Series Measurement Database

Conversion to Climate-Forecast (CF) Convention Compliance

Historical experiment data were generated as EPIC-compliant files. In 2016 (corresponding with version 2.0 of this OFR) a python program was developed to convert the EPIC files to CF. In 2019, python programs were developed to generate CF-compliant files directly. Since EPIC is seldom used now (2021), most data will be released only as CF-compliant files; exceptions may occur, especially with relatively old or infrequently used instruments for which Matlab processing scripts for the EPIC convention exist and no CF conversion script is available. If a global attribute named "Conventions" is present in a file, its value will indicate whether the file conforms to EPIC or CF conventions. Files missing this attribute are EPIC-compliant. Table 9 lists additional characteristics for identifying the convention employed.

Table 9. Key differences between Equatorial Pacific Information Collection (EPIC) and Climate and Forecast (CF) files.

Characteristic EPIC CF
Has global attribute “featureType” No Yes
Has only time, z, or sample dimensions No Yes
Has variable attribute “coordinates” No Yes
Has “time2” dimension and variable Yes No
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