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#95: Development of CF 1.5 Data Model -----------------------------+---------------------------------------------- Reporter: markh | Owner: [email protected] Type: task | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: -----------------------------+---------------------------------------------- Comment (by taylor13): Hi all, Just to note one use case (CMIP5 specifications) where, perhaps mistakenly, it was assumed that attributes appearing both as global and (with different text) as variable would be concatenated to provide more complete information. The assumption wasn't that if the variable attribute was present it would supersede/override the global one. Note that the description below distinguishes between types of information that might appear in comment and history attributes which would be common among variables vs. different from one variable to the next. Here's the description of the relevant CMIP5 attributes taken from http ://cmip-pcmdi.llnl.gov/cmip5/docs/CMIP5_output_metadata_requirements.pdf : CMIP5 optional GLOBAL attributes: comment = A character string containing additional information about the data or methods used to produce it. The user might, for example, want to provide a description of how the initial conditions for a simulation were specified and how the model was spun-up (including the length of the spin- up period). history = A character string containing an audit trail for modifications to the original data. Each modification is typically preceded by a "timestamp". The "history" attribute provided here will be a global one that should not depend on which variable is contained in the file. A variable-specific "history" can also be included as an attribute attached to the output variable. CMIP5 optional VARIABLE attributes: comment = a character string providing further information concerning the variable (e.g., if the variable is mrso (soil_moisture_content), the comment might read "includes subsurface water, both frozen and liquid, but not surface water, snow or ice"). history = a character string containing an audit trail for modifications to the original data (e.g., indicate what calculations were performed in post-processing, such as interpolating to standard pressure levels or changing the units). Each modification is typically preceded by a "timestamp". Note that this history attribute is variable-specific, whereas the global history attribute defined above (see "Optional attributes" under "Requirements for global attributes") provides information concerning the model simulation itself or refers to processing procedures common to all variables. Don't know if this is helpful, but thought I'd pass it along. Best regards, Karl -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/95#comment:89> CF Metadata <http://cf-pcmdi.llnl.gov/> CF Metadata This message came from the CF Trac system. To unsubscribe, without unsubscribing to the regular cf-metadata list, send a message to "[email protected]" with "unsubscribe cf-metadata" in the body of your message.
