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Hi Jim:yes, coordinate variables should not have fill values and must be strictly monotonic. auxilary coordinate variables do not have those restrictions, so your example looks valid to me.
John On 11/15/2010 7:28 AM, Jim Biard wrote:
Hi.While reading the CF conventions regarding coordinate variables, I found that coordinate variables are not supposed to have any "fill" values. This makes sense to me. Does this same restriction hold for a variable that is identified as an auxiliary coordinate via the "coordinates" attribute on another variable? If both variables are telemetry measurements, and thus subject to having missing values, can one be validly used as an auxiliary coordinate variable, or should this linkage not be made? The example pseudo-CDL below describes what I am wondering about.dimensions: cycle = UNLIMITED; variables: double acq_time(cycle); // telemetry measurement string start_time:units = "seconds since ..."; start_time:_FillValue = -999.3; float baseplate_temperature(cycle); //also a telemetry measurement string baseplate_temperature:units = "degrees C"; baseplate_temperature:_FillValue = -999.3; string baseplate_temperature:coordinates = "acq_time"; Grace and peace, Jim Biard -- Jim Biard Government Contractor, STG Inc. Remote Sensing and Applications Division (RSAD) National Climatic Data Center 151 Patton Ave. Asheville, NC 28801-5001 jim.biard@xxxxxxxx 828-271-4330 _______________________________________________ cf-satellite mailing list cf-satellite@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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