Re: [thredds] NcML Aggregation Question - Not wanting time as strings

I will add that:
my reading of the CF standard is that coordinate (AKA axis, AKA dimension) variables must be numeric:
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#terminology
says
"coordinate variable
We use this term precisely as it is defined in section 2.3.1 of the NUG. It is a one-dimensional variable with the same name as its dimension [e.g., time(time)], and it is defined as a numeric data type with values that are ordered monotonically. Missing values are not allowed in coordinate variables. "

So, it would be great if THREDDS could extract the date coordinates from the file names and make a *numeric* time coordinate/axis/dimension variable.

I know that choosing the units brings up other issues. Perhaps they could be specified by the THREDDS administrator, or perhaps THREDDS could just always use units="seconds since 1970-01-01".


On 9/6/2011 3:37 PM, Roy Mendelssohn wrote:
Hi All:

The following has come up in a problem we are working on:

I'd like to aggregate files as in the example toward the bottom of:

http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/Aggregation.html

"Extracting date coordinates from the filename"

The text in the tutorial states:

'The net effect is to add a coordinate variable, whose values are ISO
8601 formatted date/time Strings, with a _CoordinateAxisType of
"Time" ..."

Is there any for this variable to be a timestamp rather than date/time
Strings?

Listing the values is not that practical since there are over 3000 files and 
the number will grow.  Thanks for any help.

-Roy

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Roy Mendelssohn
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NOAA/NMFS
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Sincerely,

Bob Simons
IT Specialist
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