Time Settings for Data

[Colarco, Peter R. (GSFC-6133)]

Jason-

You can achieve the desired result by writing a control file (sometimes called a data descriptor file) to redefine the times on one set of files to match the times on the other set.

For example, the contents of the data descriptor file might look like

DSET filename_template.%y4%m2%d2.nc4
OPTIONS template
TDEF time 8 linear 0z1jan2009 3hr

where in my example filename_template.%y4%m2%d2.nc4 is the path and filename template describing the dataset you wish to modify and I assume you are dealing a total of 8 times spaced 3 hours apart in time.  You'd need to edit that DSET line to look like the particular filenames you're working with, obviously.  See the documentation for data descriptor files: http://www.iges.org/grads/gadoc/descriptorfile.html and look especially at the link for "Using Templates".

Then you can xdfopen the data descriptor file to work with that data set and open the other file set as before.

Pete




On Jan 21, 2010, at 2:43 AM, Jason Snyder wrote:

I have a data set with time signatures so that at time 1 (when I enter set t 1) for example the date is January 1 2009 3:00z.  There is another data set that I want to use with this data set with time signatures so that at time 1,(when I enter set t 1)  the date is January 1 2009 0:00 z.  How am I able to use the two data sets together in calculations when each has time steps starting on different hours Z (3:00 z versus 0:00 z)?  Or how do I correct the time on the first data set where each time step begins on 3:00 z?

Thanks,

Jason

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Peter Colarco
NASA GSFC
Code 613.3
NASA Goddard Space Flight Center
Greenbelt, MD 20771
301.614.6382 (ph)
301.614.5903 (fax)

peter.r.colarco at nasa.gov<mailto:peter.r.colarco at nasa.gov>
http://hyperion.gsfc.nasa.gov/People/Colarco
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