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Re: NetCDF: Converting time variable using start time from "units" [message #91904 is a reply to message #91903]

Mon, 14 September 2015 15:29

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 9/14/15 2:33 PM, Larry H. wrote:
> I've been reading and writing NetCDF files using IDL for some time.
> Now I'm wondering whether there's a better way to convert the values
> in the "time" variable to real times than by using ncdump to get the
> units from the attributes and then hard coding the offset into my
> routines. I can read the units, e.g.,
>
> time:units = "minutes since 2007-01-26 01:30:00"
>
> using ncdf_attget, but don't know of any way IDL can understand this
> information and automatically apply the offset to the values in
> "time". I've heard a rumor that this can be done. Any suggestions?
> Thanks.
>

I have a basic routine to do this MG_CF2JULIAN to convert from the CF
convention in netCDF to Julian time:

https://github.com/mgalloy/mglib/blob/master/src/calendar/mg _cf2julian.pro

This handled my needs, but I think is fairly general. Please let me know
if there is more you need from it.

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)

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[Message index]

		NetCDF: Converting time variable using start time from "units" By: laura.hike on Mon, 14 September 2015 13:33
		Re: NetCDF: Converting time variable using start time from "units" By: Michael Galloy on Mon, 14 September 2015 15:29
		Re: NetCDF: Converting time variable using start time from "units" By: laura.hike on Tue, 15 September 2015 08:32
		Re: NetCDF: Converting time variable using start time from "units" By: David Fanning on Tue, 15 September 2015 08:40
		Re: NetCDF: Converting time variable using start time from "units" By: laura.hike on Tue, 15 September 2015 13:52
		Re: NetCDF: Converting time variable using start time from "units" By: laura.hike on Tue, 15 September 2015 14:17

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