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Re: NetCDF and empty variables [message #66189 is a reply to message #66142]

Wed, 22 April 2009 17:29

Mark[1]
Messages: 66
Registered: February 2008

Member

On Apr 22, 4:03 pm, David Fanning <n...@dfanning.com> wrote:
> Yeah, so what does that mean that it has an unlimited
> dimension. Why would someone do that? :-)

Say you have an ocean model with a rectangular grid. For your output
netCDF files you would probably have fixed dimensions (x, y and z) for
the three spatial dimensions of the model and you would have an
unlimited dimension (t) correspond to simulated time. Your model grid
variables would depend on the fixed dimensions in various combinations
and you would write this info at the beginning of the model run. Your
model state variables (temperature, salinity, velocity components)
would depend on x, y, z AND t, and you would write snapshots of these
as the model runs, stepping along the t dimension each time. By making
the t dimension unlimited you don't have to know how many snapshots
you're going to write in advance. If the model hasn't written any
snapshots yet--perhaps it crashed before it could--then the size of
the time dimension is 0.

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[Message index]

		NetCDF and empty variables By: renaud.dussurget on Fri, 17 April 2009 06:18
		Re: NetCDF and empty variables By: Mark[1] on Wed, 22 April 2009 17:29
		Re: NetCDF and empty variables By: David Fanning on Wed, 22 April 2009 08:29
		Re: NetCDF and empty variables By: David Fanning on Wed, 22 April 2009 07:30
		Re: NetCDF and empty variables By: David Fanning on Tue, 21 April 2009 21:03
		Re: NetCDF and empty variables By: Mark[1] on Tue, 21 April 2009 20:48
		Re: NetCDF and empty variables By: David Fanning on Tue, 21 April 2009 11:38
		Re: NetCDF and empty variables By: renaud.dussurget on Tue, 21 April 2009 08:49

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