Re: [idvusers] time loop issues


Sorry for taking so long in getting back to you--I've had to deal with some 
other things, so this got lower priority. I tried the methodology you suggested 
below, but I'm still getting an error:

Creating display: Contour Plan View

I attempted to aggregate by time once more, and I'm getting slightly different 
behavior now--the grids are loading, but one on top of another--they aren't 
shifting location like they should as the hurricane moves (the shifting does 
show up if the grids are loaded individually). I've uploaded the files to the 
motherlode server, as 2010083100_earl.tar. It contains 3 forecast hours, which 
should be enough to test the time stepping. I've created the NetCDF files 
myself, so it is possible that I'm not setting something up properly when I 
create the files.

Thanks again for looking into this.


Dr. Daniel P. Tyndall
NRC Postdoctoral Research Associate
United States Naval Research Laboratory
7 Grace Hopper Avenue Stop #2
Monterey, CA 93943
Phone: (831) 656-4054 - Fax: (831) 656-4769 - Email: 

-----Original Message-----
From: idvusers-bounces@xxxxxxxxxxxxxxxx 
[mailto:idvusers-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Don Murray
Sent: Friday, February 03, 2012 5:31 PM
To: idvusers@xxxxxxxxxxxxxxxx
Subject: Re: [idvusers] time loop issues

Hi Dan-

On 2/3/12 4:17 PM, Tyndall, Dr. Dan, Contractor, Code 7531 wrote:
> Hello fellow IDV users,
> I'm having issues with the time looping in IDV. I have a bunch of NetCDF 
> files with individual forecast hours, and I would like to be able to use the 
> playback controls to be able to step through the grids. Unfortunately, the 
> grids will stay up on the screen when they shouldn't.
> I've already tried the "aggregate grids by time" option, which works 
> to a point--provided the grid doesn't change, I can use the playback 
> controls. However, if I have a nest following a hurricane, IDV fails 
> to load the data. Are there any workarounds for this? I've found this 
> issue come up in the IDVusers archive, although, they were brought up 
> a while ago, so I am hoping there has been an update to the code to 
> fix this. Thanks,

I'm not sure if this will work, but load in each dataset individually and then 
use the Forumala->Grid->Time Steps->Merge time sequences formula and select 
each dataset.

"Aggregate grids by time"  uses netCDF-Java aggregation via NcML which 
assumes that all grids have the same spatial domain.   If there is only 
one timestep per grid, the IDV will show the timestep on all frames.  If the 
above suggestion doesn't work, could you could package up the files in a zip 
file and upload to:

and someone could look into a solution.

Don Murray

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