Re: [idvusers] How do you time step 3-hourly NARR data in the IDV?

could someone post actual URLs that you are using? thanks

On 1/3/2012 10:54 AM, Tom Whittaker wrote:
Hi Mike...

Yes, I can duplicate the issue with the 3D (narr-a) data.  The problem
appears to be related to there being two "time" variables/dimensions
in those least the "aggregated" view of them.  I think this
should be sent in as a bug report.

Either way, though, if you "choose" the individual files, you can then
create a Display using the "Formulase ->  Misc->  Make a time
sequence...".  You will have to pick the variable you want from each
file in the pop-up widget (and be sure to click "Add selected>>"
button after each one.  It's a good idea to pick a "level",
too...unless you are doing an isosurface; otherwise, the default range
of the color table will be for all levels...and you'll have to set it
for whatever level you are looking at.

Hope that helps...


On Tue, Jan 3, 2012 at 11:25 AM, Mike Umscheid<mike.umscheid@xxxxxxxx>  wrote:
Oh wow, I never even considered that drop down box in the Chooser!  That's
exactly what I am looking for.  I am able to aggregate successfully using
the narr-b files like you said... however, the narr-a files which have the
3D fields, are not being parsed correctly or something.  After loading the
aggregated grids and doing a right-click Properties>>  Times, I see all the
aggregated times, but when you go and select any of the fields (either 2D or
3D), the Times tab only displays one default time instead of the total
number of aggregated times.  I wonder if this is a software bug??  Try doing
the same thing for the narr-a files and see if you can duplicate this...

Mike U

On Tue, Jan 3, 2012 at 10:58 AM, Tom Whittaker<whittaker@xxxxxxxx>  wrote:
Mike --

Thanks for the link.  Try this:

In the Chooser, select the individual .grb files (CTRL+click) and then
set the "Data source type" as "Aggregate grids by time"....that worked
nicely for me (I assuming that the data sets you want are the ones
under the dates, with names like:  "narr-b 221 20111229 2100


On Tue, Jan 3, 2012 at 10:43 AM, Mike Umscheid<mike.umscheid@xxxxxxxx>
Thanks for the reply Tom,

I am not having any luck with 2 or 3... but it does sound like I need to
investigate option 1 as I am not all that familiar with NCML in
datasets.  The NARR data I have been using is straight from the NARR
through the IDV
(  So I
what I would need to do then is save the individual hourly dataset as a
local grid (*.nc) and then use one of the available tools (I see
called ToolsUI?) to merge the files into one netCDF?

Mike U

On Tue, Jan 3, 2012 at 9:50 AM, Tom Whittaker<whittaker@xxxxxxxx>
Hi Mike...

The display rule is that if the data object has only one time, then it
is displayed along with all other "time steps"; hence, since both 18z
and 21z data have just one "time", they are displayed together.

I'm not familiar with the NARR data or how you are loading it, but
there are a couple of ways to make individual time period data be

1. using NCML to logically combine times
2. using the Chooser and picking more than one time/file using
SHIFT+click or CTRL+click
3. using the Formula under "Miscellaneous ->  Make a time sequence from
single time grids"

Hope this helps.


On Tue, Jan 3, 2012 at 9:13 AM, Mike Umscheid<mike.umscheid@xxxxxxxx>
IDV Users,

I'm not sure how many of you interrogate NARR datasets on the IDV,
doing more of it now through the IDV using bundles and ISL scripts.
big limitation I am finding is that I cannot time step/animate
than one data file on the Map View pane.  For instance, if you load
fields from an 18z file and then also a 21z file, the IDV just
21z data right on top of the 18z data.  How do you configure the IDV
that for these hourly dataset files you can create animations and
and forth through various times?  Any help/guidance is appreciated!

Mike U
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Tom Whittaker
University of Wisconsin-Madison
Space Science&  Engineering Center (SSEC)
Cooperative Institute for Meteorological Satellite Studies (CIMSS)
1225 W. Dayton Street
Madison, WI  53706  USA
ph: +1 608 262 2759

Tom Whittaker
University of Wisconsin-Madison
Space Science&  Engineering Center (SSEC)
Cooperative Institute for Meteorological Satellite Studies (CIMSS)
1225 W. Dayton Street
Madison, WI  53706  USA
ph: +1 608 262 2759