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20040826: IDV - units problem trying to make flow vectors from archived model data (NOMADS)

>From: NATHAN LOUIS UHLENBROCK <address@hidden>
>Organization: SSEC
>Keywords: 200408262003.i7QK3AXn028409 IDV and null units

Hi Nate-

>Here is the url for the DODS info on the dataset:
>
>http://nomads.ncdc.noaa.gov:9090/dods/NCDC_NOAAPort_GFS/200405/20040511/gfs-av
> n_211_20040511_1200_fff.info
>
>To produce the error I did the following:
>1. click add dataset/URL , then put in the DODS url from the above page
>2. the dataset opened and showed up in the data selector window with 2D and 3D
>  data
>3. I opened the 3D data, then the derived data within that and clicked on "flo
> w vectors from u & v" and "vector plan view" for the display type
>4. the IDV gave me the error when I tried to make the display
>
>Also, a very similar error occured when I tried to display the 3D potential te
> mp. in contour plan view the same way as above...I will send in a support for
> m for that as well so you can see the error.  Thanks for the help!
>Cheers,

Again, the problem is that there are no units on the variables that
are sent back (at least not in a machine readable form).  They are
only included as part of the long name of the variable.  Parsing that
out would be problematic.

I'll talk to the THREDDS and NCDC folks about getting units into
the NOMADS system.  I thought they were upgrading to the latest
GrADS-DODS server which serves up these data and that was supposed
to include units in the data.

I had a long converstation with Tom W about this and we will think
of how we might address this on the client end as well.  For now,
the only solution would be to write Jython methods that would do
the calculations for your instead of going through the system
defaults which expect units for correct values.

Don
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