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20050210: Netcdf Radar Files in IDV

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  • Subject: 20050210: Netcdf Radar Files in IDV
  • Date: Tue, 15 Feb 2005 05:34:20 -0700
>From: Ryan May <address@hidden>
>Organization: University of Oklahoma
>Keywords: 200502101535.j1AFZ3v2029303  IDV netcdf sweep files

Hi Ryan-

>Setting the default data type unfortunately makes the file disappear 
>from the list unless I label it properly (which i deduced from the 
>code): ncswp.test.nc

Actually, you just need to set the Data Source type (at top of chooser) to 
Netcdf Sweep files instead of the file filter.  That will allow
you to see all files without having to name accordingly.  At this point,
there is no netCDF "sniffer" to determine the type of file.  We hope
to be able to do this with the new netCDF work.

>This allowed me to get it to open as radar file and exercise the radar 
>IO code paths, which led me to my next problem.  It seems that the radar 
>netcdf IO code assumes that the moment fields are stored as short 
>values, since my original float values caused an exception at that point 
>and writing my data out as scaled shorts solved the problem.  Now that 
>I've scaled the data, I can't seem to get the IDV to unscale it 
>properly.    Also, it doesn't seem to notice what I have set as the 
>_FillValue to properly identify missing data.

The code is pretty brain-dead as you have found. It does not support
packed variables, nor does it account for missing data.  I won't
be able to look at a solution for this until next week, though.

>I would be very interested in reviewing this in the hopes of making the 
>IDV a tool I can really use.

Okay, I've cc'd Doug Lindholm who will contact you with the particulars.

Don Murray
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