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20050505: NIMAGE feed (cont.)

>From:  Steve Chiswell <address@hidden>
>Organization:  UCAR/Unidata
>Keywords:  200505051733.j45HXIP3025099 NOAAPORT IDD

Hi Tim,

As Chiz has explained in his previous emails and as we talked about before
I left for Europe, the only products from the NOAAPORT broadcast conveyed
in the IDD that you will need to anything to are the products from the
IDS|DDPLUS stream.  All others are relayed unaltered.

  >Got your phone message. The NIMAGE data is just what is on NOAAPORT.
  >The zlib compression is what SBN uses to compress each block of the
  >image. It is not something that I am doing. If FSL can read the
  >compressed images from their feed, it should be the same as our feed.
  >
  >The GEMPAK code I write to read the zlib data follows the same
  >proceedure as is used to read the Nexrad level III data which
  >is compressed on NOAAPORT. The initial WMO header
  >is read, then each zlib block is uncompressed to recreate the original
  >message that SBN compressed.
  >
  >Steve Chiswell
  >Unidata User Support

Cheers,

Tom
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