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Re: Recent Version of LDM Required to Receive NEXRAD Data

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  • Subject: Re: Recent Version of LDM Required to Receive NEXRAD Data
  • Date: Mon, 04 Dec 2000 15:30:24 -0700
Gregory Grosshans wrote:
> 
> Presently the SPC is using modified acqserver code, originally from FSL,
> to inject 2-4 NOAAPORT channels into LDM 5.1.2.  All products are being
> inserted in the queue with the same feedtype (e.g. WMO).  The NWSTG
> products are modified to look like a FOS feed.  The most recent version
> of LDM allows numerous feed types for the various data sets flowing
> through NOAAPORT.    The SPC uses LDM to receive and move data around
> in-house.  We don't feed any data sets across our WAN, and if we do, the
> downstream user would likely request  a subset  with the 'request' line.
> Can you tell me is there any advantage to LDM performance if one actually
> breaks up the NOAAPORT stream and assigns various feedtypes to different
> product categories?
> 
> Thanks,
> Gregg

Hi Gregg,

I can think of only one significant way that multiple feed
types might improve performance.  I suspect there would be a
performance improvement in matching patterns to product IDs,
i.e., I assume that the LDM would first look at a product's
feedtype and rule out products with non-matching feed types
before attempting to match a pattern against the ID.  Since
pattern matching can be costly performance-wise, eliminating
a significant number of products from that test might make a
difference.

Anne
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Anne Wilson                     UCAR Unidata Program            
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