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20030923: nex2img stuff

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  • Subject: 20030923: nex2img stuff
  • Date: Tue, 23 Sep 2003 12:11:34 -0600
Daryl (and Kevin),

1) The Unidata release can be downloaded as source or binary from our web site.
I would have to double check in linking against the NCEP distribution as
to the specific error (you may have a problem with a different IMGDEF.CMN).
Here is the particulars I sent to Gregg Groshans:

*************************************************************************
Gregg,

You can get the distribution via the web. If you are running Linux,
then the easiest way would be to grab the binary and take the programs
from bin/linux. Also, you will need the $GEMTBL/unidata directory for
nex2image to place the appropriate platformID and calibration numbers in
the GINI header (Also grab the entries from $GEMTBL/sat/imgtype.tbl and
the color enhancements from $GEMTBL/luts mentioned in the imgtype.tbl file).

With NCEP's plotting, you won't get a calibration bar for the images.
Our distribution has additional code to create image calibration bars.
*******************************************************************************


As for 2), A composite of radial velocity is not really meaningful.
It is only the radial component. The tangential wind is not provided.
This is not a dual-doppler analysis - which can be done with the
level II data-- NIDS images are just data bins. You could estimate
U & V components along the bisection of the overlap regeion, but otherwise 
would be indeterminant (note that "away" values from one radar would be 
"toward" values in an adjacent image.

Since I have to create my status reports for user and policy committees this
week, your comments are welcomed and well timed.


Steve Chiswell





>From: Daryl Herzmann <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200309231418.h8NEIek1011225

>Hiya UNIDATA!
>
>I have gotten a lot of positive feedback on your nex2img program and have 
>accumulated a few questions and suggestions...
>
>1.  I have gotten a few requests from folks in the NWS/NOAA that are 
>    having problems compiling nex2img with their NCEP(?) supplied 
>    GEMPAK environment.  Kevin Slover (cc'd) wrote to me with issues 
>    compiling against version 'L'.  He would like to try UNIDATA's 
>    release of GEMPAK or find out how to get nex2img into their 
>    version.  Any insights here?
>
>2.  Does nex2img 'do the right thing' when it comes to velocity 
>    products? I realize compositing them is a beast, but most folks
>    just want to generate a single site geotiff.  Looking at the 
>    nex2gini.tbl, I notice a lack of velocity products.  Can I 
>    just add them in there?
>
>I currently have 5-10 hosts routinely downloading the nationwide composite 
>I generate every 5 minutes.  The response has been very good.  Thanks for 
>creating the nex2img program to make this possible.
>
>Thanks,
>  Daryl
>
>-- 
>/**
> * Daryl Herzmann (address@hidden)
> * Program Assistant -- Iowa Environmental Mesonet
> * http://mesonet.agron.iastate.edu
> */
>
>