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20030923: nex2img stuff
- 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
> */
>
>