Steve,
Thanks for the ideas. Unfortunately, these are the exact setting I am using
without success. From there, I tried many others without improvement. I
even tried re-typing the settings thinking my cut-and-paste might have
included bad characters. I also took a correct N0R mosaic and tried to use
it in the CPYFIL entry. It didn't like that.
Can you think of any other config files in GEMPAK where grid navigation
might be affected?
John H
----- Original Message -----
From: "Steve Chiswell" <chiz@xxxxxxxxxxxxxxxx>
To: "john" <john@xxxxxxxxxxxxxx>
Cc: <gembud@xxxxxxxxxxxxxxxx>; "GEMPAK support"
<support-gempak@xxxxxxxxxxxxxxxx>
Sent: Friday, September 28, 2007 11:35 AM
Subject: Re: [gembud] nex2gini navigation errors in GEMPAK
John,
When creating a GINI format product, the projection and data area have
to be compatible with the GINI projection model- eg, when using an LCC
projection,
you have to specify a tangent cone and not a secant cone (eg angle1 ==
angle3)
since GINI itself only supports that special case.
Also, the lat/lon boundaries have to be representable to the precision
of numbers
that can be expressed in the GINI header. If you attempt to create a
boundary where the computed DX and DY of the pixel are not compatible,
your image projection will
be shifted. The example in the help for nex2gini provides an example of
a valid region:
GRDAREA = 23;-120;47.2634;-63.5664
PROJ = lcc/40;-100;40
KXKY = 4736;3000
Steve Chiswell
Unidata User Support
On Fri, 2007-09-28 at 09:34 -0600, john wrote:
I am running Gempak 5.10.3 on Fedora Core 6 at home. I installed from
source, and everything works fine. I have a NOAAPORT feed providing
data, and that too is working fine. All single site radar data is
visible in NMAP and looks great.
I am attempting to use nex2gini to created mosaic radar images. I am
using the example settings from chiz for creating a 1km mosaic. The
program runs without error, and creates a file of proper size (compared
to examples of good ones from other sources).
My problem is, the navigation is messed up on all the images. Data is
displaced by 50-100 miles. Looping the images in NMAP show that the
errors are consistent. I have made numerous attempts using different
projections, gareas, station tables, kxky values, etc. All images come
back with displaced nav when displayed in NMAP or gpmap. Running nex2img
results in the same thing.
This morning I cleaned and remade GEMPAK. No errors. No change in
output.
Anyone have any ideas? I'm stuck.
John Hart
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Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
Unidata
