Mike,
Try to use GAREA=DSET with PROJ=SAT. This should give you the entire domain
of the image file you selected. You can then use "cursor garea" from the
GEMPAK prompt to zoom in on the area you want. I tried this on the G17
CONUS image and the longitude values came back as positive - the opposite
of what GEMPAK normally uses. However, when I used the resultant garea, the
image looked ok.
Scott
Scott Jacobs
NOAA/NWS/Office of Central Processing
Technology, Engineering and Application Management Team
SSMC2 - 12350
301-427-9413
On Thu, Jul 25, 2019 at 3:47 PM Mike Voss <mike.voss@xxxxxxxx> wrote:
> Hi Gembuds,
> I'm a longtime user of Gempak, and maybe 10 years ago I had a little
> better grasp of how it all works. Nonetheless, I'm trying to replace some
> of my outdated satellite images scripts with newer GOES17 images from the
> NIMAGE feed of GOES17 data. So, not the original nc files, but the
> adjusted version supplied by Unidata that theoretically can be plotted in
> Gempak.
> https://www.unidata.ucar.edu/data/nimage.html
>
> My system is running the latest versions of LDM and Gempak at this level:
> Linux vulcan.XXX 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC
> 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> I tried several times to get images to plot via gpmap with various
> standard GAREA entries, but I kept getting this error:
> " [GEMPLT -60] NIMCORD - Invalid image display coordinates."
>
> Then I tried various geographic identifiers. With GAREA=US I got this to
> plot for the CONUS image:
> http://www.met.sjsu.edu/weather/images/test/goes-vis.gif
> And then interestingly when I plot the Full Disk image and use GAREA=US, I
> get this:
> http://www.met.sjsu.edu/weather/images/test/goes-vis2.gif
>
> HMM....strange, somethings seems off with the lat lon registration.
>
> Then I fiddled with adding lat lon corners and got some to work, but plots
> are much farther east than expected:
> E.G.:
> GAREA = -165;15;-155;25
> produces: http://www.met.sjsu.edu/weather/images/test/goes-vis3.gif
> and
> GAREA=-179;10;-140;30
> produces http://www.met.sjsu.edu/weather/images/test/goes-vis4.gif
>
> So, clearly gempak is not reading something about the lat/lon correctly.
> Before I go any further in my "pool sweep" level of troubleshooting, might
> there be a $GEMTBL/sat/imgtyp.tbl adjustment needed here? Or would anyone
> have another tip to help diagnose my underlying issue.
>
> thanks,
> -Mike
>
>
> --
> Mike Voss
> SJSU Meteorology
> 408.924.5249
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