Re: [gembud] GOES17 plotting via gpmap

Thanks for your great suggestion.  With that technique of GAREA=DSET and
then "cursor garea" I was able to see that this GAREA selection:
GAREA = 30.1;125.5;44;115

produces this image from the current GOES17 CONUS vis (Channel02):

So, yes the longitude positive is the opposite of standard GEMPAK.

When I plot the the same GAREA with IR (Channel14) I get this plot, where
the shading looks reversed (white is warm):

( This is with standard $GEMTBL/sat/imgtyp.tbl values as:)
GOES17 CH14 11.2um   IR            0    255   188  2**13      1 GRAY

I tried tweaking this to
 GOES17 CH14 11.2um   IR            0    128    188  2**13      1 GRAY

but I get a white map:

Where might I look to reverse the color ramp?  Or, could there be something
else fairly obvious I'm missing?

Thanks again for the tips; this is much appreciated!


On Fri, Jul 26, 2019 at 5:32 AM Scott Jacobs - NOAA Federal <
scott.jacobs@xxxxxxxx> wrote:

> 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 of my outdated satellite images scripts with newer GOES17 images from the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.
>> 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:
>> And then interestingly when I plot the Full Disk image and use GAREA=US,
>> I get this:
>> 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:
>> and
>> GAREA=-179;10;-140;30
>> produces
>> 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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Mike Voss
SJSU Meteorology
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