Scott,
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):
http://www.met.sjsu.edu/weather/images/test/goes17-CONUS-test.gif
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):
http://www.met.sjsu.edu/weather/images/test/goes17-CONUS-IR-test.gif
( 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:
http://www.met.sjsu.edu/weather/images/test/goes17-CONUS-IR-test2.gif
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!
-Mike
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 of my outdated satellite images scripts with newer GOES17 images from the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.
>> 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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>
--
Mike Voss
SJSU Meteorology
408.924.5249
