Mike,
The reverse colors should be investigated. In the meantime, you can go to
the $GEMPAK/tables/luts directory and create a new color look-up table with
the reverse order of the lingray.tbl file. Then change the imgtyp.tbl to
reference this new table instead of the default "GRAY".
Scott
Scott Jacobs
NOAA/NWS/Office of Central Processing
Technology, Engineering and Application Management Team
SSMC2 - 12350
301-427-9413
On Fri, Jul 26, 2019 at 11:58 AM Mike Voss <mike.voss@xxxxxxxx> wrote:
> 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 of my outdated satellite images scripts with newer GOES17 images from the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
>
