Scott,
Some follow-up on the color reversal. To make sure my system is behaving
"normal" I plotted a Goes15 IR image with gpmap:
GAREA= 19.3;-148.3;52.2;-84.4
lutfil=sabir.tbl
DEVICE= gif|Goes15-IR-test.gif|1000;700
which produces a normal looking image:
http://www.met.sjsu.edu/weather/images/test/Goes15-IR-test.gif
Then, using the same gpmap parameters, aside from the positive longitude
and different name, I plotted a GOES17 image:
GAREA= 19.3;148.3;52.2;84.4
DEVICE= gif|Goes17-CH2-sabir.gif|1000;700
which indeed produces an image with the colors reversed.
http://www.met.sjsu.edu/weather/images/test/Goes17-CH2-sabir.gif
(Also, the positive latitudes work, but there is clearly something
different there as well)
So, the question now I guess is to understand if this is a feature in
GEMPAK, and I need to create work around tables with the colors reversed as
Scott mentioned, or whether there something about the Goes16-17.nc files
that's "off", or might there be another explanation. I'm a little
surprised that I'm the only one having this issue.
Thanks for any comments or advice.
-Mike
On Fri, Jul 26, 2019 at 9:25 AM Scott Jacobs - NOAA Federal <
scott.jacobs@xxxxxxxx> wrote:
> 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
>>
>
--
Mike Voss
SJSU Meteorology
408.924.5249
