[ncl-talk] Question on ocean/inland water fill

[Andrew Kren - NOAA Federal]

That worked, but I set the last value to 0.8 opacity and it said

fatal:_NhlCvtScalarToIndex:Value -16777471 is less than index min -1


Alternatively, is there a way to make a contour where the lowest value is
transparent? This would fix the transparency issue where it plots values
less than 1 as white.


Thanks so much for your help!

On Wed, Jul 13, 2022 at 1:47 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Not sure why it thinks there's a string involved.
>
> Perhaps use the re-assignment operator  ":="
>
> Or, perhaps wrap the color in a call to rgba_to_color_index:
>
>      res at mpOceanFillColor = rgba_to_color_index((/205.,255.,255.,1.0/))
> ; note the added opacity value
>
> HTH...
> Rick
>
> On Wed, Jul 13, 2022 at 11:36 AM Andrew Kren - NOAA Federal <
> andrew.kren at noaa.gov> wrote:
>
>> Hi Rick,
>>
>> I set the ocean color as this:
>>
>> res at mpOceanFillColor = (/205.,255.,255./)
>>
>>
>> I got this error message:
>>
>> fatal:Mul: operation not supported on type (string)
>>
>>
>> Thanks!
>>
>>
>>
>> On Wed, Jul 13, 2022 at 1:30 PM Rick Brownrigg <brownrig at ucar.edu> wrote:
>>
>>> Hi Andrew,
>>>
>>> How did you try to set the ocean color, and what was the error NCL gave?
>>>
>>> Rick
>>>
>>> On Wed, Jul 13, 2022 at 10:53 AM Andrew Kren - NOAA Federal via ncl-talk
>>> <ncl-talk at mailman.ucar.edu> wrote:
>>>
>>>> Hi there,
>>>>
>>>> I have a random question. I am plotting surface smoke from the HRRR but
>>>> decided to add color to the ocean and inland water. When I plotted data for
>>>> Alaska, since the HRRR domain only extends so far, the "cyan" color I chose
>>>> ends up becoming noticeable outside the plotted region. I believe the
>>>> reason the color shade is off is because I set a fill opacity less than 1,
>>>> which makes the ocean in the plotted region lighter. See plotted image of
>>>> the discrepancy.
>>>>
>>>> My question is, is there a way to get these two to match up without
>>>> having to change the fill opacity? Alternatively, I tried to set the ocean
>>>> fill color to the RGB triplet of the lighter ocean from the contour fill,
>>>> but NCL gave an error.
>>>>
>>>> Any feedback is appreciated! Thanks.
>>>>
>>>> --
>>>>
>>>> Andrew Kren
>>>> Meteorologist
>>>> NOAA's National Weather Service
>>>> Raleigh Forecast Office
>>>> 1005 Capability Drive, Suite 300
>>>> Raleigh, North Carolina 27606
>>>> voice: 919-326-1035
>>>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>
>> --
>>
>> Andrew Kren
>> Meteorologist
>> NOAA's National Weather Service
>> Raleigh Forecast Office
>> 1005 Capability Drive, Suite 300
>> Raleigh, North Carolina 27606
>> voice: 919-326-1035
>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>
>>
>>

-- 

Andrew Kren
Meteorologist
NOAA's National Weather Service
Raleigh Forecast Office
1005 Capability Drive, Suite 300
Raleigh, North Carolina 27606
voice: 919-326-1035
mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
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