[ncl-talk] Missing values mapping as black

[Barry Lynn]

Yes, you are correct. As I mentioned, I turned off contouring and the
problem went away.

Barry

On Wed, Feb 19, 2020 at 3:02 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi,
>
> Looking at that plot, it looks almost as though some sort of line work,
> such as contour lines, is being drawn and obscuring the underlying filled
> areas (?)  I know that shouldn't be the case, because the docs for
> cnLinesOn state:
>
>    "Default: True (False for gsn_csm contour
> <http://ncl.ucar.edu/Document/Graphics/Interfaces/> routines when contour
> fill is turned on.)"
>
> but that's what it *looks* like..
>
> FWIW...
> RIck
>
>
> On Wed, Feb 19, 2020 at 12:55 AM Rashed Mahmood via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> Hi Barry,
>> I think the problem is setting this resource "res at cnFillColors" while
>> not setting cnFillPalette/*cnSpanFillPalette, see the docs for
>> cnFillColors. *I think using res at cnFillPalette = cmap, should be a
>> better choice than res at cnFillColors.
>>
>> Cheers,
>> Rashed
>>
>> On Wed, Feb 19, 2020 at 8:29 AM Barry Lynn via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> Actually, they may not be mapping as black.  I removed some more data
>>> and it became white.  However, something is mapping as black and I am not
>>> sure what it might be.
>>>
>>> On Wed, Feb 19, 2020 at 8:28 AM Barry Lynn <barry.h.lynn at gmail.com>
>>> wrote:
>>>
>>>> Hello:
>>>>
>>>> I added explicit labels to my color bar, as well as specifying the
>>>> colors I want. I added some geographical information for the map background.
>>>>
>>>>  Yet, I seem  to have a number of black squares, even though I set
>>>> missing values for all radar data less than 5 dbZ and I set
>>>>
>>>> res_ct at cnMissingValFillColor = "white" (or cmap (0,:)).
>>>>
>>>> as suggested on NCL-TALK.
>>>>
>>>> I tried both settings.
>>>>
>>>> I am not sure where the black squares are coming from.
>>>>
>>>> Thank you.
>>>>
>>>> On Tue, Feb 18, 2020 at 6:12 PM Barry Lynn <barry.h.lynn at gmail.com>
>>>> wrote:
>>>>
>>>>> Hello:
>>>>>
>>>>> For users who need to plot rectilinear data, I have attached the data
>>>>> and an ncl program to do so.
>>>>>
>>>>> Based on the NCL support pages, I was able to quickly put together the
>>>>> steps required to plot this data, including providing the data a long name,
>>>>> units, and coordinates. I also set the limits of the map over which to plot
>>>>> the data.
>>>>>
>>>>> I also created the latitude and longitude arrays from their starting
>>>>> and end points, and even reversed the latitudinal data since it was north
>>>>> to south instead of south to north.
>>>>>
>>>>> In other words, here's an easy template for doing everything you need
>>>>> to do to plot such data.
>>>>>
>>>>> I hope it helps someone...
>>>>>
>>>>> Barry
>>>>> --
>>>>> Barry H. Lynn, Ph.D
>>>>> Senior Associate Scientist, Lecturer,
>>>>> The Institute of the Earth Science,
>>>>> The Hebrew University of Jerusalem,
>>>>> Givat Ram, Jerusalem 91904, Israel
>>>>> Tel: 972 547 231 170
>>>>> Fax: (972)-25662581
>>>>>
>>>>> C.E.O, Weather It Is, LTD
>>>>> Weather and Climate Focus
>>>>> http://weather-it-is.com
>>>>> Jerusalem, Israel
>>>>> Local: 02 930 9525
>>>>> Cell: 054 7 231 170
>>>>> Int-IS: x972 2 930 9525
>>>>>
>>>>>
>>>>
>>>> --
>>>> Barry H. Lynn, Ph.D
>>>> Senior Associate Scientist, Lecturer,
>>>> The Institute of the Earth Science,
>>>> The Hebrew University of Jerusalem,
>>>> Givat Ram, Jerusalem 91904, Israel
>>>> Tel: 972 547 231 170
>>>> Fax: (972)-25662581
>>>>
>>>> C.E.O, Weather It Is, LTD
>>>> Weather and Climate Focus
>>>> http://weather-it-is.com
>>>> Jerusalem, Israel
>>>> Local: 02 930 9525
>>>> Cell: 054 7 231 170
>>>> Int-IS: x972 2 930 9525
>>>>
>>>>
>>>
>>> --
>>> Barry H. Lynn, Ph.D
>>> Senior Associate Scientist, Lecturer,
>>> The Institute of the Earth Science,
>>> The Hebrew University of Jerusalem,
>>> Givat Ram, Jerusalem 91904, Israel
>>> Tel: 972 547 231 170
>>> Fax: (972)-25662581
>>>
>>> C.E.O, Weather It Is, LTD
>>> Weather and Climate Focus
>>> http://weather-it-is.com
>>> Jerusalem, Israel
>>> Local: 02 930 9525
>>> Cell: 054 7 231 170
>>> Int-IS: x972 2 930 9525
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>> _______________________________________________
>> ncl-talk mailing list
>> ncl-talk at ucar.edu
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>

-- 
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200219/c242fcb7/attachment.html>