[ncl-talk] Grainy image

[Tim Risner]

Puzzles for good reason Mary.
The data set was changed over night on the back end without me knowing, so
I was plotting slightly different data, so I guess that agrees with the
issue being in the data set.
My apologies for the confusion.

*Tim Risner*
*Operational Meteorologist*
*(888) 798-9955 ext 1006*

<http://www.awis.com>[image: https://www.facebook.com/AWISWeatherServices/]
<https://www.facebook.com/AWISWeatherServices/>
<https://twitter.com/awisweather>


On Fri, Jan 11, 2019 at 9:02 AM Mary Haley <haley at ucar.edu> wrote:

> Hi Tim,
>
> I'm a little puzzled as to how changing the resolution of the map outlines
> would affect the smoothness of the contours. Out of curiosity, could you
> send the new image? You can send it to me directly if you want.
>
> Thanks,
>
> --Mary
>
>
> On Fri, Jan 11, 2019 at 6:37 AM Tim Risner <trisner at awis.com> wrote:
>
>> Easiest solution beyond manipulating data is setting the mpDataResolution
>> to "FinestResolution"
>> This gets rid of most of the graininess, as well as smooths the
>> RasterFill a little more.
>>
>> *Tim Risner*
>> *Operational Meteorologist*
>> *(888) 798-9955 ext 1006*
>>
>> <http://www.awis.com>[image:
>> https://www.facebook.com/AWISWeatherServices/]
>> <https://www.facebook.com/AWISWeatherServices/>
>> <https://twitter.com/awisweather>
>>
>>
>> On Thu, Jan 10, 2019 at 1:01 PM Tim Risner <trisner at awis.com> wrote:
>>
>>> Thanks Mary and Rick. I'll work with the examples you mentioned and see
>>> what I can do to correct it.
>>>
>>> Attached is a google maps image showing the data and placement, to
>>> answer your questions.
>>>
>>>
>>>
>>> *Tim Risner*
>>> *Operational Meteorologist*
>>> *(888) 798-9955 ext 1006*
>>>
>>> <http://www.awis.com>[image:
>>> https://www.facebook.com/AWISWeatherServices/]
>>> <https://www.facebook.com/AWISWeatherServices/>
>>> <https://twitter.com/awisweather>
>>>
>>>
>>> On Thu, Jan 10, 2019 at 11:32 AM Mary Haley <haley at ucar.edu> wrote:
>>>
>>>> Hi Tim,
>>>>
>>>> I echo what Rick says about not being certain without seeing the data.
>>>>
>>>> Is your data a set of random points, or on a gridded structure, or
>>>> something else? If it's on a gridded structure, then what happens if you
>>>> don't set trGridType at all?
>>>>
>>>> I'm also interested to know the structure of your lat/lon data and how
>>>> dense the values are. Does your data contain any missing values? I don't
>>>> think this is the issue here, but it is important to be aware of this.
>>>>
>>>> One thing I like to do for problem plots like this is to zoom in on the
>>>> area with the problem, and then plot dots where the lat/lon locations are
>>>> just to see if there's anything going on with regard to the density of the
>>>> locations and/or potential missing values.
>>>>
>>>> If you look at this page:
>>>>
>>>> http://www.ncl.ucar.edu/Applications/datagrid.shtml
>>>>
>>>> you will see some examples of using gsn_coordinates to plot the lat/lon
>>>> locations of your data, and also use different colors for where the data is
>>>> missing or not.
>>>>
>>>> In particular, datagrid_6.ncl might be useful if you have curvilinear
>>>> data.
>>>>
>>>> http://www.ncl.ucar.edu/Applications/datagrid.shtml#ex6
>>>>
>>>> If you have random data, then contour1d.ncl on the same same might be
>>>> useful.
>>>>
>>>> --Mary
>>>>
>>>>
>>>> On Thu, Jan 10, 2019 at 10:07 AM Rick Brownrigg <brownrig at ucar.edu>
>>>> wrote:
>>>>
>>>>> Hi Tim,
>>>>>
>>>>> I don't know for certain without looking at the data, but I have to
>>>>> imagine its manifest in the data itself, and that in those regions you
>>>>> mentioned the probability is hovering right around 50%.  The color contrast
>>>>> between 40% and 50% is rather abrupt, relative to the rest of the
>>>>> successive colors, which I think draws attention to the fluctuations. There
>>>>> also appears to be similar fluctuations going on in Montana and Minnesota,
>>>>> but its harder to see because those colors "closer" to each other,
>>>>> perceptually.
>>>>>
>>>>> FWIW...
>>>>> Rick
>>>>>
>>>>>
>>>>> On Thu, Jan 10, 2019 at 9:52 AM Tim Risner <trisner at awis.com> wrote:
>>>>>
>>>>>> I'm curious as to what may be causing a grainy section in Central
>>>>>> Mississippi and SE Ohio of the attached image.
>>>>>> I'm using "RasterFill" and cnRasterSmoothingOn is set to True.
>>>>>> trGridType of all types causes it.
>>>>>> Data is pretty uniform in those regions.
>>>>>>
>>>>>>
>>>>>> *Tim Risner*
>>>>>> *Operational Meteorologist*
>>>>>> *(888) 798-9955 ext 1006*
>>>>>>
>>>>>> <http://www.awis.com>[image:
>>>>>> https://www.facebook.com/AWISWeatherServices/]
>>>>>> <https://www.facebook.com/AWISWeatherServices/>
>>>>>> <https://twitter.com/awisweather>
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