[ncl-talk] About mesh range of lon lat plot.

[David Brown]

I would like to add a bit to Mary's description. A Raster-filled plot can
work 2 different ways depending on the setting of the resource
"cnRasterSmoothingOn". If cnRasterSmoothing is set False (the default),
 then the color assigned will depend on the value associated with the grid
box or boxes that occupy the most area around the data value. Note that
depending on the raster resolution there can be less than one or more than
one data value contained in a single raster cell.
If cnRasterSmoothing on is set True then the value associated with a raster
cell is calculated as a area-weighted average of all the data values within
the cell. Then the color is determined by where this value falls within the
array of contour levels setup by the user.
 -dave


On Fri, Nov 11, 2016 at 9:12 AM, Mary Haley <haley at ucar.edu> wrote:

> Tao,
>
> Please see attached script and image.  This shows what a raster plot is
> doing.  NCL constructs a box around each data value, and whatever range of
> your contour levels this data value falls in, the box will be filled in
> that color.
>
> The dots in the image show the X,Y locations of the data, which you can
> see are centered in the box that NCL constructs.  The values show the
> actual value of that data point.
>
> --Mary
>
>
> On Fri, Nov 11, 2016 at 2:04 AM, Tao Lu <hakufu.asano at gmail.com> wrote:
>
>> Hello ncl-talk
>>
>> When I plot raster contour, I have the data(nlon,nlat).
>>
>> [image: Inline image 1]
>> When I have one point data (red point), which color will be used to fill
>> color?
>> Does raster fill work when if I have a varied delta lon or delta lat?
>>
>> Thank you
>> Tao
>>
>> --
>> ******************************************************
>> Tao Lu    (M. Eng)
>> Laboratory of River Engineering and Hydrology,
>> Dept. of Civil and Environmental Engineering,
>> Graduate School of Science and Engineering,
>> Chuo University
>>
>> 1-13-27,Kasuga,Bunkyo-ku,Tokyo
>> 112-8551, Japan
>> TEL: 03-3817-1805;   Phone: 070-2188-7509
>> Email1: hakufu.asano at gmail.com <mail%3Amet.yamos at gmail.com>
>> Email2: lutao at civil.chuo-u.ac.jp <mail%3Ayamoto at civil.chuo-u.ac.jp>
>> *****************************************************
>>
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