[ncl-talk] WRF Cross-section Plot - Terrain Depiction and Lowest Level Data Contours

[Scott Capps]

I modify the placement and width by passing in the lat/lon of the two
points.  I would be interested in viewing your code and can send mine as
well.

On Fri, Jan 19, 2018 at 4:22 AM, Barry Lynn <barry.h.lynn at gmail.com> wrote:

> Hi Scott:
>
> I am curious if you are able to set the cross section to appear where you
> want it, or if you are able to modify the width (cross-sectional extent)?
>
> If not, I can send you my cross-section code that does all that.
>
> Barry Lynn
>
> On Fri, Jan 19, 2018 at 1:55 AM, Bill Ladwig via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> Hi Scott,
>>
>> My first guess is that the vertical levels for interpolation are too
>> large (not your fault). The interpolation algorithm automatically chooses
>> vertical levels at .01*z_max. In your case z_max is 20251.8 m, which means
>> your interpolation levels are at 202.5 m per grid box. This is probably too
>> large for what you're interested in looking at.
>>
>> As a first attempt to fix, let's edit your WRFUserARW.ncl.
>>
>> At line 383, change this:
>>
>> dz = 0.01 * z_max
>>>
>>
>> to this:
>>
>> dz = 0.0025 * z_max
>>
>>
>> If this doesn't help your situation, I'll need to dig in to this a bit
>> more.
>>
>> Hope this helps,
>>
>> Bill
>>
>> On Thu, Jan 18, 2018 at 3:04 PM, Scott Capps via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> Greetings,
>>>
>>> I have some questions about the cross-section plots from WRF output.  I
>>> basically started from the example scripts at:
>>> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NC
>>> L/Examples/CROSS_SECTION/wrf_CrossSection_smooth4.htm
>>>
>>> The whitespace along the terrain height is much too large and the
>>> terrain is too coarse (this is a 667m resolution WRF run) or the lowest
>>> level atmospheric data is not being contoured correctly.  The cross-section
>>> plotting routine in GRaDs seems to show true the resolution of terrain and
>>> terrain following data.  Is there a way to improve this in NCL?
>>>
>>> I have attached some code (cross_sxn_plot_test.ncl and modified
>>> WRFUserARW.ncl) and have ftp'd an example wrfout file to the incoming
>>> directory as:  wrfout_d05_2017-10-09_00:00:00.nc
>>>
>>>
>>> NCL v6.3.0
>>> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Exa
>>> mples/CROSS_SECTION/wrf_CrossSection_smooth4.htm
>>>
>>> --
>>> *Scott Capps*
>>> Principal
>>> Atmospheric Data Solutions <http://www.atmosphericdatasolutions.com>
>>> scapps at atmosdatasolutions.com
>>> cell: (949) 910-4385
>>>
>>>
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>>
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>
>
> --
> Barry H. Lynn, Ph.D
> Senior 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
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>



-- 
*Scott Capps*
Principal
Atmospheric Data Solutions <http://www.atmosphericdatasolutions.com>
scapps at atmosdatasolutions.com
cell: (949) 910-4385
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