[ncl-talk] Few issues plotting vertical cross-sections with terrain mask

[Bill Ladwig]

Hi Nicholas,

One of the problems with that mountain cross section example is that there
is no vertical coordinate information set for the cross section, and this
causes all kinds of problems with the plotting (which is why it's so
hacky). First, try using the new wrf_user_vertcross that's attached (which
will be part of the next NCL release, ported from WRF-Python). Also, when
plotting with this, you should probably avoid the "wrf_" plotting routines,
as those can be difficult to control. Try plotting with the regular
"gsn_csm_" routines instead.

Hope this helps,

Bill


On Mon, Nov 5, 2018 at 10:17 AM Nicholas Thomas Luchetti <
Nicholas.Luchetti at colorado.edu> wrote:

> Hi all,
>
> I'm attempting to plot vertical cross sections of an idealized WRF
> simulation that includes a terrain mask.
>
> I've been trying to play around with NCAR's experimental
> wrf_CrossSection_add_smooth_terrain code (
> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/CROSS_SECTION/wrf_CrossSection_add_smooth_terrain.ncl
> )
>
> with decent results.
>
> However, I can't seem to figure out a few issues... First off, the lines:
>
>  ter_res = True
>
>   opts_ter = res
>
>   opts_ter at gsnYRefLine = 0.0
>
>   opts_ter at gsnAboveYRefLineColor = "black"
>
>   opts_ter at gsnDraw = False
>
>   opts_ter at gsnFrame = False
>
>   opts_ter at FieldTitle = ""
>
> don't seem to work for me... The mountain mask only appears white. No
> errors, but the mountain won't change colors to black and I'm not sure why.
>
>
> Second, the base of the terrain appears to be bumped up .2km which throws
> off my labels... I can't figure out in the code where this is happening.
> I've attached my version to this email. The terrain in this setup is a 500
> meter valley... The plots, however, appear to set up the terrain around 700
> meters, not 500 meters, so the base of the valley only dips to 200 meters,
> when it should be around 0 meters. See attached screenshot for reference.
>
> Does anyone have any ideas? Thanks!
>
> Nick Luchetti
> --
> Nicholas Luchetti
> Graduate Student
> Department of Atmospheric and Oceanic Sciences (ATOC)
> CU Boulder
>
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