[ncl-talk] How to add topography in a "transect" cross section

[Lyndz]

Hi Jonathan,

The input file that I sent is from the post processed output of ICTP-RegCM.
I have already converted the raw output from sigma to pressure levels.


Sincerely,
Lyndz

On Fri, Oct 16, 2020 at 2:51 PM Buzan, Jonathan <jbuzan at purdue.edu> wrote:

> Hello Lyndz,
>
> From a quick glance, it looks like you did not transform your data from
> the original model coordinate system into pressure coordinates. A hybrid
> coordinate system is terrain following, so no topographic features will
> show up in your plots. This coordinate system is not true height in
> pressure or meters, but a hybrid.
> If you are using CAM, you might want to try this function:
> http://www.ncl.ucar.edu/Document/Functions/Built-in/vinth2p.shtml
> "Interpolates CAM (Community Atmosphere Model) hybrid coordinates to
> pressure coordinates.”
>
> Cheers,
> -Jonathan
>
>
>
>
> On Oct 16, 2020, at 8:43 AM, Lyndz via ncl-talk <ncl-talk at mailman.ucar.edu>
> wrote:
>
> Dear NCL experts,
>
> *Problem:*
> I am plotting a cross section along two lat-lon points using the transect
> example in NCL. My input file has no topography nor hgt variable. I want to
> mask the topography since the transect crosses an Island.
> Any suggestions on how I can do this in NCL?
>
>
> *Here's my input file:*
>
> https://www.dropbox.com/s/wt1q4wwnjrg4nvo/q_ein75-RegCM_1998-2005_DJF_1.nc?dl=0
>
>
> *What I have so far:*
> Attached are the script and output images.
>
>
> I'll appreciate any help on this matter.
>
> Sincerely,
> Lyndz
> <q_trans_ein75-RegCM_DJF.000002.png><q_trans_ein75-RegCM_DJF.000001.png>
> <transect_q_ein75-RegCM.ncl>
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