[ncl-talk] how to plot air parcel trajectories from wrf output?

[Mary Haley]

If you are talking about plotting markers on a map, then I would use
gsn_add_polymarker over a WRF map.  See the attached example, which uses
wrf_map_resources and gsn_csm_map to create a blank map using the map
projection specified on the WRF output file.

Then, some dummy lat/lon locations are generated and drawn as brown dots on
the map.

You can use any marker index in the marker index table:

http://www.ncl.ucar.edu/Document/Graphics/Images/markers.png

Or you can create your own set of markers using NhlNewMarker. This allows
you to use any character in any of NCL's font tables as a marker. See:

http://www.ncl.ucar.edu/Document/Graphics/font_tables.shtml
http://www.ncl.ucar.edu/Document/Functions/Built-in/NhlNewMarker.shtml

If you want to do a really nice 3D plot of air trajectories, I suggest
looking into using Vapor.

You can see some samples at:

https://www.vapor.ucar.edu/gallery/hurricane-sandy/hi-res


--Mary




On Sat, Jul 19, 2014 at 8:15 PM, Li Qi <liqi123sh at qq.com> wrote:

> Dear all,
> I'd like to ask how to plot selected air parcel trajectories from WRF
> model output?
>
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