(RESOLVED) plotgrids_new.ncl Draw Wrong Picture in Polar Regions

[Yang_7Ke]

Hi

I want draw a picture of Polar Stereographic range from 70°S to 90°S.
Hence, "ncl plotgrids_new.ncl" was executed in terminal.
The value of truelat1 should be set to -200, not -70. Then can I see a picture of Polar Stereographic range from 70°S to 90°S.
But, provided that I want to run geogrid.exe, the correct value is -70.

I wonder if there is a bug with respect to drawing a picture of Polar Stereographic.

 

[kwerner]

Hi,
Can you attach the namelist.wps file you are using (to run the WPS executables), and let me know which version of WPS you are using?
Thanks!

 

[Yang_7Ke]

The version of WPS is 4.0
And namelist、plotgrids_new.ncl and resulting patterns are all attached here.

 

[kwerner]

Thanks for sending those. I'm seeing the same thing you are. I'll take a look and see if I can figure out what's going on, and get back to you.

 

[mgduda]

The plot looks correct to me. With 74 x 61 grid points and a nominal grid distance of 30 km, we should expect the domain to cover about 2190 km x 1800 km ignoring map scale distortion, which is what I think the plot is showing (assuming the latitude grid is drawn every 5 degrees). If you need your model domain to cover a larger geographic area, you should increase either e_we and e_sn or dx and dy in your namelist.wps file. You might also want to take a look at these slides to understand the role of the true latitude(s) of various map projections.

 

[Yang_7Ke]

Thank you so much
I've got your idea.
The way to to cover a larger geographic area is increasing e_we , dx..., instead of changing truelat1.
Though I can get the pattern I want by changing truelat1, it won't work for executing geogrid.exe.