Highlighting a single ll_to_xy grid point + showing all grid points on WRF map

Hi everyone,

I’m trying to highlight a single grid point on a WRF map. Plotting by lat/lon works fine:

ax = plt.axes(projection=cart_proj)
ax.plot(lon_value,
lat_value,
color="red",
marker="o",
markersize=3,
transform=ccrs.PlateCarree()
)


But when I convert the same location using:

xy_mmh = ll_to_xy(wrf_in, lat_value, lon_value)

I’m not sure how to plot only this grid‑index point on the map.
What is the correct way to display the point returned by ll_to_xy?


My second question:
How can I show all grid points on the map (e.g., a surface plot of terrain height with the full grid overlaid)?

There’s no need for full scripts — just the specific commands for each task would be greatly appreciated.

Hopefully my questions are clear — I’d appreciate answers to these two parts separately.


Best regards,
 
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