Latitude/Longitude ticks not appearing when using projection=ccrs.SouthPolarStereo() in hvplot.quadmesh

hvPlot
1

Dear all,

I’ve encountered an issue when plotting global gridded data with hvPlot using a Cartopy projection:
When I use the PlateCarree projection, longitude and latitude ticks do appear correctly.
However, when I switch to SouthPolarStereo, all the ticks disappear — even though the data and code are otherwise identical.

Here is a minimal reproducible example:

import xarray as xr
import hvplot.xarray
import cartopy.crs as ccrs
import geoviews as gv

# Dummy data (you can use any global dataset)
lat = xr.DataArray(range(-90, -30), dims='latitude')
lon = xr.DataArray(range(-180, 181), dims='longitude')
data = xr.DataArray(
    lat**2 + lon**2,
    dims=('latitude', 'longitude'),
    coords={'latitude': lat, 'longitude': lon},
)

# --- Works fine: ticks visible ---
mld = data.hvplot.quadmesh(
    x='longitude', y='latitude',
    geo=True, coastline=True,
    projection=ccrs.PlateCarree(),
    cmap='YlGnBu', xlabel='Longitude', ylabel='Latitude'
)

(mld * gv.feature.grid()).opts(show_grid=False)

# --- Problem: no ticks ---
mld = data.hvplot.quadmesh(
    x='longitude', y='latitude',
    geo=True, coastline=True,
    projection=ccrs.SouthPolarStereo(),
    cmap='YlGnBu', 
    xlabel='Longitude', ylabel='Latitude'
)

(mld * gv.feature.grid()).opts(show_grid=False)
  • hvplot version: 0.12.1
  • geoviews version: 1.14.1
  • cartopy version: 0.25.0
2

I don’t think Bokeh supports ticks on these projections which is why it was disabled.