To display grid labels on a Southpolar stereographic map in Cartopy, you can use the Gridliner
class and set the appropriate ticklabels
and formatting options. Here is an example code snippet:
import cartopy.crs as ccrs
import matplotlib.pyplot as plt
from cartopy.mpl.gridliner import Gridliner
fig = plt.figure(figsize=(10, 10))
# Define Southpolar Stereographic projection
south_polar_stereo = ccrs.SouthPolarStereo()
# Create subplot with Southpolar Stereographic projection
ax = fig.add_subplot(1, 1, 1, projection=south_polar_stereo)
# Set extent of the plot
ax.set_extent([-180, 180, -90, -60], ccrs.PlateCarree())
# Draw coastlines
ax.coastlines(resolution='110m')
# Create Gridliner object with tick options
gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True, linestyle='--')
gl.xlabels_top = False
gl.ylabels_right = False
gl.xlabel_style = {'size': 14}
gl.ylabel_style = {'size': 14}
# Set tick formatting options
gl.xformatter = plt.FuncFormatter(lambda lon, _: '{:.0f}°E'.format(lon))
gl.yformatter = plt.FuncFormatter(lambda lat, _: '{:.0f}°S'.format(lat))
plt.show()
In this example, we create a subplot with a Southpolar Stereographic projection using add_subplot()
, and set the extent of the plot with set_extent()
. We then draw coastlines with coastlines()
.
To display grid labels, we create a Gridliner
object with gridlines()
and set the draw_labels
option to True. We also set the xlabels_top
and ylabels_right
options to False to ensure that the labels are displayed at the bottom and left of the plot. We then set the font size of the labels with xlabel_style
and ylabel_style
.
Finally, we set the formatting of the tick labels using xformatter
and yformatter
. In this example, we use a lambda function to format the labels with the degrees symbol and the appropriate direction (E for longitude and S for latitude).
The resulting plot will display latitude and longitude grid labels at the bottom and left of the plot, with tick marks and appropriate formatting.
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Asked: 2023-05-25 13:43:18 +0000
Seen: 14 times
Last updated: May 25 '23
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