CATTOPY无法显示Eckertiii投影的纬度标签

Question

Cartopy并未在简单的图中显示纬度标签。 可以设置什么以显示纬度标签？ 这些代码将创建图形，但未显示LAT标签。 如果将投影更改为Platecarree，则没有问题可以显示标签。

Python代码是：

# Setup a global EckertIII map with faint coastlines.
fig = plt.figure(figsize=(16, 8))

ax = fig.add_subplot(2,2,1, projection=ccrs.EckertIII())
# ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree())
x = np.arange(-90, 90)
y = x.copy()
x2, y2 = np.meshgrid(x, y)
z = x2*y2
filled_c = ax.contourf(x2, y2, z, transform=ccrs.PlateCarree())
line_c = ax.contour(x2, y2, z, levels=filled_c.levels,
                    colors=['black'],
                    transform=ccrs.PlateCarree())
plt.colorbar(filled_c, orientation='vertical', ax=ax)
ax.set_global()
ax.coastlines('110m', alpha=0.1)
# Use the line contours to place contour labels.
ax.clabel(
    line_c,  # Typically best results when labelling line contours.
    colors=['black'],
    manual=False,  # Automatic placement vs manual placement.
    inline=True,  # Cut the line where the label will be placed.
    fmt=' {:.0f} '.format,  # Labes as integers, with some extra space.
)
# # s0
# ax.gridlines(color='k', linestyle='--', draw_labels=True)

# # s1
gl = ax.gridlines(
    xlocs=[-180, -120, -60, 0, 60, 120, 180],
    ylocs=[-90, -60, -30, 0, 30, 60, 90],
    draw_labels=True, x_inline=False, y_inline=False,
    lw=0.5, linestyle='--', color='gray'
)
# gl.top_labels = False
# gl.right_labels = True
gl.rotate_labels = False

Answer 1

我自己解决了该数字两次的网格电话，我自己解决了问题。
第一次运行设置为旋转标签TRUE，然后将第二次运行设置为此False。
然后，将为他们绘制网格线。

 # 1st to draw the rotate labels
    gl = ax.gridlines(color='k', linestyle='--', lw=0.5, draw_labels=True)
  
    # 2nd to draw the non-rotate labels
    gl = ax.gridlines(color='k', linestyle='--', lw=0.5, draw_labels=True)
  
    gl.rotate_labels = False