如何在Python中创建一个网格字段，其中包含全局每个像素的国家名称，分辨率为0.1°x0.1°？

import numpy as np
import pandas as pd
from PIL import Image
from mpl_toolkits.basemap import Basemap

m = Basemap(llcrnrlon=-180, llcrnrlat=-90, urcrnrlon=180, urcrnrlat=90, resolution='l')

lons = np.arange(-180, 180, 0.1)
lats = np.arange(-90, 90, 0.1)
lon_grid, lat_grid = np.meshgrid(lons, lats)

x, y = m(lon_grid, lat_grid)

image = Image.new('RGB', (x.shape[1], x.shape[0]))

for i in range(x.shape[0]):
    for j in range(x.shape[1]):
        lon, lat = m(x[i, j], y[i, j], inverse=True)
        country_name = get_country_name(lon, lat)  # 自定义函数，根据经纬度获取国家名称
        image.putpixel((j, i), get_color(country_name))  # 自定义函数，根据国家名称获取颜色值

image.save('grid_image.png')