python - 使用 basemap 绘制经线和纬线

Question

我有点卡在这上面了。我想使用以下代码在 map 上绘制经线和纬线:

import numpy as np
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt


# creates an object called map which can plot various things on different projections

plt.figure(figsize=(7,6))
map = Basemap(projection='cyl',llcrnrlat=50.,urcrnrlat=59.,\
        llcrnrlon=-7.5,urcrnrlon=3,resolution='l')

map.drawmapboundary()  
map.drawcoastlines()

# draw grid plots
map.drawparallels(np.arange(-7.0,2.0,1.0),labels=[1,0,0,0]) #longigtude
map.drawmeridians(np.arange(51.0,58.0,1.0),labels=[0,0,0,1]) #latitude 

# make image bigger:
plt.show()

该图工作正常，但没有网格线。有什么想法吗？

Answer 1

您的经线和纬线不适合感兴趣的区域。你的平行线必须是你的经络(你在代码中打印错误):

# draw grid plots
map.drawmeridians(np.arange(-7.0,2.0,1.0),labels=[1,0,0,0]) #longitudes
map.drawparallels(np.arange(51.0,58.0,1.0),labels=[0,0,0,1]) #latitudes