问题
The following code (copied from here) produces a nicely looking geodesic between NYC and New Delhi. Upon close inspection, the geodesic does not look smooth. How can I make it smooth looking?
import cartopy.crs as ccrs
import matplotlib.pyplot as plt
ny_lon, ny_lat = -75, 43
delhi_lon, delhi_lat = 77.23, 28.61
ax = plt.axes(projection=ccrs.PlateCarree())
ax.stock_img()
plt.plot([ny_lon, delhi_lon], [ny_lat, delhi_lat],
linewidth=2, marker='o', transform=ccrs.Geodetic())
plt.tight_layout()
plt.show()
回答1:
You need to set a finer threshold of the line segments along the plotted geodesic line. Here is the relevant lines of code to do so.
plateCr = ccrs.PlateCarree()
# print(plateCr._threshold) # original threshold=0.5
plateCr._threshold = plateCr._threshold/10. #set finer threshold
ax = plt.axes(projection=plateCr)
Replace the line:
ax = plt.axes(projection=ccrs.PlateCarree())
with the proposed code above. The result plot should look like this:
来源:https://stackoverflow.com/questions/60685245/plot-fine-grained-geodesic-with-cartopy