ValueError: A non-empty list of tiles should be provided to merge

Question

谁能帮我找出使用 cartopy 时出现的错误消息？

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid.inset_locator import inset_axes
import cartopy.crs as ccrs
import cartopy.io.img_tiles as cimgt

import windrose

ws = np.random.random(500) * 6
wd = np.random.random(500) * 360

minlon, maxlon, minlat, maxlat = (6.5, 7.0, 45.85, 46.05)

proj = ccrs.PlateCarree()
fig = plt.figure(figsize=(12, 6))
# Draw main ax on top of which we will add windroses
main_ax = fig.add_subplot(1, 1, 1, projection=proj)
main_ax.set_extent([minlon, maxlon, minlat, maxlat], crs=proj)
main_ax.gridlines(draw_labels=True)
main_ax.coastlines()

request = cimgt.OSM()
main_ax.add_image(request, 12)

我收到的错误是 ValueError: A non-empty list of tiles should be provided to merge. 似乎无法弄清楚问题是什么。

Answer 1

您的请求被 OSM 服务器拒绝。要绕过它，您需要使用 image_spoof() 作为演示在这个 link.

有了image_spoof()，您的相关代码应该是：-

# reformat web request for street map spoofing
cimgt.OSM.get_image = image_spoof
# continued with your code
request = cimgt.OSM() # spoofed

ValueError: A non-empty list of tiles should be provided to merge

ValueError: A non-empty list of tiles should be provided to merge

python

openstreetmap

cartopy