在 Folium 地图上添加 1KM 网格

Question

有人可以建议一种在 folium 地图上添加 1KM 宽的网格/经纬网的方法吗？这里的 folium 示例使用纬度/经度间隔，但不渲染网格。

import folium

# Bangkok coordinates
center_lat = 13.7563
center_lon = 100.4911

m = folium.Map(location=[center_lat, center_lon], zoom_start=11)


# Interval in degrees (1 kilometer ≈ 0.00694444 degrees)
interval = 0.00694444

# Create grid lines
grid_lines = []

# East-west lines (from -90 to 90 latitude)
for lat in range(-90, 91, int(1 / interval)):
  west_point = (-180, lat)
  east_point = (180, lat)
  grid_lines.append(folium.PolyLine([west_point, east_point], color="black", weight=0.5, opacity=0.5))

# North-south lines (from -180 to 180 longitude)
for lon in range(-180, 181, int(1 / interval)):
  south_point = (lon, -90)
  north_point = (lon, 90)
  grid_lines.append(folium.PolyLine([south_point, north_point], color="black", weight=0.5, opacity=0.5))

# Add lines to the map
for line in grid_lines:
  line.add_to(m)

# Display the map
m

Answer 1

您的 grid 实际上会在 上渲染，但它并不像您预期的那样，因为您使用的是

range

而不是

numpy.arange

。此外，您还反转了两个 for 循环中每个

PolyLine

的位置。所以，这是一个可能的修复方法：

import folium
import numpy as np

CLAT, CLON = 13.7563, 100.4911

m = folium.Map(location=[CLAT, CLON], zoom_start=11)

INTERVAL = 1 / 111  # 1 km to degrees, gives ~0.009

LINE_STYLE = {"color": "black", "weight": 0.5, "opacity": 0.5}

def add_gl(m, s, e, hztl, **kwargs):
    for v in np.arange(s, e + 1, INTERVAL):
        coords = [[v, -180], [v, 180]] if hztl else [[-90, v], [90, v]]
        folium.PolyLine(coords, **kwargs).add_to(m)

add_gl(m, -90, 90, hztl=True, **LINE_STYLE)
add_gl(m, -180, 180, hztl=False, **LINE_STYLE)

NB：地图在我的 JupyterLab 上显示大约需要 40 秒，而且导航相对麻烦/缓慢。

输出（

m

）：