如何为带自定义彩色标记的Folium地图添加关联的线性颜色条

直接基于你已有的代码补充Branca色阶组件即可完成，完整可运行代码如下：

import folium
# Folium内置Branca组件，无需额外安装
from branca.colormap import LinearColormap

# 原有数据定义
geo_pts = [(43.613104184487966, 3.888499606480643),
 (43.62380243834923, 3.857292924347734),
 (43.59878916204914, 3.8655616117551346),
 (43.619188835688256, 3.863774797275551),
 (43.609084246467894, 3.863354463170052),
 (43.59877648226874, 3.8949413546743608),
 (43.59641535416491, 3.9004649638210434),
 (43.60835143135754, 3.868352674165506),
 (43.61140610033741, 3.895321677934005),
 (43.59707832354887, 3.8988040501915093),
 (43.59098438823383, 3.8800897856962373),
 (43.60739277101043, 3.8667832414359857),
 (43.61663960717645, 3.895544460094556),
 (43.62348570738639, 3.865234073884166),
 (43.61294571774928, 3.8914346874368637)]

col_hex=['#8000ff',
 '#5e35fe',
 '#3c68f9',
 '#1996f3',
 '#08bee9',
 '#2adddd',
 '#4df3ce',
 '#6efebe',
 '#90feab',
 '#b2f396',
 '#d4dd80',
 '#f6be68',
 '#ff964f',
 '#ff6835',
 '#ff351b']

# 原有地图初始化
fm = folium.Map(location=geo_pts[0], tiles="Stamen Terrain")

# 原有标记绘制逻辑
for num, loc in enumerate(geo_pts):
    folium.Marker(
        location=loc,
        popup="Pts" + '{:02d}'.format(num),
        icon=folium.Icon(color='white',icon_color=col_hex[num], icon="star", prefix="fa"),
    ).add_to(fm)

# 新增：生成匹配的线性色条
color_bar = LinearColormap(
    colors=col_hex,
    vmin=1,  # 左端点紫色对应数值1
    vmax=15, # 右端点红色对应数值15
    caption="点位编号映射（1-15）",
    tick_labels=[1, 5, 10, 15]  # 精简刻度，避免过密
)

# 新增：将色条挂载到地图
color_bar.add_to(fm)

# 可选：保存为本地HTML文件
# fm.save("geo_point_map.html")

关键调整说明 #

• 颜色匹配：直接复用现有col_hex列表，无需手动插值，色阶过渡与标记颜色完全一致
• 数值映射：vmin/vmax严格对应「1紫15红」的规则
• 位置自定义：色条默认在地图右下角，可通过color_bar.position = 'bottomleft'调整位置
• 离散色条切换：若需要每个色对应独立数值节点，将LinearColormap替换为branca.colormap.StepColormap，并添加index=list(range(1,16))参数即可

内容的提问来源于stack exchange，提问作者lhoupert