OSMnx plot_figure_ground中新增street_widths的highway值未显示问题

问题描述 #

在使用osmnx.plot.plot_figure_ground函数时，为street_widths字典添加的highway键值对未在生成的地图中生效。例如已配置"residential": 0.25，但OSM中标记为residential的道路（红线标注）在输出地图中并未应用该宽度设置。

配置的street_widths字典 #

street_widths = {
"motorway": 0.75,
"motorway_link": 0.75,
"trunk": 0.5,
"trunk_link": 0.5,
"primary": 0.5,
"primary_link": 0.5,
"secondary": 0.25,
"secondary_link": 0.25,
"tertiary": 0.25,
"tertiary_link": 0.25,
"unclassified": 0.25,
"residential": 0.25,
"living_street": 0.25,
"service": 0.1,
"pedestrian": 0.1,
"track": 0.1,
"footway": 0.1,
"steps": 0.1,
"path": 0.1,
}

输出与验证 #

• 地图输出结果：
  
• OSM道路类型查询：红线标注道路为residential类型
  

测试代码 #

import osmnx as ox

ox.settings.log_console=True
ox.settings.use_cache=False

street_widths = {
    "motorway": 0.75,
    "motorway_link": 0.75,
    "trunk": 0.5,
    "trunk_link": 0.5,
    "primary": 0.5,
    "primary_link": 0.5,
    "secondary": 0.25,
    "secondary_link": 0.25,
    "tertiary": 0.25,
    "tertiary_link": 0.25,
    "unclassified": 0.25,
    "residential": 0.25,
    "living_street": 0.25,
    "service": 0.1,
    "pedestrian": 0.1,
    "track": 0.1,
    "footway": 0.1,
    "steps": 0.1,
    "path": 0.1,
    }

land_tags = {
    'building': True
    }

bgcolor="#343434"
edge_color="#FFFFFF"
bldg_color="#FF0000"

place="sd"
point=(32.7362, -117.1129)
dist=8000
dpi=1000

# Helper function to get square street networks, building footprints, and plot them
def make_plot(place, point, dist=dist, dpi=dpi, network_type='all', default_width=0.25,
                street_widths=street_widths):

    # Get bounding box
    bbox = ox.utils_geo.bbox_from_point(point, dist=dist)
    # Get land features using land_tags dictionary
    land = ox.geometries.geometries_from_point(center_point=point, tags=land_tags, dist=dist)
    # Plot figure-ground diadram of streets
    fig, ax = ox.plot.plot_figure_ground(point=point, dist=dist, network_type=network_type,
                                    default_width=default_width, street_widths=street_widths,
                                    edge_color=edge_color, save=False, show=False, close=True, bgcolor=bgcolor)

    # Plot land footprint
    fig, ax = ox.plot.plot_footprints(land, ax=ax, color=bldg_color, bbox=bbox, dpi=dpi,
                                save=True, show=False, close=True,
                                filepath="{}-dist{}-dpi{}.png".format(place,dist,dpi))

make_plot(place, point, dist)

原因分析与解决方法 #

1. 复合highway标签不匹配 #

OSM中部分道路的highway属性是列表类型（例如['residential', 'service']），而street_widths仅匹配单个字符串类型的键，导致这类道路会 fallback 到default_width。

解决方法：预处理路网，将复合标签转为单个主类型：

def make_plot(place, point, dist=dist, dpi=dpi, network_type='all', default_width=0.25,
                street_widths=street_widths):

    # 先获取路网并处理复合highway标签
    G = ox.graph_from_point(point, dist=dist, network_type=network_type)
    for u, v, k, data in G.edges(data=True, keys=True):
        if isinstance(data['highway'], list):
            # 取列表第一个元素作为主道路类型
            data['highway'] = data['highway'][0]
    
    # 使用处理后的路网绘图，替代plot_figure_ground的默认获取逻辑
    fig, ax = ox.plot.plot_graph(G, node_size=0, 
                                 edge_color=edge_color, 
                                 edge_width=ox.plot.get_edge_widths(G, street_widths=street_widths, default_width=default_width),
                                 bgcolor=bgcolor, save=False, show=False, close=True)

    # 后续绘制建筑代码不变
    bbox = ox.utils_geo.bbox_from_point(point, dist=dist)
    land = ox.geometries.geometries_from_point(center_point=point, tags=land_tags, dist=dist)
    fig, ax = ox.plot.plot_footprints(land, ax=ax, color=bldg_color, bbox=bbox, dpi=dpi,
                                save=True, show=False, close=True,
                                filepath="{}-dist{}-dpi{}.png".format(place,dist,dpi))

2. 验证道路类型是否匹配 #

先打印路网中实际存在的highway类型，确认street_widths是否覆盖所有需要的类型：

# 在make_plot函数中添加
G = ox.graph_from_point(point, dist=dist, network_type=network_type)
edges = ox.utils_graph.get_edges(G)
print("实际道路类型：", edges['highway'].unique())

如果输出中有未在street_widths中定义的类型（包括复合字符串如residential;service），需要将这些类型也添加到字典中。

3. 版本兼容性问题 #

你使用的是OSMnx v0.16.0的示例代码，旧版本对street_widths的匹配逻辑可能存在局限。建议升级OSMnx到最新稳定版，或查看对应版本的plot_figure_ground源码确认宽度匹配逻辑。

4. 参数传递确认 #

确保street_widths参数正确传递到plot_figure_ground或get_edge_widths函数中，避免因变量作用域问题导致配置未生效。

内容的提问来源于stack exchange，提问作者tykom