英文:
Trying to use the OSMnx tag "element_type" to retrieve all the "way" objects contained within a polygon
问题
我尝试通过调用标签"element_type":"way"来获取包含在一个多边形中的所有结构（多边形），但似乎无法使其工作。
我尝试了下面的代码来尝试获取多边形内的所有element_type:way，但它返回一个空的gdf。
polygon = disolved_ellipses_gpd.iloc[0]["geometry"]
tags = {"element_type":"way"}
new_gdf = ox.geometries_from_polygon(polygon, tags)
new_gdf.shape
我还尝试了这段代码，试图仅筛选掉非element_type:way，但我收到了一个KeyError："element_type"。
polygon = disolved_ellipses_gpd.iloc[0]["geometry"]
tags = {"building":True}
new_gdf = ox.geometries_from_polygon(polygon, tags)
new_gdf.shape
new_gdf[new_gdf["element_type"] == "way"].dropna(axis=1, how="any")
我不确定是我在某个地方搞砸了，还是你只是无法基于"element_type"来调用。我尝试搜索文档，但找不到任何信息。
英文:
I'm trying to get all the structures (polygons) contained within a set polygon by calling for the tag "element_type":"way" but I can't seem to get it to work.
I've tried the code below to try to get all the element_type:way inside the polygon but it returns an empty gdf.
polygon = disolved_ellipses_gpd.iloc[0]["geometry"]
tags = {"element_type":"way"}
new_gdf = ox.geometries_from_polygon(polygon, tags)
new_gdf.shape
I also tried this code in an attempt to just filter out the non element_type:way but I get a KeyError: "element_type".
polygon = disolved_ellipses_gpd.iloc[0]["geometry"]
tags = {"building":True}
new_gdf = ox.geometries_from_polygon(polygon, tags)
new_gdf.shape
new_gdf[new_gdf["element_type"] == "way"].dropna(axis=1, how="any")
I'm not sure if I'm screwed up somewhere or if you just can't call based on the "element_type". I tried searching through the documentation but couldn't find anything.
答案1
得分: 1
There is almost certainly a better way, but I blundered into this solution:
gdf = ox.geometries_from_point((lat, lon), dist=distance, tags=tags)
print(len(gdf)) # 返回行数?
# 尝试提取OSM ID - 令人惊讶地困难
element_type = gdf.axes[0].values[0][0]
osmid = gdf.axes[0].values[0][1]
For some reason, this syntax simply fails:
gdf['element_type']
Perhaps @gboeing may offer a better solution.
英文:
There is almost certainly a better way, but I blundered into this solution:
gdf = ox.geometries_from_point( (lat, lon), dist=distance, tags=tags)
print ( len ( gdf ) ) # Returns the number of rows?
# Try to extract the OSM ID - surprisingly diffculty
element_type = gdf.axes[0].values[0][0]
osmid = gdf.axes[0].values[0][1]
For some reason, this syntax simply fails:
gdf [ 'element_type' ]
Perhaps @gboeing may offer a better solution.
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