Python Folium Topojson文件无法渲染

Question

你好我想在一个jupyter笔记本中用Folium渲染这个地图。

https://github.com/kthotav/TopoJSON-Maps/blob/master/usa/usa-states/colorado/colorado-counties.json

由于这是TopoJson，它应该非常简单

m = folium.Map([39, -105], zoom_start=7)
folium.TopoJson(
    open('./data/colorado-counties.json'),
    object_path='objects.colorado-counties'
).add_to(m)
m

这将渲染基础图层，但不会为县绘制多边形。

我找到了this other example on stackoverflow，它使用基本相同的代码渲染得很好。

m = folium.Map(location=[40.7,-74], zoom_start=10)
folium.TopoJson(
    open('./data/nyc_census_tracts_2010.geojson'),
    object_path='objects.nyct2010',
).add_to(m)
m

我找不到两个文件之间的任何大规模差异。是否有一些topojson版本不兼容？

Answer 1

好吧，想通了。 folium无法使用-s解析对象名称。可能是一个javascript翻译的东西？

有趣的测试

作品

m = folium.Map([0, 0], zoom_start=7)
folium.TopoJson(
    {
      "type":"Topology",
      "transform":{
        "scale": [1,1],
        "translate": [0,0]
      },
      "objects":{ 
        "two_squares":{
          "type": "GeometryCollection",
          "geometries":[
            {"type": "Polygon", "arcs":[[0,1]],"properties": {"name": "Left_Polygon" }},
            {"type": "Polygon", "arcs":[[2,-1]],"properties": {"name": "Right_Polygon" }}
          ]
        }
      },
      "arcs": [
        [[1,2],[0,-2]],
        [[1,0],[-1,0],[0,2],[1,0]],
        [[1,2],[1,0],[0,-2],[-1,0]]
      ]
    },
    object_path='objects.two_squares'
).add_to(m)
m

不起作用

m = folium.Map([0, 0], zoom_start=7)
folium.TopoJson(
    {
      "type":"Topology",
      "transform":{
        "scale": [1,1],
        "translate": [0,0]
      },
      "objects":{ 
        "two-squares":{
          "type": "GeometryCollection",
          "geometries":[
            {"type": "Polygon", "arcs":[[0,1]],"properties": {"name": "Left_Polygon" }},
            {"type": "Polygon", "arcs":[[2,-1]],"properties": {"name": "Right_Polygon" }}
          ]
        }
      },
      "arcs": [
        [[1,2],[0,-2]],
        [[1,0],[-1,0],[0,2],[1,0]],
        [[1,2],[1,0],[0,-2],[-1,0]]
      ]
    },
    object_path='objects.two-squares'
).add_to(m)
m