Hello I am trying to render this map with Folium inside a jupyter notebook.
https://github.com/kthotav/TopoJSON-Maps/blob/master/usa/usa-states/colorado/colorado-counties.json
As this is TopoJson, it should be pretty straightforward
m = folium.Map([39, -105], zoom_start=7)
folium.TopoJson(
open('./data/colorado-counties.json'),
object_path='objects.colorado-counties'
).add_to(m)
m
This renders the base layer, but does not draw the polygons for the counties.
I found this other example on stackoverflow and it renders just fine with essentially the same code.
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
I can't find any large scale differences between the two files. Is there some topojson version incompatibility?
OK, figured it out. folium can't parse object names with -s in them. Probably a javascript translation thing?
fun test
works
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
does not work
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