Print a line/multiline in a new layer over a map using Folium

Question

I have tried Python folium library with impressive results, but there is one feature I am missing, or in any case I can't find: I want to print a multiline in a new layer over the map.

If I check de documentation, I can only find how to add markers and poligon markers. But about printing in a new layer, I can only find examples like this one.

I need something much simplier than that. I guess I could insert a GeoJSON with the multiline info in a similar way, but I haven't been able to even find which format should that GeoJSON have.

Any idea for getting my multiline?

PD: If you don't know how to achieve this using Python/Folium, I will be happy to hear what should I add to the Javascript output to get the multiline using Leaflet (that's what Folium library is using).

score 14 · Answer 1 · edited Mar 11 '21 at 13:00

Some of the functions in the earlier example are now deprecated; apparently, the preferred method is now something like:

import folium

# Coordinates are 10 points on the great circle from Boston to
# San Francisco.
# Reference: http://williams.best.vwh.net/avform.htm#Intermediate
coordinates = [
    [42.3581, -71.0636],
    [42.82995815, -74.78991444],
    [43.17929819, -78.56603306],
    [43.40320216, -82.37774519],
    [43.49975489, -86.20965845],
    [41.4338549, -108.74485069],
    [40.67471747, -112.29609954],
    [39.8093434, -115.76190821],
    [38.84352776, -119.13665678],
    [37.7833, -122.4167]]

# Create the map and add the line
m = folium.Map(location=[41.9, -97.3], zoom_start=4)
my_PolyLine=folium.PolyLine(locations=coordinates,weight=5)
m.add_child(my_PolyLine)
# m.save('line_example_newer.html')

As of June 2016, the PolyLine method appears to be deprecated, and the .line() method used by Roman Rdgz works. Use his example. — emunsing, Jun 10 '16 at 23:13
@emunsing Quite the opposite no ? Running the example, I get `line` is deprecated. — Overdrivr, Oct 11 '16 at 16:01

score 8 · Accepted Answer · answered May 28 '14 at 11:18

8

I finally found a way implemented in Folium in January 2014 and not documented. Its the line method.

Here appears an example provided by the author of this addon.

answered May 28 '14 at 11:18

Roman Rdgz

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It would be great if you could submit a pull request and fill the documentation, I was also lost! – cd98 Jul 23 '14 at 02:46
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`line` does not appear to be a method in Folium 0.11. – Ben Oct 22 '20 at 00:36

score 3 · Answer 3 · edited Oct 22 '20 at 00:51

3

Neither of the above worked for me for adding lines as a new layer to a folium.Map object (using folium 0.11). What works for me is using folium.FeatureGroup:

coords = [[[42.3554025, -71.0728116], [42.3554142, -71.0728438]],
 [[42.3554142, -71.0728438], [42.3554296, -71.0728738]]]
test_map = folium.Map([42.3554025, -71.0728116], tiles='Cartodb Positron', zoom_start=15)
fg = folium.FeatureGroup("Lines")
folium.PolyLine(coords).add_to(fg)
f.add_to(test_map)
folium.LayerControl(position='bottomright').add_to(test_map)
test_map

This prints a map that has a "Lines" layer which, when toggled, will show the lines plotted at the coordinates above.

edited Oct 22 '20 at 00:51

Dharman

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answered Oct 22 '20 at 00:45

Ben

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upvote from my side : D thanks! Any idea of how I could turn the connected dots into a different color? (eg: keep the lines connecting the dots blue, but make the dots themselves red, for example) – M.Ionut Apr 18 '22 at 21:10
1

I think this might be a Folium/Leaflet parameter. Check [Folium docs](https://python-visualization.github.io/folium/modules.html#folium.vector_layers.PolyLine), has a set of kwargs that inherit from [Leaflet](https://leafletjs.com/SlavaUkraini/reference-1.6.0.html#polyline). I haven't tried, but it seems like you could mess with those parameters for color. – Ben Apr 22 '22 at 21:18

Print a line/multiline in a new layer over a map using Folium

3 Answers3