Folium map not displaying

问题

Running on canopy version 1.5.5.3123 With;

Folium Version: 0.1.2, Build: 1

The following code;

import folium  
import pandas as pd
LDN_COORDINATES = (51.5074, 0.1278)  
from IPython.display import HTML
import shapefile
#create empty map zoomed in on London
LDN_COORDINATES = (51.5074, 0.1278) 
map = folium.Map(location=LDN_COORDINATES, zoom_start=12)
display(map)

Returns

<folium.folium.Map at 0x10c01ae10>

But nothing else.

How do i get to display a map within an ipython notebook?

回答1:

I've found this tutorial on Folium in iPython Notebooks quite helpful. The raw Folium instance that you've created isn't enough to get iPython to display the map- you need to do a bit more work to get some HTML that iPython can render.

To display in the iPython notebook, you need to generate the html with the myMap._build_map() method, and then wrap it in an iFrame with styling for iPython.

import folium  
from IPython.display import HTML, display
LDN_COORDINATES = (51.5074, 0.1278) 
myMap = folium.Map(location=LDN_COORDINATES, zoom_start=12)
myMap._build_map()
mapWidth, mapHeight = (400,500) # width and height of the displayed iFrame, in pixels
srcdoc = myMap.HTML.replace('"', '&quot;')
embed = HTML('<iframe srcdoc="{}" '
             'style="width: {}px; height: {}px; display:block; width: 50%; margin: 0 auto; '
             'border: none"></iframe>'.format(srcdoc, width, height))
embed

Where by returning embed as the output of the iPython cell, iPython will automatically call display.display() on the returned iFrame. In this context, you should only need to call display() if you're rendering something else afterwards or using this in a loop or a function.

Also, note that using map as a variable name may might be confused with the .map() method of several classes.

回答2:

_build_map() doesn't exist anymore. The following code worked for me

import folium
from IPython.display import display
LDN_COORDINATES = (51.5074, 0.1278)
myMap = folium.Map(location=LDN_COORDINATES, zoom_start=12)
display(myMap)

回答3:

With considering the above answers, another simple way is to use Jupiter notebook.

for example (on the Jupiter notebook):

import folium

london_location = [51.507351, -0.127758]

m = folium.Map(location=london_location, zoom_start=15)
m

and see the result when calling the 'm'.

回答4:

Is there a reason you are using an outdated version of Folium?

This ipython notebook clarifies some of the differences between 1.2 and 2, and it explains how to put folium maps in iframes. http://nbviewer.jupyter.org/github/bibmartin/folium/blob/issue288/examples/Popups.ipynb

And the code would look something like this (found in the notebook above, it adds a marker, but one could just take it out):

m = folium.Map([43,-100], zoom_start=4)

html="""
    <h1> This is a big popup</h1><br>
    With a few lines of code...
    <p>
    <code>
        from numpy import *<br>
        exp(-2*pi)
    </code>
    </p>
    """
iframe = folium.element.IFrame(html=html, width=500, height=300)
popup = folium.Popup(iframe, max_width=2650)

folium.Marker([30,-100], popup=popup).add_to(m)

m

The docs are up and running, too, http://folium.readthedocs.io/en/latest/

来源：https://stackoverflow.com/questions/36969991/folium-map-not-displaying

标签

python

canopy

folium