Background map

This is the background map section of the gallery. If you want to know more about this kind of chart, visit If you're looking for a simple way to implement it in d3.js, pick an example below.

About input data

Difference between geoJson and topoJson. But not necessary thanks to leaflet.

From a geoJson file

Input data for maps is geoJson format. D3.js works very well to display this kind of information using path.

Using the Leaflet.js open source library

Leaflet is an open-source JavaScript library for mobile-friendly interactive maps. Awesome for background maps. See the range of background tiles you can use here and here.

Selection of blocks

A few blocks with more complicated codes to showcase the possibility of the d3-sankey plugin

Related chart types

Hexbin map
Bubble map