Each example is a working example to build a Choropleth Of Pennsylvania County Populations. In each subdirectory of the repo is a working example for the selected programming language. To view the R and Python notebooks in the browser see the links below:

• R Notebook
• Python Notebook
• HTML/JS Version

Some additional helpful resources for mapping/leaflet are below:

• Leaflet: Contains tutorials and general documentation for leaflet.js
• Folium: Folium is a python package which uses leaflet.js
• IPython Examples: Large collection of IPython Notebook examples using Folium
• Leaflet for R: Leaflet implementation for R. Site has working examples and tutorials
• GeoJSONLint: Tool for checking the validity of your GeoJSON files. Copy/Paste or just upload the file and the tool checks for errors and allows you to view the file applied to a map.
• geojson.io: Interactive tool which applies shape data as you enter it into the editor
• Leaflet Base Maps: Prebuilt base map templates which can be used by leaflet
• Mapbox: Tools for building and designing maps.
• Mapbox.js: leaflet plugin which allows the user to integrate mapbox services and data stored on mapbox.