We have spent a significant amount of time creating and interacting with maps in our previous chapters. In all our examples, the geographic data was included. In this chapter, we will explain how to find geographic data about any country in the world.
There are typically two sets of data that we will need to create a map in D3:
- A dataset that represents the geographic shape of our map (geodata)
- Some meaningful data that we want to visualize on the map (for example, population density by US countries, or unemployment rate by countries in the world)
This chapter is focused on understanding, manipulating, and optimizing geodata for map visualizations. We will accomplish these goals by:
- Explaining three important formats that contain geospatial vector data
- Finding, downloading, and working with large amounts of map data
- Using techniques...
