Projecting the US map
In this recipe we are going to start with projecting the US map using D3 GEO API, while also getting familiar with a few different JSON data formats for describing geographic data. Let's first take a look at how geographic data are typically presented and consumed in JavaScript.
GeoJSON
The first standard JavaScript geographic data format we are going to touch upon is called GeoJSON. GeoJSON format was originally written and maintained by an Internet working group of developers. Later it was standardized by the Internet Engineering Task Force (IETF) with RFC 7946 and published in August 2016.
GeoJSON is a format for encoding a variety of geographic data structures. GeoJSON supports the following geometry types: Point, LineString, ...
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