May 2019
Beginner to intermediate
650 pages
14h 50m
English
Content preview from Learn D3.js
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Summary
In this chapter you explored one of D3's coolest features: geographical maps and projections, which is part of the d3-geo module.
Throughout this chapter we explored the main GIS data formats for Web-based vector maps: GeoJSON and TopoJSON. You learned how to read a GeoJSON file and display its shapes using d3.geoPath(), how to use a projection to place GeoJSON positions on a map, how to obtain GeoJSON features from TopoJSON data, merge shapes, create meshes and discover neighboring shapes. You also learned how to add graticules to a map, standard parallels, draw lines and circles.
A large section was dedicated to projections, one of the main features of the d3-geo module. D3 supports over a hundred projection functions in the d3-geo-projection ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.