Book Image

Learning D3.js 5 Mapping - Second Edition

By : Thomas Newton, Oscar Villarreal, Lars Verspohl
Book Image

Learning D3.js 5 Mapping - Second Edition

By: Thomas Newton, Oscar Villarreal, Lars Verspohl

Overview of this book

D3.js is a visualization library used for the creation and control of dynamic and interactive graphical forms. It is a library used to manipulate HTML and SVG documents as well as the Canvas element based on data. Using D3.js, developers can create interactive maps for the web, that look and feel beautiful. This book will show you how build and design maps with D3.js and gives you great insight into projections, colors, and the most appropriate types of map. The book begins by helping you set up all the tools necessary to build visualizations and maps. Then it covers obtaining geographic data, modifying it to your specific needs, visualizing it with augmented data using D3.js. It will further show you how to draw and map with the Canvas API and how to publish your visualization. By the end of this book, you'll be creating maps like the election maps and the kind of infographics you'll find on sites like the New York Times.
Table of Contents (13 chapters)
6
Finding and Working with Geographic Data

Visualizing data per country and adding a tooltip

You learned to build a data-driven and -giving representation of your visual. You have also used it to highlight the country at hover. However, you haven’t really tapped into the plentiful options of interaction this gives you. Let’s do this now. There’s a lot you could do, but I think a tooltip would be a reasonable place to start.

Before we embark on the tooltip build, let’s add some more interesting data to the globe. So far, we have country name, country name abbreviation, and population estimate. That’s already something to work with. However, let’s task ourselves with adding an additional data source to our globe, visualize it appropriately, and add a sensible interaction for user exploration.

As a little reminder, this is what you will build:

Our final Canvas adventure
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