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Learning D3.js Mapping

Learning D3.js Mapping

By : Newton, Oscar Villarreal
4.3 (7)
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Learning D3.js Mapping

Learning D3.js Mapping

4.3 (7)
By: Newton, Oscar Villarreal

Overview of this book

If you are interested in creating maps for the web GIS data, this book is for you. Familiarity with D3.js will be helpful but is not necessary.
Table of Contents (9 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Gather Your Cartographer's Toolbox
1. Gather Your Cartographer's Toolbox
Quick bootstrap
Step-by-step bootstrap
Optimizing geographic data files with TopoJSON
Using the web browser as a development tool
Summary
2
2. Creating Images from Simple Text
2. Creating Images from Simple Text
Introduction – general knowledge
Positioning elements
Line
Rectangle
Circle
Polygon
Path
Transform
Grouping
Text
Summary
3
3. Producing Graphics from Data – the Foundations of D3
3. Producing Graphics from Data – the Foundations of D3
Creating basic SVG elements
Enter
Update
Exit
AJAX
Summary
4
4. Creating a Map
4. Creating a Map
Foundation – creating your basic map
Experiment 1 – adjusting the bounding box
Experiment 2 – creating choropleths
Experiment 3 – adding click events to our visualization
Experiment 4 – using updates and transitions to enhance our visualization
Experiment 5 – adding points of interest
Experiment 6 – adding visualizations as a point of interest
Summary
5
5. Click-click Boom! Applying Interactivity to Your Map
5. Click-click Boom! Applying Interactivity to Your Map
Events and how they occur
Experiment 1 – hover events
Experiment 2 – tooltips with visualizations
Experiment 3 – panning and zooming
Experiment 4 – orthographic projections
Experiment 5 – rotating orthographic projections
Experiment 6 – dragging orthographic projections
Summary
6
6. Finding and Working with Geographic Data
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6. Finding and Working with Geographic Data
GeoData file types
Summary
7
7. Testing
7. Testing
Code organization and reusable assets
Project structure
Writing testable code
Unit testing
Creating resilient visualization code
Summary
8
Index
Index

GeoData file types

There are dozens of file formats that represent geographic information. In this section, we will focus on three file types: shapefiles, GeoJSON, and TopoJSON.

What are shapefiles and how do I get them?

Shapefiles are the most popular vector-based file format. They contain polygons and lines that represent geographic boundaries. The shapefile format was developed by the company Esri as an open standard to work with Geographic Information Systems (GIS). This vector information can also describe other geographic entities (rivers, lakes, and railroads). In addition, the file format has the ability to store data attributes that are useful when working with visualizations (for example, the name of the geographic object, the type, and some relationships). Most importantly for us, there is a large repository of free shapefiles located at http://diva-gis.org. This repository contains a tremendous wealth of data at different levels of specificity and granularity.

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