Data Viz MeetUp - Johannesburg 2 Oct 2014

How to create a ward level map of the South African population using D3.

##Part 1: Getting and preparing the data ##

Shape files from the demarcations board

http://www.demarcation.org.za/

Convert to GeoJSON here

http://converter.mygeodata.eu/vector

Combine with topojson

https://github.com/mbostock/topojson/wiki/Command-Line-Reference

$ topojson -o za.json --properties wards.json prov.json

Shrink with MapShaper

http://www.mapshaper.org/

http://en.wikipedia.org/wiki/Coastline_paradox

##Part 2: Making it look neat ##

Choosing a projection

https://github.com/mbostock/d3/wiki/Geo-Projections

http://xkcd.com/977/

SVG styling

http://www.w3schools.com/svg/default.asp

##Part 3: Adding colour##

Population Data

http://interactive.statssa.gov.za/superweb/login.do

Use color brewer

http://colorbrewer2.org/

population.cvs

https://github.com/fletchjeff/datavizmeetup/blob/master/data/population.csv

##Part 4: Bells and whistles## Pan and Zoom and Tool tip for mouse overs

Useful starting points in D3

http://bost.ocks.org/mike/join/

http://bost.ocks.org/mike/selection/

http://bost.ocks.org/mike/circles/

http://bost.ocks.org/mike/map/