Interactive Heat Map: Global Slavery Index 2013

According to the Walk Free Foundation’s Global Dlacery Index 2013, there are nearly 30 million slaves in the world, and almost 60,000 of them are living in the U.S. Here is an interactive world map about the index.

According to the Walk Free, slavery defines as one of the following: human trafficking, forced labor, debt bondage, forced or servile marriage, and the sale or exploitation of children including in armed conflict.

The index ranks 162 countries based on a combined measure of three factors: estimated prevalence of modern slavery by population, a measure of child marriage, and a measure of human trafficking in and out of a country.

The index is mapped into two maps: an interactive heat map & an interactive bubble chart. In the heat map, country with higher slavery prevalence is highlighted with darker red while country with lower slavery prevalence is highlighted with yellow. Map users could see details of each country by mouse clicking the region, or select specific category in the category legends.

In the bubble chart, countries are being plotted on the chart according to their prevalence rank vs human development index/financial service index/corruption index. However, there is no popup box of each bubble for detailed information, and no map legend to indicate various bubble sizes that a bit confuse the map users.

interactive heat map the global slavery index 2013

According to the index, 10 countries with the highest prevalence of slavery are Mauritania, Haiti, Pakistan, India, Nepal, Moldova, Benin, Cote d’Ivoire, Gambia, Gabon. Among all the above mentioned countries, India has the most slaves in the world, with an approximated 14 million. 

However, even countries like Iceland, Ireland, and the United Kingdom rank 160 in the index, it does not mean these countries are slavery free, for example, it is estimated there are between 4200 to 4600 “slaves” in the UK.

Map Review: 4.5/5 Stars
We love this map as the map design is simple but informative with clear instruction and indications for users to filter related information in seconds.
There are just minor suggestions to the bubble chart:

  • add a map legend to indicate the bubble sizes
  • insert infobox for each bubble for detailed information

Alternatively, showing data of each country with bubble can be presented on the world map rather than on the chart. Bubble chart map can be easily created in mapping software that you may take following video for reference: