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:

Heat Map: How the World Think Towards America


How do you think about America? The Pew Research Global Attitude Project has tracked opinion in 39 countries to see how the public think about the United States, and then Business Insider, Australia rendered the data in the below heat map.


According to the map:

  • Philippines, Ghana, and Israel even have higher opinion of the U.S. rather than Americans.
  • Among all the Asian countries, South Koreans have the highest opinion towards the U.S.
  • People in Pakistan are most unfavorable towards the U.S. among all the interviewed countries.

Detailed bar chart report can be seen HERE.

Map Reviews: 3.5/5 Stars
The static world map and bar chart can be combined into an interactive map in few steps:

  1. Create heat map by importing heat map data
  2. Create mouseover infobox for each region
  3. Insert bar chart image into each infobox
  4. External links can also be added to the regions for additional information

Clickable Heat Map: Countries with Travel Warnings

clickable-world-map-countries-with-travel-warningAn interactive heat map was created, which based on the advice from DFAIT, to display the safety index of different countries. Travelers should check the map, especially those advice in the infobox before planning their trips.

According to the advice from Canada’s Department of Foreign Affairs and International Trade, travelers should avoid all travel in several countries, include North Korea, Iran, Iraq, Afghanistan, Yemen, Ethiopia, Niger, and more. Countries like Pakistan and Libya are not recommended for travel either, while countries in North America and Europe are recommended.

Click on the image to get the details.