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:

Interactive World Map: NSA Interception

Last year, Edward Snowden leaked National Security Agency documents that remind us the insecure of our privacy. Here is an interactive world map, taking reference from the Snowden reports on surveillance by NSA, shows which countries are being intercepted by the spy services from the Western World (Five Eyes group – the US, UK, Canada, Australia and New Zealand).

The map is created by Sniffmap, which has run random tests on international internet traffic originating from a country for checking how many routes are intercepted by Five Eyes.

The concept of this map is checking if an internet route between two IP addresses would pass by an NSA controlled country. If yes, the route will be considered as intercepted that you can see around 80% of the routes are captured by Five Eyes in the map.

Limitations of the map:
Sniffmap admits that the map fails to take account data captured by non-Five Eyes countries.
The map depends on geographic IP to determine location of routers, which is not 100% accurate.
This map is lacking most of the data from African countries that you could improve it by contributing traceroute results.

world heat map nsa interception

Health Map of the UK


Today, we find a health map of the UK, which reveals that East Anglia is one of the healthiest regions while Wales is the worst one in the UK.


In the map, health condition can be measured by following categories:

  • number of risk factors
  • smoking
  • overweight or obese
  • undertake health screens
  • eating habits
  • exercise
  • overall

And the rankings are marked as “Good”, “Bad”, and “Very Bad” in different colors.

The results are based on the responses from 10000 employees across the country for showing how people’s health would be affected by living and working.

Map Reviews: 2.5/5 Stars
The map is not easy to read as the indications for those markers are not clear that map users cannot see the health rankings in the first sight.

Alternatively, heat map can be created for presenting the rankings in this case so map users can better understand which region is the healthiest and the worst. Since there are many categories in this report, heat maps can also be created by categories, and a category legend can be created for selection use.

Heat Map: Map shows Countries Are Responsible to Climate Change

If you are wondering which countries emit more carbon dioxide and should be more responsible to climate change, you may refer to the following heat map for more ideas.

This heat map is created by New Scientist that the size of each countries are based on the amount of greenhouse gases they emit.


There are 0.74 °C warming between 1906 and 2005, and the United States is responsible for 22 percent (0.15 °C ) while China and Russia are responsible for 9 percent and 8 percent respectively.

It is interesting that though the U.S.A., China and Russia are countries should be most responsible to the climate change, United Kingdom and Germany are countries mostly heated.

We all understand that global warming and climate change is a world-wide issue that we all should cooperate together, and tackle it. For more information, you can refer to:
World Map: Cities that Climate Change Will Hit First
Carbon Emissions in America

UK Map: Environment Agency Flood Warnings and Alerts map

There is still serious flooding along the Britain coast, and the Met Office suggested that conditions could turn colder or some snow next week. You can now check out the updated flood alerts and warnings across Berkshire and Surrey in the following interactive Google Maps.


Previously, we have shared two flooding maps. Please click the following links for more flooding information:

Interactive UK Map: Flooding and Weather Warnings

You can now check out the current flood warnings and other weather warnings with pictures in UK in following interactive map.

Map users can mouse click a specific marker to see detailed description of current status and picture of the region. There are also map legends for indicating the region colors and marker icons.


Last month, we have also shared anther interactive flood warning maps (a Facebook app) that you may also find it useful.

Interactive UK Map: Children are Waiting for Adoption


If you are family in the United Kingdom, which is looking forward to adopt children, you may find the following interactive map quite useful. The following interactive map is created by First4Adoption that shows the number of children waiting to be placed within each local authority adoption agency in England. Mouse click the icons to see details about the local authority.

According to the map, there were 6890 children waiting to be placed while there were 4093 approved adopters waiting for a child. Approved adopters cab adopt children through any agency anywhere in the country. Now, would-be adopters are being urged by a minister to manipulate the following map to help matching them to the children in need of a home.

Check out the map below and get the updated information now!

Map Reviews: 4/5 Stars
This map is very informative with simple & smart design. First, the purple tone map color settings(e.g. infobox background colors, icon colors, border colors) perfectly match with heat map colors. Second, text content is neatly presented within infobox using “table”, and further information can be viewed by clicking the inserted URL button. Last but not the neat, there is heat map legend for indicating the distribution of to-be-adopted children across the country.

Interactive Flood Warnings Map for United Kingdom

Due to the storm conditions in the United Kingdom, many people are keeping an eye on flood alerts there. Here we have found an interactive map (and is also an app in Facebook) of flood warnings in the UK (from the rivers and the sea for England and Wales).

In the map, users can check on the warning icon to see the further details in the popup box. Please note that FloodAlerts does not provide information on flood depth, speed or volume of flow. It doesn’t show flooding from other sources, such as direct runoff from fields, or overflowing sewers that map users have to check their local Environment Agency Office or Local Authority for more information on these flood risks.


National Geographic Cooperates with Google Maps Engine to Shares Rich Map Content

Last week, Google Maps has announced that we can now view some amazing paper maps from the National Geographic Society using Google Maps. Google Map Engine has newly launched public data program that organizations can distribute their map content to Google’s cloud infrastructure users. And this time is National Geographic, who aims to share the amazing paper maps with public by utilizing this public data program using Google Maps Engine to ”to overlay our maps with interactive editorial content, so the maps can ‘tell stories’ and raise awareness about environmental issues and historic events,” representative of National Geographic said. Currently, everyone is able to access several free public maps, and some high-resolution maps and print versions may need license for to access in order to raise funds for the nonprofit mission of National Geographic.

Here is a sample map image that search for “Oxford Street, London, UK” in 1979: national-geographic-google-maps-medieval-england-1979

Further information:
Image maps can be converted into interactive image maps using iMapBuilder Online or iiCreator that interactive overlays (e.g. popup infobox with images & videos, external links, labels, lines, polygons) can be added on the image maps.
More sample maps can be found at:

Interactive World Map: Foreign Players Signed by Manchester United and Manchester City


If you are a football lovers, especially a fan of Manchester United, you should not miss the following world map about all the foreign stars, who have played for Manchester United and Manchester City from 1893 – 2013.

In this Manchester World Map, 204 foreign stars, who have played for Manchester United and Manchester City by their hometown from 1893 – 2013 have been pinned on the map that you can see the individual data by scrolling the drop-down box below  the map.

Here are some guides for using the map:

  • Press “+”/”-” button for zooming
  • Select rectangle tool to zoom in by drawing a sector
  • Press Home button for default map view
  • Select time slot in the drop-down box / scroll the time line
  • Uncheck “Show History” checkbox for viewing data for individual year only
  • Blue dots represent Manchester City while red dots represent Manchester United
  • Mouse click the dots to see detailed information

Map Reviews: 3/5 Stars

Though this map is very informative and useful, especially to those Manchester fans, it is not user-friendly enough in following aspects:

  • Cannot pan the map. Though sometimes a hint will be popped up and said we can pan the map by “press, hold, and then pan”, I could never pan the map as I could only draw a rectangle all the time.
  • Lack of a map legend for indicating the meanings of various colored dots.
  • External links, videos or photos can be inserted to the popup boxes for detailed information.

Related posts:
Headquarters of Sponsors for Manchester United
Interactive UK Map 2012-2013 Premier League