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Data Visualization and Cholera: An Unexpected Connection

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Radial chart london cholera

Data Visualization and Cholera: An Unexpected Connection

Necessity is the mother of invention, and in the mid-1800s, understanding the spread of cholera was a matter of life and death.

Ruthless Efficiency

Cholera was a ruthlessly efficient killer, with both rapid onset and severe symptoms. By the time the disease made its way to London and New York in the early 1830s, hundreds of thousands of people had died across Europe, Africa, and Asia.

Not only our personal and national interests, […] it may be said without exaggeration, [that cholera] concerns the whole human race.

– Thomas Whiteside Hime

Needless to say, the human race was concerned. Thanks to high-speed printing press technology, daily newspaper circulations were rising dramatically, and this allowed journalists to experiment with new reporting techniques, including charting data.

cholera line chart

At the time, the chart above was such a novel approach that it required four paragraphs to explain how to read it. People of that era were simply not used to seeing data in a visual form. At a glance though, the chart is extremely effective at communicating a grim message: cholera had ravaged New York City over the summer of 1849.

Despite the concerted push to eradicate the disease, the medical community was still largely in the dark about how to prevent future outbreaks. Because doctors could treat numerous patients without falling ill, it was assumed that a miasmic environment (i.e. slums, densely-packed housing) was causing the spread.

Data Viz in the Time of Cholera

Today, we have tools that allow us to map just about anything, but in the mid-1800s, mapping data was still an innovative concept.

As early as the 1830s, geographers began using spatial analysis to study cholera epidemiology. The heat map below shows which sections of Paris were hardest hit by a recent outbreak of cholera.

1832 cholera map paris

In 1854, Dr. John Snow was convinced that cholera was spreading via tainted water and decided to display neighborhood mortality data directly on a map. This method clearly revealed a cluster of cases around a specific pump.

john snow cholera map
View the full version of the map here

The result is one of the most influential maps in modern history.

In addition to the real-world utility the map provided in helping physicians understand how cholera was spreading, it also exemplified a seismic shift in thinking that opened up new avenues for data to be analyzed and displayed.

Despite the tragic circumstances of the time period, we can be thankful that the urgency of the situation allowed the world’s pioneering researchers, journalists, and physicians to experiment with new data visualization techniques to better understand the world.

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Misc

A Visual Guide to Human Emotion

For years, humans have attempted to categorize and codify human emotion. Here are those attempts, visualized.

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visual guide to human emotions wheel

A Visual Guide to Human Emotion

Despite vast differences in culture around the world, humanity’s DNA is 99.9% similar.

There are few attributes more central and universal to the human experience than our emotions. Of course, the broad spectrum of emotions we’re capable of experiencing can be difficult to articulate. That’s where this brilliant visualization by the Junto Institute comes in.

This circular visualization is the latest in an ongoing attempt to neatly categorize the full range of emotions in a logical way.

A Taxonomy of Human Emotion

Our understanding has come a long way since William James proposed four basic emotions – fear, grief, love, and rage—though these core emotions still form much of the foundation for current frameworks.

The wheel visualization above identifies six root emotions:

  1. Fear
  2. Anger
  3. Sadness
  4. Surprise
  5. Joy
  6. Love

From these six emotions, more nuanced descriptions emerge, such as jealousy as a subset of anger, and awe-struck as a subset of surprise. In total, there are 102 second- and third-order emotions listed on this emotion wheel.

Reinventing the Feeling Wheel

The concept of mapping the range of human emotions on a wheel picked up traction in the 1980s, and has evolved ever since.

One of these original concepts was developed by American psychologist Robert Plutchik, who mapped eight primary emotions—anger, fear, sadness, disgust, surprise, anticipation, trust, and joy. These “high survival value” emotions were believed to be the most useful in keeping our ancient ancestors alive.

plutchik emotion wheel

Another seminal graphic concept was developed by author Dr. Gloria Willcox. This version of the emotions wheel has spawned dozens of similar designs, as people continue to try to improve on the concept.

willcox feelings wheel

Further Exploration

The more we research human emotion, the more nuanced our understanding becomes in terms of how we react to the world around us.

Researchers at UC Berkeley used 2,185 short video clips to elicit emotions from study participants. Study participants rated the videos using 27 dimensions of self-reported emotional experience, and the results were mapped in an incredible interactive visualization. It is interesting to note that some video clips garnered a wide array of responses, while other clips elicit a near unanimous emotional response.

Here are some example videos and the distribution of responses:

reported emotional reaction to video clips

The data visualization clusters these types of videos together, giving us a unique perspective on how people respond to certain types of stimuli.

Much like emotion itself, our desire to understand and classify the world around us is powerful and uniquely human.

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Markets

Mapping the World’s Key Maritime Choke Points

Ocean shipping is the primary mode of international trade. This map identifies maritime choke points that pose a risk to this complex logistic network.

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maritime choke points

Mapping the World’s Key Maritime Choke Points

Maritime transport is an essential part of international trade—approximately 80% of global merchandise is shipped via sea.

Because of its importance, commercial shipping relies on strategic trade routes to move goods efficiently. These waterways are used by thousands of vessels a year—but it’s not always smooth sailing. In fact, there are certain points along these routes that pose a risk to the whole system.

Here’s a look at the world’s most vulnerable maritime bottlenecks—also known as choke points—as identified by GIS.

What’s a Choke Point?

Choke points are strategic, narrow passages that connect two larger areas to one another. When it comes to maritime trade, these are typically straits or canals that see high volumes of traffic because of their optimal location.

Despite their convenience, these vital points pose several risks:

  • Structural risks: As demonstrated in the recent Suez Canal blockage, ships can crash along the shore of a canal if the passage is too narrow, causing traffic jams that can last for days.
  • Geopolitical risks: Because of their high traffic, choke points are particularly vulnerable to blockades or deliberate disruptions during times of political unrest.

The type and degree of risk varies, depending on location. Here’s a look at some of the biggest threats, at eight of the world’s major choke points.

maritime choke point risks

Because of their high risk, alternatives for some of these key routes have been proposed in the past—for instance, in 2013 Nicaraguan Congress approved a $40 billion dollar project proposal to build a canal that was meant to rival the Panama Canal.

As of today, it has yet to materialize.

A Closer Look: Key Maritime Choke Points

Despite their vulnerabilities, these choke points remain critical waterways that facilitate international trade. Below, we dive into a few of the key areas to provide some context on just how important they are to global trade.

The Panama Canal

The Panama Canal is a lock-type canal that provides a shortcut for ships traveling between the Pacific and Atlantic oceans. Ships sailing between the east and west coasts of the U.S. save over 8,000 nautical miles by using the canal—which roughly shortens their trip by 21 days.

In 2019, 252 million long tons of goods were transported through the Panama Canal, which generated over $2.6 billion in tolls.

The Suez Canal

The Suez Canal is an Egyptian waterway that connects Europe to Asia. Without this route, ships would need to sail around Africa, which would add approximately seven days to their trips. In 2019, nearly 19,000 vessels, and 1 billion tons of cargo, traveled through the Suez Canal.

In an effort to mitigate risk, the Egyptian government embarked on a major expansion project for the canal back in 2015. But, given the recent blockage caused by a Taiwanese container ship, it’s clear that the waterway is still vulnerable to obstruction.

The Strait of Malacca

At its smallest point, the Strait of Malacca is approximately 1.5 nautical miles, making it one of the world’s narrowest choke points. Despite its size, it’s one of Asia’s most critical waterways, since it provides a critical connection between China, India, and Southeast Asia. This choke point creates a risky situation for the 130,000 or so ships that visit the Port of Singapore each year.

The area is also known to have problems with piracy—in 2019, there were 30 piracy incidents, according to private information group ReCAAP ISC.

The Strait of Hormuz

Controlled by Iran, the Strait of Hormuz links the Persian Gulf to the Gulf of Oman, ultimately draining into the Arabian Sea. It’s a primary vein for the world’s oil supply, transporting approximately 21 million barrels per day.

Historically, it’s also been a site of regional conflict. For instance, tankers and commercial ships were attacked in that area during the Iran-Iraq war in the 1980s.

The Bab el-Mandeb Strait

The Bab el-Mandeb Strait is another primary waterway for the world’s oil and natural gas. Nestled between Africa and the Middle East, the critical route connects the Mediterranean Sea (via the Suez Canal) to the Indian Ocean.

Like the Strait of Malacca, it’s well known as a high-risk area for pirate attacks. In May 2020, a UK chemical tanker was attacked off the coast of Yemen–the ninth pirate attack in the area that year.

Due to the strategic nature of the region, there is a strong military presence in nearby Djibouti, including China’s first ever foreign military base.

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