Tag Archives: gridded cartogram

The Disappearance of Childhood

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Children are the living messages we send to a time we will not see.
(The Disappearance of Childhood, Neil Postman)

In the previous post I showed a map of the global distribution of malnutrition among the youngest children. To complete this picture, I used the same subnational Global Poverty Data from SEDAC and combined the data about the proportion of children with the total population (derived from the GPW database). Where information was missing, I used information from the national-level UN World Population Prospects to complete the data and generated a grid of the global distribution of children on a subnational level. The result of this is a new gridded cartogram display of the world’s children (aged under 5) which shows each grid cell resized according to the total number of children living there (as in many world maps on this website, I use the worldmapper colour scheme for the countries which makes the map easier to read). The following map therefore gives every child under the age of five the same amount of space, with additional information about the variation beyond the country borders. This is today’s world of children:

Map / Gridded Cartogram of Children in the World
(click for larger map)

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Hungry Children

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After several of weeks in the headlines, the United Nations has eventually declared a famine in parts of the Horn of Africa today after large parts of the people there suffer from the worst drought in decades. Malnutrition is a much wider ranging problems in the poorer parts of the world, although it only comes to our mind when we see headlines as we do today. There are startling facts about malnutrition that are very contradictory to the wasteful lifestyles in the wealthy parts of the planet (a recent FAO study suggests that one third of the world’s food goes to waste): Continue reading →

Two Sudans

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The human shape of the planet is constantly changing, so that the map of the world needs to be drawn every once in a while. On this 9th of July we are witnessing the birth of a new nation, with the south of Sudan officially becoming independent from its northern (now) neighbour. The following gridded population cartogram shows the population distribution within and between these two nations, giving every person living in the region the same amount of space. For the much smaller population in the south it will be hard work ahead in building a new nation, and for statisticians it will be similar hard work to improve on the population data that went into the creation of this map, as the pattern shows how crude the information about the population distribution in some parts of the two countries is – however, it still gives a good indication of where people living in the two new Sudans that are now on the world map:

Map / Gridded Population Cartogram of Sudan in 2011
(click for larger map)

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A Blue Planet

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Maney, the publishers of the Cartographic Journal have today released their Maney Feature of the Month ‘Cartography & Surveying’ about cartography and surveying. Part of that feature is my contribution about some of the mapping results of my PhD research. It focuses on a series of maps that show the gridded cartogram technique applied to various themes from the human and physical environment, and briefly explains the underlying method.
As this blog entry also happens to be the 100th post on the Views of the World website, I have created a new version of the gridded world population cartogram. The map shows our blue planet a little brighter than the version that I created for the Maney feature (which puts the main focus on the topographic display), and also displays the major rivers traversing the spaces of humanity as pulsing arteries of an essential element. This is the ‘Blue Human Planet’:

Map of a Blue Planet: Gridded Population Cartogram of the World
(click for larger map)

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A Revolutionary World

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The people of the Arab world became a quite influential political voice in recent months, and the outcome of the Arab and the Middle East unrest remains unclear. But the events have put a region back on our mental map of the world that many had only in mind as either a holiday destination or a region to avoid. This picture has clearly changed, and many previously unknown places have become of people’s geographical knowledge. Why some places are more prominently named than others often has a direct link to the human geography of the countries where these recent events unfolded: The countries of the Arab world are characterised by diverse population patterns that draw a very different picture than the normal land areas suggest. Each of the countries human shapes can be seen in the World Population Atlas, which also provides a view of the global population patterns.
A coherent picture of the population patterns in the Arab region is given in the following new gridded population cartogram that I created from the countries of the Arab League member states, in which so far most of the democracy movements unfolded.
The Arab League has 22 member states with an estimated total population of 360 million who live in an area of 13,953,041 square kilometres (data from Wikipedia). The population density of 24.33/sqkm is less meaningful as a single figure. The population map shows that largest population densities concentrate along the coastal areas, while large areas are sparsely populated desert regions. The major population centres in the different countries were often the hotspots of the unfolding protests.
This is the human shape of the Arab world:

Population Cartogram of the Arab World
(click for larger map)

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Megacities on the Map

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Megacities are major global risk areas. Due to highest concentration of people and extreme dynamics, they are particularly prone to supply crises, social disorganization, political conflicts and natural disasters. Their vulnerability can be high.

This quote from the IGU’s MegaCity TaskForce draws a quite bleak picture of what some believe to be the future of living for humankind. The UN World Urbanisation Prospects finally saw the urban populations surpassing rural living for the first time in human history in recent years, but we must not forget that these urban populations do not all live in what is referred to as a megacity.
A megacity basically is nothing more than a very large city. Widely used is a population of 10 million, but other definitions do exist, ranging from 5 or 8 million, and some people, such as German geographer Bronger are also including the population density of 2000 p. per sq km as a defining factor). The definition of a megacity should also be seen as a rather vague delimitation for a phenomenon that – despite it’s quantitative dimension – has a very qualitative nature: What happens, when extremely large numbers of people live in a very limited amount of space, and what happens, if these areas of very high density living even continue growing.
In the year 2000 there were 39 cities with a population of more than 5 million inhabitants, 2/3 of which were in the developing countries. This was a population of 225 million people, not even 5% of the world’s population. Today we have about 400 million people living in the largest cities on the planet – still far from the majority of the now more than half of the world’s population living in cities. And perhaps the majority of people on this planet may never live in one of these megacities. Why is everyone talking about megacities then anyway? The sheer size make these cities the ultimate examples for urbanization, and provide an insight to the diverse processes in such complex urban spaces. They are like a real-life laboratory for urban geographers who try to understand the impact and implications of urbanization processes, and may contribute to solutions how the urban future of humanity can be actively created and lead to a better and perhaps more sustainable life on this planet.
A gridded population cartogram can help to understand not only the locations of these largest of cities, but provides a look into their setting within the global population patterns by giving space to people and allowing to see where many people live in these large cities, and where people are in relation to these cities. A normal map (see further down) shows the high concentration of megacities especially in Asia, but we can see from the population cartogram that these are in those anyway very densely populated regions, while the megacities in South America appear more like (relatively seen) solitary bodies.

Cartogram / Map of the World's Megacities in 2015
(click for larger map)

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