Center of population Totally Explained

Everything about Center Of Population totally explained

In demographics, the center of population of a region is the geographical point nearest to all the inhabitants of that region, on average. The term was first used by philosopher Daniel Dennett in 1991 in his paper "Real Patterns" (External Link

) He did not, however take the idea seriously.

Determination

Centers of population are usually computed by minimizing a population-weighted average of a distance metric. In other words, for some place P, the distance from P to a list of populated places is computed, and the distance to each populated place from P is weighted by the population of that place. The choice of P for which such a weighted average has the lowest value is held to be the center of population for the particular list of populated places used.
   In practice, the person or agency doing the calculation decides whether to represent the area of interest in 2D or in 3D, and also the specific function to use for computing distances. For the particular case of flat maps, the center of population could also be defined as a center of mass (centroid) of the population of the area of interest.
   Decisions are also made on the granularity (for example, the "coarseness") of the population data, depending on population density patterns or other factors. For instance, the center of population of all the cities in a country may be different from the center of population of all the states (or provinces, or other subdivisions) in the same country. Different methods may yield different results.
   Practical uses for finding the center of population include locating possible sites for forward capitals, such as Brasilia, Astana or Austin. Practical selection of a new site for a capital is a complex problem that depends also on population density patterns and transportation networks.

World

It is important to use a culturally neutral method when dealing with the entire world. As described in (External Link

), the solution methodology deals only with the globe, and not with a two-dimensional projection of the Earth's surface. As a result, the answer is independent of which map projection is used or where it's centered. As described above, the exact location of the center of population will depend on both the granularity of the population data used, and the distance metric. For a granularity of 1000 km (for example, two population centers within 1000 km of each other are treated as part of a larger common population center of intermediate location) and geodesic distances as the metric, the world's center of population is found to lie "at the crossroads between China, India, Pakistan and Tajikistan", with an average distance of 5200 km to all humans (External Link

). The data used in the reference support this result to only a precision of a few hundred kilometers, hence the exact location isn't known.

Western nations

The mean center of U.S. population has been calculated for each U.S. Census since 1790. If the United States map were perfectly balanced on a point, this point would be its physical centroid. Currently this point is located in Phelps County, Missouri, in the east-central part of the state. However, when Washington, D.C. was chosen as the federal capital of the United States in 1790, the center of the U.S. population was in Kent County, Maryland, a mere 47 miles (76 km) east-northeast of the new capital. For example, a congressman from the Los Angeles must today travel inordinately far to work in the capital, whereas a congressman from Maryland or Virginia could easily drive to Washington, D.C.
   In 1993, the mean population center of Canada was found to be in the Township of Laxton, Digby and Longford, Victoria County, now part of the city of Kawartha Lakes, Ontario.
   In contrast to the U.S., Australia hasn't seen its population centroid move drastically since the creation of the country. In 1911, the centroid was in central New South Wales; in 1996, it was only slightly farther northwest.
   Likewise, the center of population in Great Britain didn't move much in the 20th century. In 1901, it was in Rodsley, Derbyshire and in 1911 in Longford. In 1971 it was at Newhall, South Derbyshire and in 2000, it was in Appleby Parva, Leicestershire.
   In Finland, the center of population is located in the municipality of Hauho. It is moving slightly to the west and south every year because people are moving out of the periphery areas of northern and eastern Finland.

Asia

The center of population for Bangladesh is close to Dhaka.
The center of population of Japan is in Gifu Prefecture, almost directly north of Nagoya city, and has been moving East South East for the past few decades. More recently, the only large regions in Japan with significant population growth have been in Greater Nagoya and Greater Tokyo.
For Thailand, the center of population lies in the central plains area northwest of Bangkok.

Median centers

Recently, the Center for the Study of Global Christianity in Massachusetts declared that the world's Christian Center of Gravity was located in Timbuktu, Mali. According to their definition of Center of Gravity, half of all Christians live west of Timbuktu and half live south of Timbuktu. Presumably they'd chosen the International date line to differentiate eastern from western people.
A median center of population can be used to show where the median east vs west person lives. A person living near Louisville, Kentucky has about half of the US population living north of him and half of the US population living south of him. This measure is meaningful only along the specific coordinate axes (north-south east-west).
The mean center of United States population has progressed westward and, since 1930, southwesterly. This reflects the population drift over the last two centuries. The southwest drift reflects the rise of major populations across Texas, the exponential growth of Las Vegas, and the rise of Los Angeles, which became the second largest American metro area, surpassing Chicago.

Sources

Bellone F. and Cunningham R. (1993). "All Roads Lead to... Laxton, Digby and Longford." Statistics Canada 1991 Census Short Articles Series.

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