People who often surf the Internet basically know that China’s economically developed cities are mainly located in the Yangtze River Delta and the Pearl River Delta. Then, where are the geographical centers of these economically developed cities?
The standard error ellipse can tell us the answer!
The center of the standard error ellipse is the geographic center of these cities, and the direction and radius of the standard error ellipse can represent the approximate range of the distribution of these cities and the positional relationship with the geographic center. If it is a double error ellipse, it can cover 68% of the cities, if it is a double error ellipse, it can cover 95% of the cities, and if it is a triple error ellipse, it can cover 99% of the cities.
The following are the top 24 cities in China's GDP ranking found online. We take these cities as examples to analyze the standard error ellipse.
The selected cities are distributed as shown in the figure below:
The tool we use is Directional Distribution, and the tool interface is as follows:
Click OK, wait a while, you can see the results.
The above figure is a 1x error ellipse. It can be seen from the figure that the center of the standard error ellipse is probably in the southwest of Anhui, covering all of the Yangtze River Delta and part of the Pearl River Delta, excluding Beijing-Tianjin-Hebei.
As shown in the figure above, if it is twice the error ellipse, the Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta can be covered. The northeast and southwest are still hard to reach, which further confirms the view that China's economic center is located in East and South China.