In fact, over the past few weeks, middle-income countries have taken over high-income countries in terms of new confirmed cases and new deaths.
There can hardly be any doubt that the pandemic is heading south, to parts of the world where health infrastructure and social safety nets too often are weak. It is based on the density changes of rock bodies and their effect on the acceleration of gravity. Gravity is a versatile geophysical technique used to detect and identify subsurface bodies and anomalies within the Earth. Finally, to the extent that deaths go uncounted in certain countries, the center of gravity could be impacted.ĭespite these caveats, the center of gravity allows for a simple visualization of how the pandemic is evolving globally over time. Autograv CG5 gravimeter used to measure changes in the acceleration due to gravity. Secondly, since we only use country-level data, we place all daily deaths at the geographical midpoint of a particular country, meaning that the map neglects important subnational spatial patterns. The center of gravity makes most sense when, at a given time, the majority of cases are concentrated in one region. Firstly, supposing half of the case deaths are in Brazil and the other half in Russia, and there we no cases anywhere else, then the center of gravity would be somewhere between Russia and Brazil, probably in Northern Africa, despite this region not seeing any cases. The map has some important caveats, however. Increased cases in Africa, the Middle East and South Asia are further exacerbating this trend. In the last month, driven by increased cases in South America, and particularly Brazil, the center of gravity of the pandemic is moving steadily towards the global south. Applying the method to COVID-19 deaths using data from Johns Hopkins Coronavirus Resource Center allows for tracking the epicenter of the pandemic over the past months.ĭoing so reveals that the center of gravity moved from China in February, to Italy in March, and towards the US in April. The method has since been used to show that the center of gravity of global poverty is shifting towards Africa. Quah (2011) used this method to show how the center of gravity of global economic activity has shifted from Europe to China over the past decades. In particular, we can locate all COVID-19 deaths recorded at a given day according to their location, find the average location, and project this point ("the center of gravity") to the earth's surface. One way to spatially visualize this shifting gravity of the pandemic is by using an idea and method from Quah (2011) to track how the center of gravity of a particular variable is shifting over time. Weve got the study and writing resources you need for your assignments.
CENTER OF GRAVITY METHOD MAP TRIAL
Start your trial now First week only 4.99 arrowforward. Over the past several months, the epicenter of the COVID-19 pandemic has shifted from China to Italy to the United States. Solution for Example of center-of-gravity method.