One of the benefits of supervising research students is that you can read a large number of scientific papers by proxy. In other words, my research students read more papers than I would ever have time to read and then they write reviews of the scientific literature that allow me to quickly gain an understanding of research in a particular field. Every now and again, a student refers to a paper that raises my curiosity to read it for myself. One of these was a paper published by Waldo Tobler in 1970 in which he describes the computational modelling of urban growth in Detroit, Michigan. Although, I used to live in Michigan, it was not the geographical connection that interested me but his invocation of the first law of geography: ‘everything is related to everything else, but near things are more related than distant things’. Professor Tobler was writing from the University of Michigan in Ann Arbor which he used in an example by highlighting that the population growth in Ann Arbor from 1930 to 1940 depended not only on the 1930 population of Ann Arbor, but also on the 1930 population of Vancouver, Singapore, Cape Town, Berlin and so on. Perhaps if he had been writing in 2020 he would have suggested that the rate of infection from coronavirus in Ann Arbor depends not only on the number of cases in Ann Arbor, but also on the number of cases Taipei, Milan, Toulouse, Dublin and so on.
Tobler WR, A computer movie simulating urban growth in the Detroit Region, Economic Geography, vol. 46, Supplement: Proceedings. Int. Geog. Union. Commission on Quantitative Methods, 234-240, 1970.