Fig. 1: Conception of study area.
From: A physiological model of human mobility: A global study

Schematic concept of a region described as a grid structure of locations, origin \(\overrightarrow {{{{\boldsymbol{r}}}}_{{{\boldsymbol{i}}}}}\) and destination \(\overrightarrow {{{{\boldsymbol{r}}}}_{{{\boldsymbol{j}}}}}\) with a visualisation of possible destinations at the same travel distance (circles).