Recently, I’ve been working on a project involving travel time matrices. These matrices are the output of specialized routing software and are used in social science research, urban planning, and policy analysis. They look like this: origindestinationminutes AA0 AB9 AC15 BA10 BB0 BC21 CA13 CC0 Where origin and destination are the identifiers of geographic points (usually Census geography centroids) and minutes is the travel time between the points. This is the “long” travel time matrix ...
