The production of mobility aggregates, and therefore indicators, from CDR data is underpinned by methodologies for analysing CDR data.

The methodologies we choose and how we implement them can have implications for the indicators produced and therefore the insights drawn from them. It is therefore important to understand how the CDR data has been analysed.

In this section we describe the core methodologies for the production of the mobility aggregates and indicators described in FlowGeek.