Data Available in Northern Ireland: Journey Time and Distance Data
Journey times and distances should be used to calculate isochrones and to determine catchment areas. A large number of sources are available, ranging from simple paper based maps to electronic transport models.
A distinction between data sources can be made on the basis of how journey time information is supplied. Some data sources/software packages supply information on an interrogative basis, i.e. for specific pairs of origins and destinations at a time. For instance, a rail journey planner can be used to provide journey times between two stations on the rail network. Other data sources/ systems will be able to provide journey times for a range of origin-destination (O-D) pairs at a time. Transport models for instance, where available, can be used to supply journey time matrices for car or public transport modes for any combination of O-D’s in a study area.