Agent-based modelling allows for the simulation of complex systems integrating spatial data to explore problems of geography, the environment, planning and social systems. Two simulations designed to assist with modelling travel time to services have been developed and are shown here.
The first uses a travel time output from the SAGA-GIS application and adds transport network agents (cars) and allows the interactive placement of patient agents simulating cases of patient travel and demonstrating the integration of raster and network forms of travel. The second incorporates the travel time calculation into the ABM and allows the rapid exploration of multiple travel time scenarios through a user-friendly interface. This model explores how Agent-based travel time modelling can assist local government planners to simulate impacts on access to care through enabling changes to continuous variables (such as rainfall or travel speed), and the addition of discrete factors (such as road breaks or new services). In both cases, the ABM format removes any need for GIS or modelling skills through creating a simple and accessible format for interactive scenario modelling.
These models have been developed in Netlogo. To run them you will need to download and install the free modelling platform. These models were developed for Netlogo version 5+. https://ccl.northwestern.edu/netlogo/download.shtml
Model 1 -Distance transform implementation
Model 2 – Raster + network implementation
These models are described in detail in the paper:
Fisher, R. & Lassa, J., 2017. Interactive, open source, travel time scenario modelling: tools to facilitate participation in health service access analysis. International Journal of Health Geographics, 16(1)
If you mention this model please use the citations above.
A description to the distance transform method used is available here: