URBAN ACCESSIBILITY BRISBANE, AUS
This project presents an "Ease of Access Index Map" that evaluates the accessibility of Brisbane's city centre based on various weighted modes of transportation, including walking, biking, public transport, and driving. The map's accessibility scores range from 1 (very easy) to 7 (very difficult), providing an intuitive view of travel ease within a set timeframe from the city centre. The ease of access levels were determined by stacking 10-minute isochrone polygon layers for various travel modes from the city centre, assigning cumulative scores based on travel time, with lower scores indicating easier access and higher scores indicating longer or more complex routes. By utilizing isochrones at 10-minute intervals, this index visually demonstrates the practical accessibility challenges and advantages across Brisbane.
A series of 10-minute isochrones were applied for each transportation mode. Isochrones were calculated up to 60 minutes for driving and up to 90 minutes for walking, biking/e-biking, and public transport. Each isochrone represents a buffer around the city centre based on the distance achievable in 10-minute intervals. These vectors were then combined, allowing the calculation of cumulative accessibility scores. Rasterization of the vector data resulted in the index map, offering a spatial analysis of access ease based on transit mode and time.
This project was undertaken in QGIS, following advanced processing models and isochrone algorithms, and utilized batch processing to streamline the generation of multiple time intervals. The TravelTime API's capabilities were essential in creating precise isochrones, which combined with QGIS's processing tools, allows for reliable and reproducible results.
