10 Minute Towns |Access i b i l i t y & Framework Repor t
3.4 Catchment Analysis
3.4.1 Baseline (Existing Network) Upon verification of the street network and the facilities dataset, a catchment analysis for each of the three towns was undertaken using ArcGIS. The areas of each town within the 5 and 10 minutes walking and cycling catchments from each type of facility was determined, according to the categories outlined in Section 3.1. Once the routable (i.e. end-to-end) network has been created, the catchment analysis of facilities in the given town can be conducted. The points representing the facilities of interest are defined, and then the parameters for the catchment analysis are specified, such as the time intervals (5 and 10 minutes in this case) and the modes (walking and cycling). The analysis is then run, determining which areas can be accessed from one or more facilities within the given time interval by the given mode, and polygons representing the catchment are produced. These can then be inserted into maps for visualisation or used to calculate the number of people resident or employed within the catchment. The latter is conducted by using the catchment areas to clip 2016 Census data for Small Areas and Workplace Zones, available from the Central Statistics Office. 3.4.2 Proposed Improvement Network A similar approach using the baseline street network, facilities dataset and the proposed improvement links for the purposes of a catchment in ArcGIS. These were compared against the baseline catchment analysis to understand if the proposed improvement links would result in wider walking and cycling catchments within 5 to 10 mins from each type of facility.
Presentation College
Gaelcholáiste Cheatharlach
å
å
ent
0
0.125
0.25
©
19
Made with FlippingBook flipbook maker