Analysis Centrality and Resilience

This section describes the lane of the workflow that analyse centrality and resilience

• Origin-Destination matrix is the activity where we sampled Origin and Destination (OD) required to calculate the connectvity based on the edge betweenness centrality.
• We calculate connectivity using the centrality indicator edge betweenness. A weighted sampling based on the built-up volumen on a intracity scale for each municipality and on a core metropolitan scale for the whole AoI identified urban arteries of the road network.
• We calculate redundancy on the hospital access using regular sampling on isochrones from each of the hospitals found in the AoI.

Fig.1 The lane analyse centrality and resilience calculated the connectivity of the road network and the accesibility of the healthcare facilities. For the centrality, we used a weighted OD matrix based on the building density identifying the urban arteries. For the hospital accesibility, we used isochrones from ORS and a regular OD to measure the resilience component of redundancy.

The Research Questions (RQ) asked in the introduction were the following:

• RQ1: “How is road connectivity affected in pre-disasteer and post-disaster scenarios based on edge betweenness centrality?”.
  The centrality results, which showed the main urban arteries supported the answers given.

• RQ2: “Which municipalities were most affected by the flood based on the edge betweenness centrality metric?”.
  The aggregation of the centrality results on both scales provided the basis for the answer to this RQ.

• RQ3: Which healthcare facility was less resilient in terms of lack of redundancy?.
  The comparison between three alternative paths to the hospitals’ access revealed their lack of redundancy, giving the argumentation to answer this RQ.