Mer 19 Sept
Professeur Horacio Samaaniego
Nous avons le plaisir de recevoir le professeur Horacio Samaniego à la Maison de la Télédétection
A partir de 11 h00 en salle Silva
Title :
An Approximation to Understand Urban Segregation. Merging Bigdata Analysis into the Time Geography Analysis framework in Chile.
Abstract:
While segregation is usually evaluated at the residential level, the recent influx of large streams of data describing urbanites’ movement across the city allows to generate detailed descriptions of spatio-temporal segregation patterns across the activity space of individuals. For instance, segregation across the activity space is usually thought to be lower compared to residential segregation given the importance of social complementarity, among other factors, shaping the economies of cities. However, these new dynamic approaches to segregation convey important methodological challenges.
I here propose a methodological framework to investigate segregation during working hours. Our approach combines three well-known mathematical tools: community detection algorithms, segregation metrics, and random walk analysis. Using Santiago (Chile) as a model system, I build a detailed home-work commuting network from a large dataset of mobile phone pings and spatially partitioned the city into several communities to evaluate the probability that two persons at their work location will come from the same community.
While these findings highlights the benefit of developing new approaches to understand dynamic processes in the urban environment, it shows a specific example in which the exposure dimension of segregation is successfully studied using the growingly available streams of highly detailed anonymized mobile phone registries.
I graduated in Ecology at the University of New Mexico, USA in 2007. After a brief post-doctorate in the Department of Computer Science at UNM , I joined in 2008 as an academic at the Faculty of Forestry and Natural Resources of the Austral University of Chile in Valdivia. Between 2010 and 2012 I did a postdoc at the Center for Non Linear Studies at Los Alamos National Laboratory, USA. My interests and research are related to describe and explain dynamics of Complex Systems in ecology and urban systems. Among the latter, understand the relationship between diversity and sustainability to contribute to the development of urban policies that consider the complexity of social and environmental systems. For this, I focus my work on the use of massive data (Big Data) and Ecoinformatics as a multidisciplinary analysis tool.
