Seeing Informal Settlements: the Policy Implications of Different Techniques to Identify Urban Growth Patterns From Satellite Imagery Using the Case of Informal Construction in Ho Chi Minh City

SLAB Working Paper Series 2017:1

31 Pages Posted: 4 Jun 2018  

Arthur Acolin

University of Washington - College of Built Environments

Annette M. Kim

University of Southern California

Date Written: 2017

Abstract

In the midst of urban policy institutions taking greater advantage of technological advances for generating data, this paper analyzes the current state of using satellite imagery to monitor informal settlement patterns. Using the issue of informal settlements in rapid urbanization, this paper finds that policy-oriented research agendas needs further development as much as the techniques. The paper first presents an example of how informal urbanization can be detected even with older imagery combined with fieldwork by applying thresholding and texture analysis of remote sensing imagery developed by Kim et al (2004) for data from 1994 and 2001 for Ho Chi Min City, Vietnam. Then this study compares our identification of urbanized areas in Ho Chi Minh City with those identified for 2000 by Angel et al. (2005) and the World Bank (2015). We find that while all three converge on classifying urban areas in the city’s core, in the periphery each study’s methods systematically identify different kinds of urban spatial patterns. These differences suggest the importance of customizing algorithms to account for the local context and testing through ground-truthing to establish their accuracy. These observations also point to a need for a discussion between urbanization scholars about developing standards in reporting data, methods, and findings. Our study suggests that analysts need to keep a critical eye for marginalized populations when using automated interpretation of satellite images to establish urban settlement patterns. Contextual knowledge gained through fieldwork and collaborative partnerships is necessary to not systematically overlook informal settlements which could have important implications for disaster and resilience, resettlement, climate change adaptation, and public finance policies and planning.

Keywords: Urban Expansion, Informal Settlements, Inclusion, Remote Sensing Imagery, Vietnam, Asia

JEL Classification: O18, R11, R14, R52, R58

Suggested Citation

Acolin, Arthur and Kim, Annette M., Seeing Informal Settlements: the Policy Implications of Different Techniques to Identify Urban Growth Patterns From Satellite Imagery Using the Case of Informal Construction in Ho Chi Minh City (2017). SLAB Working Paper Series 2017:1. Available at SSRN: https://ssrn.com/abstract=3184364 or http://dx.doi.org/10.2139/ssrn.3184364

Arthur Acolin (Contact Author)

University of Washington - College of Built Environments ( email )

224 Gould Hall
Box 355726
Seattle, WA 98195
United States

Annette M. Kim

University of Southern California ( email )

2250 Alcazar Street
Los Angeles, CA 90089
United States

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