242150 Long-term land use change in Puerto Maldonado, Peru and implications for dengue surveillance and control

Monday, October 31, 2011

Laura Gast, MPH CPH , School or Public Health, Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL
Sarah Parcak, PhD , Department of History & Anthropology, University of Alabama at Birmingham, Birmingham, AL
Background: Environmental factors remain a major cause of morbidity and mortality throughout the world. Anthropogenic pressures, especially rapid unplanned urbanization, are linked to crowding, air pollution, inadequate water and sanitation systems, and poor housing conditions, which are directly related to poor health conditions. Remote sensing technologies have the ability to measure and predict ground-level environmental changes that are known to contribute to increased diseased incidence. In addition, they can distinguish the ground conditions most likely to create ideal breeding habitats for vectors of diseases such as dengue.

Objective: (1)To characterize land-use change for the region of Puerto Maldonado, Peru between 1986 and 2008, using Landsat TM+ and ASTER imagery; and (2) to describe the implications for dengue surveillance and control.

Methods: The project acquired six satellite images of the study; three Landsat TM+ images (1986, 1996, and 2005) and three ASTER images (2002, 2006, and 2008). Using a supervised pixel-based classification algorithm, we developed a land-use / land-cover classification map for each image and calculated change over time for each land class. Classes were verified through ground-truthing performed in May 2011. We quantified accuracy of the classification in terms of producer's (Type I) and user's (Type II) accuracy, and Cohen's Kappa.

Results: Significant changes in land cover occurred over the study period. The study showed an increase in urban, rangeland/agriculture, and barren land areas, and decreased forested areas between 1986-2005 and 2002-2008.

Conclusions: This study has important implications for the development of novel, cost-effective and efficient broad-scale surveillance technologies for inter-epidemic periods.

Learning Areas:
Protection of the public in relation to communicable diseases including prevention or control
Public health or related research

Learning Objectives:
(a) Describe implications of rapid, unplanned urbanization on dengue incidence; (b) Discuss the utility of remote sensing satellite analysis in the development of vector-borne disease surveillance systems; and (c) Describe the land use change for the region of Puerto Maldonado, Peru from 1986-2008

Keywords: Surveillance, International Health

Presenting author's disclosure statement:

Qualified on the content I am responsible for because: I am a doctoral-level graduate student specializing in international vector-borne disease surveillance and management. I designed and executed this research as part of my dissertation research.
Any relevant financial relationships? No

I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.