Satellite imagery technology in public health: analysis of site catchment areas for assessment of poliovirus circulation in Nigeria and Niger

  • Marina Takane | takanem@who.int World Health Organization, Geneva, Switzerland.
  • Shizu Yabe Japan Aerospace Exploration Agency, Tokyo, Japan.
  • Yumiko Tateshita Japan Aerospace Exploration Agency, Tokyo, Japan.
  • Yusuke Kobayashi Remote Sensing Technology Center of Japan, Tokyo, Japan.
  • Akihiko Hino Remote Sensing Technology Center of Japan, Tokyo, Japan.
  • Kazuo Isono Remote Sensing Technology Center of Japan, Tokyo, Japan.
  • Hiromasa Okayasu World Health Organization, Geneva, Switzerland.
  • Ousmane M. Diop World Health Organization, Geneva, Switzerland.
  • Takeo Tadono Japan Aerospace Exploration Agency, Tokyo, Japan.

Abstract

Environmental surveillance supplements the surveillance of acute flaccid paralysis by monitoring wastewater for poliovirus circulation. Building on previous work, we analysed wastewater flow to optimise selection and placement of sampling sites with higher digital surface model (DSM) resolution. The newly developed 5-m mesh DSM from the panchromatic, remote-sensing instruments for stereo mapping on-board the Japanese advanced land observing satellite was used to estimate catchment areas and flow of sewage water based on terrain topography. Optimal sampling sites for environmental surveillance were identified to maximise sensitivity to poliovirus circulation. Population data were overlaid to prioritise selection of catchment areas with dense populations. The results for Kano City, Nigeria were compared with an analysis based on existing 30- and 90-m mesh digital elevation model (DEM). Analysis based on 5-m mesh DSM was also conducted for three cities in Niger to prioritise the selection of new sites. The analysis demonstrated the feasibility of using DSMs to estimate catchment areas and population size for programme planning and outbreak response with respect to polio. Alternative sampling points in Kano City that would cover a greater population size have been identified and potential sampling sites in Niger are proposed. Comparison with lower-resolution DEMs suggests that the use of a 5-m mesh DSMs would be useful where the terrain is flat or includes small-scale topographic changes not captured by 30-m data searches.

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Author Biographies

Marina Takane, World Health Organization, Geneva

Department of Public Health, Environmental and Social Determinants of Health (PHE), Water, Sanitation, Hygiene and Health (WSH) unit

 

 
Hiromasa Okayasu, World Health Organization, Geneva
Department of Polio Operations and Research
Ousmane M. Diop, World Health Organization, Geneva

Department of Polio Operations and Research 

Coordinator Global Polio Laboratory Network 

Published
2016-11-21
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Original Articles
Keywords:
Environment surveillance, Digital elevation models, Poliovirus, Surface water hydrology, Satellite remote sensing
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How to Cite
Takane, M., Yabe, S., Tateshita, Y., Kobayashi, Y., Hino, A., Isono, K., Okayasu, H., Diop, O. M., & Tadono, T. (2016). Satellite imagery technology in public health: analysis of site catchment areas for assessment of poliovirus circulation in Nigeria and Niger. Geospatial Health, 11(3). https://doi.org/10.4081/gh.2016.462