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Coastal proximity of populations in 22 Pacific Island Countries and Territories

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  • Neil L Andrew
  • Phil Bright
  • Luis de la Rua
  • Shwu Jiau Teoh
  • Mathew Vickers

Abstract

The coastal zones of Small Island States are hotspots of human habitation and economic endeavour. In the Pacific region, as elsewhere, there are large gaps in understandings of the exposure and vulnerability of people in coastal zones. The 22 Pacific Countries and Territories (PICTs) are poorly represented in global analyses of vulnerability to seaward risks. We combine several data sources to estimate populations to zones 1, 5 and 10 km from the coastline in each of the PICTs. Regional patterns in the proximity of Pacific people to the coast are dominated by Papua New Guinea. Overall, ca. half the population of the Pacific resides within 10 km of the coast but this jumps to 97% when Papua New Guinea is excluded. A quarter of Pacific people live within 1 km of the coast, but without PNG this increases to slightly more than half. Excluding PNG, 90% of Pacific Islanders live within 5 km of the coast. All of the population in the coral atoll nations of Tokelau and Tuvalu live within a km of the ocean. Results using two global datasets, the SEDAC-CIESIN Gridded Population of the World v4 (GPWv4) and the Oak Ridge National Laboratory Landscan differed: Landscan under-dispersed population, overestimating numbers in urban centres and underestimating population in rural areas and GPWv4 over-dispersed the population. In addition to errors introduced by the allocation models of the two methods, errors were introduced as artefacts of allocating households to 1 km x 1 km grid cell data (30 arc–seconds) to polygons. The limited utility of LandScan and GPWv4 in advancing this analysis may be overcome with more spatially resolved census data and the inclusion of elevation above sea level as an important dimension of vulnerability.

Suggested Citation

  • Neil L Andrew & Phil Bright & Luis de la Rua & Shwu Jiau Teoh & Mathew Vickers, 2019. "Coastal proximity of populations in 22 Pacific Island Countries and Territories," PLOS ONE, Public Library of Science, vol. 14(9), pages 1-15, September.
    • Handle: RePEc:plo:pone00:0223249
    DOI: 10.1371/journal.pone.0223249
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    References listed on IDEAS

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    1. Barbara Neumann & Athanasios T Vafeidis & Juliane Zimmermann & Robert J Nicholls, 2015. "Future Coastal Population Growth and Exposure to Sea-Level Rise and Coastal Flooding - A Global Assessment," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-34, March.
    2. N. A. Wardrop & W. C. Jochem & T. J. Bird & H. R. Chamberlain & D. Clarke & D. Kerr & L. Bengtsson & S. Juran & V. Seaman & A. J. Tatem, 2018. "Spatially disaggregated population estimates in the absence of national population and housing census data," Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, vol. 115(14), pages 3529-3537, April.
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