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The global mangrove watch - a New 2010 global baseline of mangrove extent

Author

Listed:
  • Bunting, P.
  • Rosenqvist, A.
  • Lucas, R. M.
  • Rebelo, Lisa-Maria
  • Thomas, N.
  • Hardy, A.
  • Itoh, T.
  • Shimada, M.
  • Finlayson, C. M.

Abstract

This study presents a new global baseline of mangrove extent for 2010 and has been released as the first output of the Global Mangrove Watch (GMW) initiative. This is the first study to apply a globally consistent and automated method for mapping mangroves, identifying a global extent of 137,600 km 2 . The overall accuracy for mangrove extent was 94.0% with a 99% likelihood that the true value is between 93.6–94.5%, using 53,878 accuracy points across 20 sites distributed globally. Using the geographic regions of the Ramsar Convention on Wetlands, Asia has the highest proportion of mangroves with 38.7% of the global total, while Latin America and the Caribbean have 20.3%, Africa has 20.0%, Oceania has 11.9%, North America has 8.4% and the European Overseas Territories have 0.7%. The methodology developed is primarily based on the classification of ALOS PALSAR and Landsat sensor data, where a habitat mask was first generated, within which the classification of mangrove was undertaken using the Extremely Randomized Trees classifier. This new globally consistent baseline will also form the basis of a mangrove monitoring system using JAXA JERS-1 SAR, ALOS PALSAR and ALOS-2 PALSAR-2 radar data to assess mangrove change from 1996 to the present. However, when using the product, users should note that a minimum mapping unit of 1 ha is recommended and that the error increases in regions of disturbance and where narrow strips or smaller fragmented areas of mangroves are present. Artefacts due to cloud cover and the Landsat-7 SLC-off error are also present in some areas, particularly regions of West Africa due to the lack of Landsat-5 data and persistence cloud cover. In the future, consideration will be given to the production of a new global baseline based on 10 m Sentinel-2 composites.

Suggested Citation

  • Bunting, P. & Rosenqvist, A. & Lucas, R. M. & Rebelo, Lisa-Maria & Thomas, N. & Hardy, A. & Itoh, T. & Shimada, M. & Finlayson, C. M., 2018. "The global mangrove watch - a New 2010 global baseline of mangrove extent," Papers published in Journals (Open Access), International Water Management Institute, pages 10(10):1-19.
    • Handle: RePEc:iwt:jounls:h049127
    DOI: 10.3390/rs10101669
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    References listed on IDEAS

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    1. Jean-François Pekel & Andrew Cottam & Noel Gorelick & Alan S. Belward, 2016. "High-resolution mapping of global surface water and its long-term changes," Nature, Nature, vol. 540(7633), pages 418-422, December.
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    1. Gloria M. S. Reithmaier & Alex Cabral & Anirban Akhand & Matthew J. Bogard & Alberto V. Borges & Steven Bouillon & David J. Burdige & Mitchel Call & Nengwang Chen & Xiaogang Chen & Luiz C. Cotovicz & , 2023. "Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Shanshan Song & Yali Ding & Wei Li & Yuchen Meng & Jian Zhou & Ruikun Gou & Conghe Zhang & Shengbin Ye & Neil Saintilan & Ken W. Krauss & Stephen Crooks & Shuguo Lv & Guanghui Lin, 2023. "Mangrove reforestation provides greater blue carbon benefit than afforestation for mitigating global climate change," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    3. Daniel Aja & Michael K. Miyittah & Donatus Bapentire Angnuureng, 2022. "Quantifying Mangrove Extent Using a Combination of Optical and Radar Images in a Wetland Complex, Western Region, Ghana," Sustainability, MDPI, vol. 14(24), pages 1-17, December.
    4. Viviana Otero Fadul & Richard Lucas & Ruben Van De Kerchove & Behara Satyanarayana & Husain Mohd-Lokman & Farid Dahdouh-Guebas, 2020. "Spatial analysis of early mangrove regeneration in the Matang Mangrove Forest Reserve, Peninsular Malaysia, using geomatics," ULB Institutional Repository 2013/309086, ULB -- Universite Libre de Bruxelles.
    5. Cuicui Feng & Guanqiong Ye & Jiangning Zeng & Jian Zeng & Qutu Jiang & Liuyue He & Yaowen Zhang & Zhenci Xu, 2023. "Sustainably developing global blue carbon for climate change mitigation and economic benefits through international cooperation," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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