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Measuring maritime search and rescue (SAR) accessibility using an improved spatiotemporal two-step floating catchment area method: A case study in the South China Sea

Author

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  • Wang, Yixuan
  • Han, Yu

Abstract

Accessibility is a crucial metric for evaluating the effectiveness and disparity of search and rescue (SAR) services. Traditional models of accessibility are typically focused on land-based scenarios, often overlooking the unique challenges posed by complex, dynamic maritime emergencies. To bridge this gap, this study introduces an improved spatiotemporal two-step floating catchment area (ST-2SFCA) method, specifically designed to assess SAR accessibility in maritime contexts. The method simultaneously considers various time-dependent factors, including the SAR demand, rescue supply, and oceanic conditions, alongside typical normal or extreme oceanic scenarios. Geographic Information System (GIS)-based techniques are combined with diverse, spatiotemporal SAR datasets—including ship traffic flow data, incident records, rescue base and vessel parameters, and wind and wave data—to refine calculations of response times, supply-to-demand ratios, and overall accessibility. A case study in the South China Sea region across five countries—China, Vietnam, the Philippines, Singapore, and Malaysia—examines our proposed method's applicability and effectiveness. Moreover, the results reveal that ignoring dynamic supply-demand interactions and oceanic influences can lead to inaccurate SAR accessibility estimates, potentially misleading stakeholders. These findings provide insights for policymakers, improving the understanding of dynamic SAR performance, offering recommendation for enhancing SAR systems, and supporting regional cooperation among nations.

Suggested Citation

  • Wang, Yixuan & Han, Yu, 2025. "Measuring maritime search and rescue (SAR) accessibility using an improved spatiotemporal two-step floating catchment area method: A case study in the South China Sea," Journal of Transport Geography, Elsevier, vol. 124(C).
    • Handle: RePEc:eee:jotrge:v:124:y:2025:i:c:s0966692325000468
    DOI: 10.1016/j.jtrangeo.2025.104155
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    1. Jin, Tanhua & Cheng, Long & Wang, Kailai & Cao, Jun & Huang, Haosheng & Witlox, Frank, 2022. "Examining equity in accessibility to multi-tier healthcare services across different income households using estimated travel time," Transport Policy, Elsevier, vol. 121(C), pages 1-13.
    2. Wu, Zhongqi & Jiang, Hui & Zhou, Yangye & Li, Haoyan, 2024. "Enhancing emergency medical service location model for spatial accessibility and equity under random demand and travel time," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 185(C).
    3. Alam, Md. Shaharier & Kim, Kyusik & Horner, Mark W. & Alisan, Onur & Antwi, Richard & Ozguven, Eren Erman, 2024. "Large-scale modeling of hurricane flooding and disrupted infrastructure impacts on accessibility to critical facilities," Journal of Transport Geography, Elsevier, vol. 116(C).
    4. Lope, Dinah Jane & Dolgun, Anil, 2020. "Measuring the inequality of accessible trams in Melbourne," Journal of Transport Geography, Elsevier, vol. 83(C).
    5. Dolejš, Martin & Purchard, Jan & Javorčák, Adam, 2020. "Generating a spatial coverage plan for the emergency medical service on a regional scale: Empirical versus random forest modelling approach," Journal of Transport Geography, Elsevier, vol. 89(C).
    6. Javanmard, Reyhane & Lee, Jinhyung & Kim, Kyusik & Park, Jinwoo & Diab, Ehab, 2024. "Evaluating the impacts of supply-demand dynamics and distance decay effects on public transit project assessment: A study of healthcare accessibility and inequalities," Journal of Transport Geography, Elsevier, vol. 116(C).
    7. Stępniak, Marcin & Pritchard, John P. & Geurs, Karst T. & Goliszek, Sławomir, 2019. "The impact of temporal resolution on public transport accessibility measurement: Review and case study in Poland," Journal of Transport Geography, Elsevier, vol. 75(C), pages 8-24.
    8. Wenhao Yu & Yaya Huang & Yujie Chen & Zelong Xia, 2022. "Accessibility analysis of urban fire stations within communities: a fine-scale perspective," Journal of Geographical Systems, Springer, vol. 24(4), pages 611-640, October.
    9. Jiang, Huaxiong & Wang, Yuxiao & Ma, Wei & Wang, Jiao'’e & Zhang, Mengmeng, 2024. "Unlocking the nonlinear Nexus: Accessibility of emergency resource and resident participation in flood response," Journal of Transport Geography, Elsevier, vol. 118(C).
    10. Bimpou, Konstantina & Ferguson, Neil S., 2020. "Dynamic accessibility: Incorporating day-to-day travel time reliability into accessibility measurement," Journal of Transport Geography, Elsevier, vol. 89(C).
    11. Liu, Luyu & Porr, Adam & Miller, Harvey J., 2024. "Measuring the impacts of disruptions on public transit accessibility and reliability," Journal of Transport Geography, Elsevier, vol. 114(C).
    12. KC, Kiran & Corcoran, Jonathan & Chhetri, Prem, 2020. "Measuring the spatial accessibility to fire stations using enhanced floating catchment method," Socio-Economic Planning Sciences, Elsevier, vol. 69(C).
    13. Chen, Yue & Jia, Shunping & Xu, Qi & Xiao, Zhongsheng & Zhang, Shujing, 2023. "Measuring the dynamic accessibility to COVID-19 testing sites in the 15-min city: A focus on service congestion and mobility difference," Journal of Transport Geography, Elsevier, vol. 111(C).
    14. Singh, Shivendu Shekhar & Sarkar, Basudatta, 2022. "Cumulative opportunity-based accessibility measurement framework in rural India," Transport Policy, Elsevier, vol. 117(C), pages 138-151.
    15. van Wee, Bert & Witlox, Frank, 2021. "COVID-19 and its long-term effects on activity participation and travel behaviour: A multiperspective view," Journal of Transport Geography, Elsevier, vol. 95(C).
    16. Guo, Jianke & Wang, Ziqi & Yu, Xuhui, 2022. "Accessibility measurement of China's coastal ports from a land-sea coordination perspective - An empirical study," Journal of Transport Geography, Elsevier, vol. 105(C).
    17. Tsang, Michele & Scott, Darren M., 2020. "An integrated approach to modeling the impact of floods on emergency services: A case study of Calgary, Alberta," Journal of Transport Geography, Elsevier, vol. 86(C).
    18. Neutens, Tijs, 2015. "Accessibility, equity and health care: review and research directions for transport geographers," Journal of Transport Geography, Elsevier, vol. 43(C), pages 14-27.
    19. Thitithep Sitthiyot & Kanyarat Holasut, 2020. "A simple method for measuring inequality," Palgrave Communications, Palgrave Macmillan, vol. 6(1), pages 1-9, December.
    20. Yulai Wan & Anming Zhang & Kevin X Li, 2018. "Port competition with accessibility and congestion: a theoretical framework and literature review on empirical studies," Maritime Policy & Management, Taylor & Francis Journals, vol. 45(2), pages 239-259, February.
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