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\begin{document}

\title{A new perspective of assessing flood impact with daily nighttime light
remote sensing data}



\author[1]{Yang HU}%
\author[2]{Dai Yamazaki}%
\author[1]{Xudong Zhou}%
\author[1]{Gang Zhao}%
\affil[1]{The University of Tokyo}%
\affil[2]{University of Tokyo}%


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  \date{May 18, 2024}


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\begin{abstract}
Flooding leads to disastrous impacts on human society and activities
worldwide, including damage to physical assets and interruptions to
daily activities. However, evaluation for such impacts remains
challenging, particularly beyond inundation zones, due to the
difficulties in monitoring human activities on a global scale. Nighttime
light (NTL) remote sensing data provides a unique perspective for human
activities on a large scale, reflecting variations in light intensity
caused by flood impact. Here we show the possibility of using a
high-quality NTL dataset to assess flood impact on human society and
activities. Indices providing impact severity and duration were
generated with NTL as proxies for flood impact on pixel scale. Results
show the consistency of NTL-derived and reported impact duration for
five selected cases, which confirms the reliability of NTL flood impact.
A large portion (\textgreater{} 96\%) of NTL-based affected areas did
not overlap with the satellite-based inundation area for 99 cases in
2013, indicating the unique value of NTL in assessing flood impact
beyond inundation. The NTL flood impact indices were mapped at 15
arc-second spatial resolution for 876 events on a global scale from 2013
to 2021. Then, administrative-level characteristics of NTL flood impact
were compared at a global scale. It was found that lower developed
regions exhibit higher vulnerability and challenge in recovery, and are
more likely to experience extremely serious and long-lasting impacts
compared to higher developed areasverall, using NTL data, in addition to
conventional inundation-based methods, offers an innovative perspective
on flood impact evaluation.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Manuscript.docx`  available at \url{https://authorea.com/users/762253/articles/739034-a-new-perspective-of-assessing-flood-impact-with-daily-nighttime-light-remote-sensing-data}

\textbf{Hosted file}

\verb`Supplementary.docx`  available at \url{https://authorea.com/users/762253/articles/739034-a-new-perspective-of-assessing-flood-impact-with-daily-nighttime-light-remote-sensing-data}

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