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<p>Coastal Types: The dataset indicates the sediment composition of a beach at certain transects,
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which are globally spaced shore-normal transects in every 500m. The transects can either labelled as sandy, muddy, vegetated, coastal cliff or other materials.
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This dataset is derived from satellite images and other parameters and generated by using a supervised random forest classifier.
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Details of the methodology can be referred to Breiman et al. (2001).</p>
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<p>The Population: The dataset provides a global population count per pixel at approximately 100m resolution
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and it is based on the United Nation Development Programme (UNDP) 2020 estimates for in total 183 countries.</p>
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<p>Historical Shoreline Change: The dataset provides the annual shoreline position over the period from 1984 to 2021 along 1.8 million transects in the world.
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The transects are 500m spaced shore-normal transects. The position of shoreline is derived from satellite images.
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Details of the methodology can be referred to XXXX.</p>
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<p>SSP: SSP stands for Shared Socioeconomic Pathway, which was introduced in the IPCC 6th Assessment Report (AR6).
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This indicator describes different socioeconomic assumptions, such as population, economic growth, technological development and etc.
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Details can be referred to the AR6.</p>
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<p>RCP: RCP stands for Representative Concentration Pathway, which was introduced in IPCC 5th Assessment Report (AR5).
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RCP4.5 and 8.5 describe scenarios with intermediate or very high greenhouse gas (GHG) emission and other radiative forcings.
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RCP4.5 describes a scenario that the CO2 emission will remain around current levels until 2050 and fall but not reach net zero by 2100.
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RCP8.5 describes a scenario that the CO2 emission will become triple by 2075.</p>
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<p>Sea Level Rise Projection: This is median projections of regional sea level rise from 2020 to 2150, relative to a 1995-2014 baseline.
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This projection data is originally from the AR6. The projections are based on several scenarios, including SSP126, SSP245 and SSP585.
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Details of the projection can be found in XXX.</p>
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<p>Future Shoreline Projections: The average shoreline change rate is based on projection of locations of sandy shorelines relative to their reference locations in RCP4.5 and RCP8.5 scenarios.
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According to Luijendijk et al. (XXXX), the shoreline locations in 2021 and the projected shoreline locations in 2050 and 2100 are defined.
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The average shoreline change rate is calculated based on the spatial distance difference of the shoreline location between two referenced years and divided by the year difference.
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The future shoreline location is estimated based on XXXXX. Details can be found in “XXXX” (Luijendijk et al., XXXX ).
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The erosion and accretion classification system is the same as the one in the historical shoreline change.</p>
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