Layer: Cartographie_des_zones_basses_de_la_zone

View In: ArcGIS Online Map Viewer

Name: Cartographie_des_zones_basses_de_la_zone_PRCM

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Description: We mapped Low Elevation Coastal Zones at or below 10m in elevation and adjacent to the coastline for West Africa, from Senegal to Nigeria. This analysis was conducted using MERIT DEM data, which was created by removing multiple error types from SRTM3 v2.1 and AW3D-30m v1 to reduce vertical height bias (Yamakzai et al. 2018). Given this increased vertical accuracy, MERIT DEM can map 10-meter LECZs with an 89% accuracy (Gesch 2018). <o:p></o:p>To determine the 10-meter LECZ, we identified pixels that had a value less than 10 and were adjacent to the coast or a coastal water body. We also masked permanent water bodies from the zone to better visually represent the surrounding land areas most at risk.LimitationsLIDAR derived Digital Elevation Models (DEMs), along with current, bathymetric and storm surge data, is widely acknowledged to be the most accurate way of modeling fine-scale SLR (Luger and Gunduz 2015, Gesch 2018, Kulp and Strauss 2015). Although this is largely recognized as the most accurate approach, LIDAR data is expensive to obtain, often unavailable in many parts of the world, and would require a large amount of processing power to analyze at the scale of the West African Coastline. Remotely sensed, globally available DEMs are also commonly used to map SLR vulnerability, although it has been shown that global DEMs are not suitable for mapping fine scale sea-level rise over relatively short time horizons with any acceptable amount of accuracy (Leon et al. 2014, Gesch 2018). Given these accuracy and data availability issues, we were not able to model seal level rise itself, but rather were able to identify 10-meter Low Elevation Coastal Zones (LECZs) for the entire west coast of Africa (Senegal to Nigeria). We also highlighted other key areas within the LECZ that are particularly vulnerable to the impacts of sea level rise for information and planning purposes. Map projection : It is currently Africa Albers Equal Area Conic (WGS84).Data links· MERIT DEM : <a href="https://hydro.iis.u-tokyo.ac.jp/~yamadai/MERIT_DEM/">https://hydro.iis.u-tokyo.ac.jp/~yamadai/MERIT_DEM/</a><!--· <a href="https://www.wabicc.org/mdocs-posts/mapping-west-africas-low-elevation-coastal-zones/">https://www.wabicc.org/mdocs-posts/mapping-west-africas-low-elevation-coastal-zones/</a> · <a href>file:///C:/Users/ProDesk%20400/Downloads/Mapping%20West%20Africa&%23039%3Bs%20Low%20Elevation%20Coastal%20Zones.pdf</a> Data source This data layer was developed using MERIT DEM data, which is created by removing multiple error types from SRTM3 v2.1 and AW3D-30m v1 to reduce vertical height bias. This dataset was produced by Yamakzai et al. 2018.<o:p></o:p>Citation (s)Cori G., 2019. Mapping weest Africa’s low elevation costal zones. USAID, WA BiCC, Tetra Tech.Gesch, D., 2018. Best Practices for Elevation-Based Assessments of Sea-Level Rise and Coastal Flooding Exposure. Frontiers in Earth Science, 6.Gunduz, Orhan & Tulger Kara, Gülşah. (2015). ‘Influence of DEM Resolution on GIS-Based Inundation Analysis’. 9th World Congress of the European Water Resources Association (EWRA). İstanbul, Turkey. Kulp, S. and Strauss, B., 2015. ‘The Effect Of DEM Quality On Sea Level Rise Exposure Analysis’. AGU Fall Meeting. 2015. Leon, J., Heuvelink, G. and Phinn, S., 2014. Incorporating DEM Uncertainty in Coastal Inundation Mapping. PLoS ONE, 9(9), p.e108727.Yamazaki D., D. Ikeshima, R. Tawatari, T. Yamaguchi, F. O'Loughlin, J.C. Neal, C.C. Sampson, S. Kanae & P.D. Bates. A high accuracy map of global terrain elevations. Geophysical Research Letters, vol.44, pp.5844-5853, 2017 doi: 10.1002/2017GL072874.Geographic coverageSenegal to Nigeria.Layer creation date : 7/31/20. Contacts : Cori Grainger (<a href="mailto:cori.grainger@tetratech.com">cori.grainger@tetratech.com</a>), Vaneska Litz (<a href="mailto:vaneska.litz@tetratech.com">vaneska.litz@tetratech.com</a>), Stephen Kelleher (<a href="mailto:Stephen.Kelleher@wabicc.org">Stephen.Kelleher@wabicc.org</a>).

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Layer: Cartographie_des_zones_basses_de_la_zone_PRCM (ID: 25)