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We mapped Low Elevation Coastal Zones at or below 10m in elevation and\nadjacent to the coastline for West Africa, from Senegal to Nigeria. This\nanalysis was conducted using MERIT DEM data, which was created by removing\nmultiple error types from SRTM3 v2.1 and AW3D-30m v1 to reduce vertical height\nbias (Yamakzai et al. 2018). Given this increased vertical accuracy, MERIT DEM\ncan map 10-meter LECZs with an 89% accuracy (Gesch 2018). <o:p></o:p><\/font><\/span><\/p>

To determine the 10-meter LECZ, we identified pixels that had a value less\nthan 10 and were adjacent to the coast or a coastal water body. We also masked\npermanent water bodies from the zone to better visually represent the\nsurrounding land areas most at risk.<\/font><\/span><\/p>

Limitations<\/font><\/span><\/b><\/p>

LIDAR derived Digital Elevation\nModels (DEMs), along with current, bathymetric and storm surge data, is widely\nacknowledged to be the most accurate way of modeling fine-scale SLR (Luger and\nGunduz 2015, Gesch 2018, Kulp and Strauss 2015). Although this is largely\nrecognized as the most accurate approach, LIDAR data is expensive to obtain,\noften unavailable in many parts of the world, and would require a large amount\nof processing power to analyze at the scale of the West African Coastline.\nRemotely sensed, globally available DEMs are also commonly used to map SLR\nvulnerability, although it has been shown that global DEMs are not suitable for\nmapping fine scale sea-level rise over relatively short time horizons with any\nacceptable amount of accuracy (Leon et al. 2014, Gesch 2018). Given these\naccuracy and data availability issues, we were not able to model seal level\nrise itself, but rather were able to identify 10-meter Low Elevation Coastal\nZones (LECZs) for the entire west coast of Africa (Senegal to Nigeria). We also\nhighlighted other key areas within the LECZ that are particularly vulnerable to\nthe impacts of sea level rise for information and planning purposes. <\/span><\/font><\/p>

Map projection : <\/span><\/b>It is currently Africa Albers Equal Area Conic\n(WGS84).<\/span><\/font><\/p>

Data links<\/font><\/span><\/b><\/p>

· <\/span><\/span>MERIT DEM<\/span> :<\/span><\/b> https://hydro.iis.u-tokyo.ac.jp/~yamadai/MERIT_DEM/<\/a><\/span><\/font><\/p>

<!--· <\/span><\/span>https://www.wabicc.org/mdocs-posts/mapping-west-africas-low-elevation-coastal-zones/<\/span><\/a><\/span> <\/span><\/font><\/p>

·   <\/span><\/span>file:///C:/Users/ProDesk%20400/Downloads/Mapping%20West%20Africa&%23039%3Bs%20Low%20Elevation%20Coastal%20Zones.pdf<\/span><\/a><\/span> <\/span><\/font><\/p>

Data\nsource <\/font><\/span><\/b><\/p>

This data layer was developed using MERIT DEM\ndata, which is created <\/span>by removing multiple error types from <\/span>SRTM3\nv2.1 and AW3D-30m v1 to reduce vertical height bias. This dataset was produced\nby Yamakzai et al. 2018.<o:p></o:p><\/span><\/font><\/p>

Citation\n(s)<\/font><\/span><\/b><\/p>

Cori G., 2019.\nMapping weest Africa\u2019s low elevation costal zones. USAID, WA BiCC, Tetra Tech.<\/font><\/span><\/p>

Gesch,\nD., 2018. Best Practices for Elevation-Based Assessments of Sea-Level Rise and\nCoastal Flooding Exposure. Frontiers in Earth Science, 6.<\/font><\/span><\/p>

Gunduz,\nOrhan & Tulger Kara, Gülşah. (2015). \u2018Influence of DEM Resolution on\nGIS-Based Inundation Analysis\u2019. 9th World Congress of the European Water\nResources Association (EWRA<\/i>). İstanbul, Turkey. <\/font><\/span><\/p>

Kulp,\nS. and Strauss, B., 2015. \u2018The Effect Of DEM Quality On Sea Level Rise\nExposure Analysis\u2019. AGU Fall Meeting. 2015. <\/font><\/span><\/p>

Leon,\nJ., Heuvelink, G. and Phinn, S., 2014. Incorporating DEM Uncertainty in Coastal\nInundation Mapping. PLoS ONE, 9(9), p.e108727.<\/font><\/span><\/p>

Yamazaki D., D. Ikeshima, R. Tawatari,\nT. Yamaguchi, F. O'Loughlin, J.C. Neal, C.C. Sampson, S. Kanae & P.D.\nBates. A high accuracy map of global terrain elevations. Geophysical Research\nLetters, vol.44, pp.5844-5853, 2017 doi: 10.1002/2017GL072874.<\/span><\/font><\/p>

Geographic\ncoverage<\/span><\/b>Senegal to\nNigeria.<\/b><\/span><\/font><\/p>

Layer creation date<\/span><\/b> : 7/31/20.<\/span><\/font><\/p>

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n<\/p>

Contacts : <\/span><\/b>Cori Grainger (<\/span>cori.grainger@tetratech.com<\/span><\/a><\/span>), Vaneska Litz (<\/span>vaneska.litz@tetratech.com<\/span><\/a><\/span>), Stephen Kelleher (<\/span>Stephen.Kelleher@wabicc.org<\/span><\/a><\/span>).<\/span><\/font><\/p>

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