Journal
REMOTE SENSING OF ENVIRONMENT
Volume 182, Issue -, Pages 49-59Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2016.04.018
Keywords
SRTM; Vegetation correction; Digital Elevation Model; DEM; ICESat; Bare-Earth
Funding
- Leverhulme Trust grant [RPG-409]
- NASA SWOT Science Definition Team grant [NNX13AD96G]
- Ohio State University
- UK Natural Environment Research Council grant [NE/M007766/1]
- NERC [NE/M007766/1] Funding Source: UKRI
- Natural Environment Research Council [NE/M007766/1] Funding Source: researchfish
- NASA [475379, NNX13AD96G] Funding Source: Federal RePORTER
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We develop the first global 'Bare-Earth' Digital Elevation Model (DEM) based on the Shuttle Radar Topography Mission (SRTM) for all landmasses between 60N and 54S. Our new 'Bare-Earth' SRTM DEM combines multiple remote sensing datasets, including point-ground elevations from NASA's laser altimeter ICESat, a database of percentage of tree cover from the MODIS satellite as a proxy for penetration depth of SRTM and a global vegetation height map in order to remove the vegetation artefacts present in the original SRTM DEM. We test multiple methods of removing vegetation artefacts and investigate the use of regionalization. Our final 'Bare-Earth' SRTM product shows global improvements greater than 10 m in the bias over the original SRTM DEM in vegetated areas compared with ground elevations determined from ICESat data with a significant reduction in the root mean square error from over 14 m to 6 m globally. Therefore, our DEM will be valuable for any global applications, such as large scale flood modelling requiring a 'Bare-Earth' DEM. (C) 2016 The Authors. Published by Elsevier Inc.
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