AUTHOR=Schumann Guy J-P. , Bates Paul D. TITLE=The Need for a High-Accuracy, Open-Access Global DEM JOURNAL=Frontiers in Earth Science VOLUME=6 YEAR=2018 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2018.00225 DOI=10.3389/feart.2018.00225 ISSN=2296-6463