AUTHOR=Chen Fang , Haritashya Umesh K. , Prakash Mahesh , Wang Lei TITLE=Editorial: Big Earth Data for Disaster Risk Reduction JOURNAL=Frontiers in Earth Science VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2021.727547 DOI=10.3389/feart.2021.727547 ISSN=2296-6463