Chamoli Disaster Post-event 2-m DEM Composite (February 10-11, 2021) and Difference Map, Version 1

This data set contains 2-m resolution DEM composites and a DEM difference map over the Chamoli disaster area in Uttarakhand, India, where on 7 February 2021 a glacier burst led to a massive flood. These post-event DEMs were constructed from monoscopic Maxar/DigitalGlobe WorldView-2, WorldView-3, and GeoEye-1 images acquired on 10 February 2021 and 11 February 2021, and one DEM was generated from Pléiades-HR1B in-track stereo images acquired on 10 February 2021. The DEM difference map was created from the September 2015 weighted-mean DEM composite and the 10-11 February 2021 weighted-mean DEM composite. The September 2015 pre-event DEM is available as a separate data set (https://nsidc.org/data/HMA2_CPRE).本数据集涵盖印度北阿坎德邦查莫利灾区的2米分辨率数字高程模型（Digital Elevation Model，DEM）合成产品与DEM差值图。2021年2月7日，该区域发生冰川溃决并引发特大洪水。这些灾后DEM合成产品均由2021年2月10日及11日获取的马克萨/数字地球（Maxar/DigitalGlobe）公司WorldView-2、WorldView-3与GeoEye-1单视影像构建而成，另有1景DEM由2021年2月10日获取的Pléiades-HR1B沿轨立体影像生成。本次DEM差值图由2015年9月的加权平均DEM合成产品与2021年2月10-11日的加权平均DEM合成产品制作而成。 2015年9月的灾前DEM可作为独立数据集获取，链接为https://nsidc.org/data/HMA2_CPRE。