The NASA IceBridge Narrow Swath ATM L1B Elevation and Return Strength data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 22 November 2017.
This data set contains spot elevation measurements of Greenland, Arctic, and Antarctic sea ice acquired using the NASA Airborne Topographic Mapper (ATM) narrow-swath instrumentation.
Data Set DOI: https://doi.org/10.5067/CXEQS8KVIXEI