IceBridge Preliminary ATM L1B Elevation and Return Strength, Version 1

This data set contained preliminary spot elevation measurements of Arctic sea ice and Greenland ice surface for four days in April 2019, acquired using the NASA Airborne Topographic Mapper (ATM) instrumentation. The data were collected as part of Operation IceBridge funded aircraft survey campaigns.

Note: These data were released solely to assess and validate the performance of the ATLAS/ICESat-2 instrument and algorithm. They were not subjected to the same refinement and quality control measures as the IceBridge ATM L1B Elevation and Return Strength (ILATM1B) product and may have contained errors. Once NSIDC released the final ILATM1B data in March 2021, these preliminary data were retired and are no longer available for download.