Update for NASA IceBridge ATM L1B Data

The NASA IceBridge ATM L1B Elevation and Return Strength, Version 2 data set now includes data for 2014 Arctic. This data set contains spot elevation measurements of Arctic and Antarctic sea ice, and Greenland, Antarctic Peninsula, and West Antarctic region ice surface acquired using the NASA Airborne Topographic Mapper (ATM) instrumentation. For further information and to access the data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), see the IceBridge ATM L1B catalog page.