Update for NASA IceBridge ATM L2 Data

The NASA IceBridge ATM L2 Icessn Elevation, Slope, and Roughness, Version 2 data set now includes data for 2014 Arctic. This data set contains resampled and smoothed elevation measurements of Arctic and Antarctic sea ice, and Greenland, Antarctic Peninsula, and West Antarctic region land 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 L2 catalog page.