Update for NASA IceBridge POS/AV L1B Data

The NASA IceBridge POS/AV L1B Corrected Position and Attitude Data set now includes data for Antarctica 2014. This data set contains georeferencing data from the Applanix 510 POS AV system flown with the Digital Mapping System (DMS) and other instruments over Greenland and Antarctica. 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 POS/AV L1B landing page.