de Havilland Twin-Otter (IMAGE) Naval Research Laboratory Caption The NRL team, using a specially equipped de Havilland DHC-6 Twin Otter aircraft (similar to aircraft shown), collect data to aid in the validation and calibration of data captured by the ESA Cryosat-2 satellite. Credit NASA Glenn Research Center Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.