{'fraction_non_alphanumeric': 0.02943650126156434, 'fraction_numerical': 0.010933557611438183, 'mean_word_length': 5.502732240437158, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Ice‐sheet elevations from across‐track processing of airborne interferometric radar altimetry

Interferometric Radar Altimeters (IRA's) use dual receive antennas to overcome one of the spatial limitations of pulse‐limited altimeters. In a conventional IRA measurement, the range and across‐track direction of a scatterer are determined using the phase difference between the antennas. We demonstrate a method of determining multiple elevation points across a swath orthogonal to the instrument ground track in regions of steep terrain, such as ice‐sheet margins. We use data from an airborne IRA (a prototype of the CryoSat‐2 instrument), and compare the results to simultaneous Airborne Laser Scanner (ALS) observations. This application results in a 75‐fold increase in measurement density compared to conventional radar altimetry. Along a ∼2.5 km ground track, the RMS departure between the IRA‐ and ALS‐derived measurements was 1.67 m. Based on our result, although our approach is limited to areas of relatively steep slope, a 25‐ to 75‐fold increase in elevation measurements could be achieved in coastal regions of Antarctica and Greenland with similar processing of CryoSat‐2 data.