Performance of ICESat‐2 Precision Pointing Determination

Global elevations are critical to understanding the Earth's dynamic processes and changing climate. These measurements best acquired from a space-based vantage point most accurate using laser altimetry technology. However, accuracy associated with elevation retrievals relies heavily on ability precisely determine pointing angle of beams satellite illuminated spot surface. The Ice, Cloud, land Elevation Satellite 2 (ICESat-2) has system consisting instruments that support determination direction through process called Precision Pointing Determination (PPD). In this paper, we describe PPD conceptual implementation, instrument details, data processing approach, calibration/validation techniques, performance assessment. We show successfully achieved allocated goal essential meeting ICESat-2 geolocation mission requirement.