https://www.youtube.com/watch?v=lTlTvk355eQ
https://dlmultimedia.esa.int/download/public/videos/2020/09/019/2009_019_AR_EN.mp4
https://www.youtube.com/watch?v=lTlTvk355eQ
Sentinel-6 fires radar pulses at the ocean and times the echo to measure sea-surface height.
That altimetry continues the Jason series record of global sea-level change.