Abstract:We select four waveform retrackers including SAR multi-threshold, ICE1, IceSheet and SAMOSA, to retrack the Sentinel-3A SAR waveforms in the coastal areas. We then analyze the accuracy of the four retrackers within 20 km offshore by comparison with observations from 27 tide gauges. The results show that the SAR multi-threshold retracker can retain the most valid data, and obtain the highest correlation as well as the smallest root mean square error of difference between the derived sea surface heights and the tide gauge sea levels within 6 km offshore. The SAMOSA retracker has the highest stability related to the geoid beyond 5 km from the shore, which can provide high-precision sea surface height in open ocean.
GAO Xianwen,JIN Taoyong,HUANG Hailan. Analysis on the Accuracy of Waveform Retracking for the Coastal Synthetic Aperture Radar Altimeter Data[J]. jgg, 2021, 41(1): 56-62.