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This paper presents the assessment of altimetric data from Sentinel-3Asatellite operating in Synthetic Aperture Radar (SAR) mode for sea levelresearch studies and applications over the largest archipelagos at SoutheastAsia. Both qualitative and quantitative assessments are conducted by analysingthe physical shapes of waveforms, comparing with quasi-independent geoidalheight data and independent tide gauge measurements. The results identified thepercentage of ocean like and non-ocean like waveforms are 91% and 9%,respectively. Off 9% of non-ocean like waveforms, the major class is multi-peak(7%) followed by the quasi-specular waveforms (2%) observed near the coastline(<10 km). Ocean like waveforms typically appear beyond 500 m from thecoastline. When comparing with geoidal heights and tide gauge measurements, theperformance of sea levels from several retrackers are assessed. The SAMOSA+retracker outperforms other retrackers (i.e. sub-waveform and modifiedthreshold retrackers with 30%, 20% and 10%). That is, the standard deviation ofdifferences against geoidal heights, and the temporal correlation against tidegauges are superior in most cases. In terms of root mean square error (RMSE),all retrackers are ranging with RMSE <20 cm in all cases. It can be concludedthat in general, the SAMOSA+ retracked sea levels are accurate over thecomplicated regions at the Southeast Asia.

Assessment of Retracked Ocean Parameters from Sentinel 3A Synthetic Aperture Radar (SAR) Mode Altimetry over the Marginal Seas at Southeast Asia