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. 2023 May 3;10:251. doi: 10.1038/s41597-023-02160-9

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Validation of the instrument v2021 against satellite measurements, reproduced from³⁸. Top: drift trajectory of a freely drifting, open water version of the instrument v2021 (black), and illustration of satellite swaths intersecting the trajectory over the drift period (colored point clouds). Bottom: comparison of the significant wave height (SWH) reported from the v2021 (nicknamed “floatenstein”), with satellite measurements from a variety of satellites. SWH comparison between the v2021 and the satellite measurements are in agreement, with the measurements from the v2021 always falling within the spread for each satellite measurement swath. While this is obtained from a deployment performed in the Caribbeans, this is a validation of the correct functioning of the wave measurement routines. The satellites used are: s3a: Sentinel-3A; s3b: Sentinel-3B; c2: CryoSat-2; j3: Jason-3: al: SARAL/ALtiKa; cfo: CFOSAT (on board altimeter not from the SWIM instrument); h2b: Hai Yang 2B.