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Near real-time altimetry for river monitoring—a global assessment of Sentinel-3

Jiang, Liguang, Zhao, Yanan, Nielsen, Karina, Andersen, Ole B, Bauer-Gottwein, Peter·2023·Environmental Research Letters
DOI 10.1088/1748-9326/acdd16
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Abstract

For applications such as weather, flood, and drought forecasting that need water level estimates as soon as possible, near real-time (NRT) products are most appropriate. Unlike in-situ sensors for water level measurements, which typically deliver NRT data, satellite altimeters deliver physically meaningful observations with substantial delays after acquisition. The new radar altimetry mission, Sentinel-3, is capable of delivering NRT water levels within a few hours of observation. Currently, it remains unexplored how accurate the NRT product is in the context of river monitoring. This study assesses Sentinel-3A/B NRT products in mapping river water level variations globally. Based on a three-year comparison, we find that the water level derived from NRT is almost as good as that from the delayed products (median root-mean-square error (RMSE): 21.5 cm and 23.5 for S3A and S3B), and both products achieve very similar RMSE values (median: 52.5 cm and 59.0 cm for NRT and non-time critical) against in-situ data at 25 locations. This study highlights the usefulness of Sentinel-3 NRT product for river monitoring and forecasting. And we recommend the NRT product if latency is a primary concern.

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Metadata

Authors
Jiang, L., Zhao, Y., Nielsen, K., Andersen, O. B., & Bauer-Gottwein, P.
ORCID
Jiang, Liguang
Venue
Environmental Research Letters
Publisher
IOP Publishing
Published
2023-06-20
Volume
18
Issue
7
Pages
074017
ISSN
1748-9326
DOI
10.1088/1748-9326/acdd16
Cited by
14
References
1
Licence
Funders
  • Danida Fellowship Centre (18‐M01‐DTU)
  • CRSRI Open Research Program (CKWV20221009/KY)
  • SUSTech research startup grant (Y01296129)

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CoChat. (2026). Citation check: Near real-time altimetry for river monitoring—a global assessment of Sentinel-3. https://app.cochat.ai/papers/10.1088/1748-9326/acdd16
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Jiang, L., Zhao, Y., Nielsen, K., Andersen, O. B., & Bauer-Gottwein, P. (2023). Near real-time altimetry for river monitoring—a global assessment of Sentinel-3. Environmental Research Letters. https://doi.org/10.1088/1748-9326/acdd16

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