Satellite radar altimetry from open ocean to coasts: challenges and perspectives

2006 ◽  
Author(s):  
Stefano Vignudelli ◽  
Helen M. Snaith ◽  
Florent Lyard ◽  
Paolo Cipollini ◽  
Fabio Venuti ◽  
...  
Keyword(s):  
Open Ocean ◽  
Radar Altimetry ◽  
Satellite Radar ◽  
Satellite Radar Altimetry

Monitoring Topography of Coastal Lagoons Using Satellite Radar Altimetry

2018 ◽  
Author(s):  
Edward Salameh ◽  
Frederic Frappart ◽  
Vincent Marieu ◽  
Alexandra Spodar ◽  
Jean-Paul Parisot ◽  
...  
Keyword(s):  
Coastal Lagoons ◽  
Radar Altimetry ◽  
Satellite Radar ◽  
Satellite Radar Altimetry

scholarly journals Evaluation of historic and operational satellite radar altimetry missions for constructing consistent long-term lake water level records

2021 ◽  
Vol 25 (3) ◽  
pp. 1643-1670
Author(s):  
Song Shu ◽  
Hongxing Liu ◽  
Richard A. Beck ◽  
Frédéric Frappart ◽  
Johanna Korhonen ◽  
...  
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Small Lakes ◽  
Radar Altimetry ◽  
Lake Water Level ◽  
Systematic Biases ◽  
Data Missing ◽  
Satellite Radar ◽  
Satellite Radar Altimetry

Abstract. A total of 13 satellite missions have been launched since 1985, with different types of radar altimeters on board. This study intends to make a comprehensive evaluation of historic and currently operational satellite radar altimetry missions for lake water level retrieval over the same set of lakes and to develop a strategy for constructing consistent long-term water level records for inland lakes at global scale. The lake water level estimates produced by different retracking algorithms (retrackers) of the satellite missions were compared with the gauge measurements over 12 lakes in four countries. The performance of each retracker was assessed in terms of the data missing rate, the correlation coefficient r, the bias, and the root mean square error (RMSE) between the altimetry-derived lake water level estimates and the concurrent gauge measurements. The results show that the model-free retrackers (e.g., OCOG/Ice-1/Ice) outperform the model-based retrackers for most of the missions, particularly over small lakes. Among the satellite altimetry missions, Sentinel-3 gave the best results, followed by SARAL. ENVISAT has slightly better lake water level estimates than Jason-1 and Jason-2, but its data missing rate is higher. For small lakes, ERS-1 and ERS-2 missions provided more accurate lake water level estimates than the TOPEX/Poseidon mission. In contrast, for large lakes, TOPEX/Poseidon is a better option due to its lower data missing rate and shorter repeat cycle. GeoSat and GeoSat Follow-On (GFO) both have an extremely high data missing rate of lake water level estimates. Although several contemporary radar altimetry missions provide more accurate lake level estimates than GFO, GeoSat was the sole radar altimetry mission, between 1985 and 1990, that provided the lake water level estimates. With a full consideration of the performance and the operational duration, the best strategy for constructing long-term lake water level records should be a two-step bias correction and normalization procedure. In the first step, use Jason-2 as the initial reference to estimate the systematic biases with TOPEX/Poseidon, Jason-1, and Jason-3 and then normalize them to form a consistent TOPEX/Poseidon–Jason series. Then, use the TOPEX/Poseidon–Jason series as the reference to estimate and remove systematic biases with other radar altimetry missions to construct consistent long-term lake water level series for ungauged lakes.

Indus river water level monitoring using satellite radar altimetry

2020 ◽  
Author(s):  
Arjumand Z. Zaidi ◽  
Stefano Vignudelli ◽  
Zarif Khero ◽  
Badar M.K. Ghauri ◽  
Ramsha Muzaffer ◽  
...  
Keyword(s):  
Water Level ◽  
River Water ◽  
Indus River ◽  
Radar Altimetry ◽  
Satellite Radar ◽  
Satellite Radar Altimetry ◽  
Level Monitoring ◽  
Water Level Monitoring

scholarly journals Monitoring Sea Level and Topography of Coastal Lagoons Using Satellite Radar Altimetry: The Example of the Arcachon Bay in the Bay of Biscay

2018 ◽  
Vol 10 (2) ◽  
pp. 297 ◽  
Author(s):  
Edward Salameh ◽  
Frédéric Frappart ◽  
Vincent Marieu ◽  
Alexandra Spodar ◽  
Jean-Paul Parisot ◽  
...  
Keyword(s):  
Sea Level ◽  
Coastal Lagoons ◽  
Bay Of Biscay ◽  
Radar Altimetry ◽  
Arcachon Bay ◽  
Satellite Radar ◽  
Satellite Radar Altimetry
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