TY - JOUR
T1 - On the performance of Sentinel-3 altimetry over new reservoirs
T2 - Approaches to determine onboard a priori elevation
AU - Zhang, Xingxing
AU - Jiang, Liguang
AU - Kittel, Cécile M.M.
AU - Yao, Zhijun
AU - Nielsen, Karina
AU - Liu, Zhaofei
AU - Wang, Rui
AU - Liu, Jun
AU - Andersen, Ole B.
AU - Bauer-Gottwein, Peter
N1 - Funding Information:
This work is jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA20060202), the Innovation Fund Denmark (Innovationsfonden) (File: 8087‐00002B), and the Danida Fellowship Centre (File: 18‐M01‐DTU) Xingxing Zhang is financially supported by the Chinese Scholarship Council, which is greatly acknowledged. We would like to thank Denis Blumstein for providing material on OLTC. Thanks also go to Editor Mathieu Morlighem and two anonymous reviewers whose comments helped improve the manuscript.
Funding Information:
This work is jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA20060202), the Innovation Fund Denmark (Innovationsfonden) (File: 8087-00002B), and the Danida Fellowship Centre (File: 18-M01-DTU) Xingxing Zhang is financially supported by the Chinese Scholarship Council, which is greatly acknowledged. We would like to thank Denis Blumstein for providing material on OLTC. Thanks also go to Editor Mathieu Morlighem and two anonymous reviewers whose comments helped improve the manuscript.
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.
PY - 2020/9/16
Y1 - 2020/9/16
N2 - Satellite radar altimetry has become an important data source supplementing in situ water level. For practical reasons, a radar altimeter can only record reflected echoes within its range window. Therefore, water surface elevation must fall within the range window. To this end, the Sentinel-3 radar altimetry mission is configured with a new tracking function (i.e., open loop) to position its range window based on an onboard a priori elevation of ground targets. We found that Sentinel-3 is unable to observe recently built reservoirs due to the incorrect onboard elevations. To overcome this issue, four approaches are proposed to improve the a priori elevation for inland water bodies, particularly reservoirs. These approaches can significantly increase data availability of Sentinel-3 over reservoirs and can be used to prepare the onboard elevations of reservoirs and lakes for future missions such as Sentinel-6, Sentinel-3C/-3D, and the Surface Water and Ocean Topography (SWOT) mission.
AB - Satellite radar altimetry has become an important data source supplementing in situ water level. For practical reasons, a radar altimeter can only record reflected echoes within its range window. Therefore, water surface elevation must fall within the range window. To this end, the Sentinel-3 radar altimetry mission is configured with a new tracking function (i.e., open loop) to position its range window based on an onboard a priori elevation of ground targets. We found that Sentinel-3 is unable to observe recently built reservoirs due to the incorrect onboard elevations. To overcome this issue, four approaches are proposed to improve the a priori elevation for inland water bodies, particularly reservoirs. These approaches can significantly increase data availability of Sentinel-3 over reservoirs and can be used to prepare the onboard elevations of reservoirs and lakes for future missions such as Sentinel-6, Sentinel-3C/-3D, and the Surface Water and Ocean Topography (SWOT) mission.
KW - data acquisition
KW - inland water
KW - open-loop tracking
KW - radar altimetry
KW - reservoir
KW - water surface elevation
UR - https://www.scopus.com/pages/publications/85090867490
U2 - 10.1029/2020GL088770
DO - 10.1029/2020GL088770
M3 - Article
AN - SCOPUS:85090867490
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 17
M1 - e2020GL088770
ER -