Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

Liguang Jiang*, Ole Baltazar Andersen, Karina Nielsen, Guoqing Zhang, Peter Bauer-Gottwein

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed. This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3). Results indicate that the geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of WSE estimates. These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeter-level accuracy, which can be used to improve global and regional geopotential models.
Original languageEnglish
JournalRemote Sensing of Environment
Volume221
Pages (from-to)65-79
ISSN0034-4257
DOIs
Publication statusPublished - 2019

Keywords

  • CryoSat-2
  • Lake Namco
  • Local geoid
  • Satellite altimetry
  • Water level
  • Aneroid altimeters

Cite this

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title = "Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco",
abstract = "Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed. This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3). Results indicate that the geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of WSE estimates. These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeter-level accuracy, which can be used to improve global and regional geopotential models.",
keywords = "CryoSat-2, Lake Namco, Local geoid, Satellite altimetry, Water level, Aneroid altimeters",
author = "Liguang Jiang and Andersen, {Ole Baltazar} and Karina Nielsen and Guoqing Zhang and Peter Bauer-Gottwein",
year = "2019",
doi = "10.1016/j.rse.2018.11.004",
language = "English",
volume = "221",
pages = "65--79",
journal = "Remote Sensing of Environment",
issn = "0034-4257",
publisher = "Elsevier",

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TY - JOUR

T1 - Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

AU - Jiang, Liguang

AU - Andersen, Ole Baltazar

AU - Nielsen, Karina

AU - Zhang, Guoqing

AU - Bauer-Gottwein, Peter

PY - 2019

Y1 - 2019

N2 - Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed. This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3). Results indicate that the geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of WSE estimates. These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeter-level accuracy, which can be used to improve global and regional geopotential models.

AB - Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed. This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3). Results indicate that the geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of WSE estimates. These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeter-level accuracy, which can be used to improve global and regional geopotential models.

KW - CryoSat-2

KW - Lake Namco

KW - Local geoid

KW - Satellite altimetry

KW - Water level

KW - Aneroid altimeters

U2 - 10.1016/j.rse.2018.11.004

DO - 10.1016/j.rse.2018.11.004

M3 - Journal article

VL - 221

SP - 65

EP - 79

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

ER -