Refinement of ICESat-2 derived inland water surface levels with the TG20 local geoid model: In the case of Türkiye lakes

Kaya Y., BALIK ŞANLI F., ABDİKAN S.

Physics and Chemistry of the Earth, cilt.139, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 139
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.pce.2025.103900
  • Dergi Adı: Physics and Chemistry of the Earth
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, Chimica, Communication Abstracts, Compendex, Geobase, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Anahtar Kelimeler: ICESat-2, Inland water, Lidar altimetry, Türkiye geoid (TG20), Water surface level
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

This study examined the contribution of the Türkiye Geoid 2020 (TG20) local gravitational model to water height estimation using ICESat-2 ATL13 data. We tested eight separate lakes in Türkiye to achieve this aim. The EGM2008 values were determined by a comparison of the orthometric heights derived from ATL13 data and the ellipsoidal heights derived from ATL03 data. Subsequently, the corresponding latitude and longitude values within the local gravitational model were obtained and integrated into the ICESat-2 data. The root mean square error (RMSE) for the unfiltered and filtered ATL13EGM2008 data was 0.66 m and 0.53 m, respectively. The filtering method in the ATL13TG20 data resulted in an average improvement of the RMSE from 0.62 m to 0.27 m. The local gravity model refinement tested in 8 different lakes showed an RMSE improvement ranging from 17% to 71%. This study demonstrates that local gravity models significantly improve the vertical accuracy of ICESat-2.