This study evaluates the performance of the SYM12 digital surface model, derived from radar interferometry between 2011 and 2014, by comparing it with two reference datasets: the ICESat-2 ATL03 lidar altimeter (2018–2023) and 879 GPS ground control points measured in 2024. Relationships between SYM12, ICESat-2 ATL03, and GPS measurements were tested using root mean square error (RMSE), mean absolute error (MAE), and Pearson correlation coefficient analysis. Both unfiltered and interquartile range (IQR) filtered data were analyzed. Results indicate a strong correlation (R > 0.99) between SYM12, ICESat-2 ATL03, and GPS observations in low- and mid-elevation regions, while discrepancies increase in high-elevation and complex terrain areas. Filtering improved the performance of SYM12 relative to ATL03, reducing the RMSE from 35.54 m to 2.24 m and the MAE from 5.10 m to 1.60 m. Notably, RMSE and MAE values remained higher in high-altitude areas. For SYM12-GPS comparisons, the RMSE and MAE were 2.32 m and 1.56 m, respectively, while GPS-ATL03 comparisons yielded RMSE and MAE values of 0.60 m and 0.39 m, respectively. This study underscores the value of integrating newer lidar-based datasets, such as ATL03, to enhance the accuracy of DSMs derived from radar interferometry.
Digital Surface Model (DSM12) ICESat-2 ATL03 radar interferometry lidar altimetry
I would like to express my gratitude to the General Directorate of Mapping (HGM) for providing the SYM12 and TG20 datasets, and to the National Snow and Ice Data Center (NSIDC) for access to the ICESat-2 ATL03 data.
Birincil Dil | İngilizce |
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Konular | Fotogrametri ve Uzaktan Algılama |
Bölüm | Araştırma Makaleleri |
Yazarlar | |
Yayımlanma Tarihi | 30 Haziran 2025 |
Gönderilme Tarihi | 25 Mart 2025 |
Kabul Tarihi | 24 Nisan 2025 |
Yayımlandığı Sayı | Yıl 2025 Cilt: 7 Sayı: 1 |