Vertical Accuracy Assessment of Digital Elevation Models Generated by Sentinel 1A: A Case study: Eldabha, EGYPT

Besheer, Mohamed Ahmed; Mohamed, Doaa Ahmed; Sonbaty, Ahmed Ahmed; Farrag, Farrag Ali

doi:10.21608/jesaun.2025.372829.1470

Vertical Accuracy Assessment of Digital Elevation Models Generated by Sentinel 1A: A Case study: Eldabha, EGYPT

Document Type : Case Study

Authors

¹ Civil engineering department , faculty of engineering, Assuit university, Assuit, Egypt

² Director of the spatial state administration, New Valley Governor, Egypt.

³ Civil Engineering department, faculty of engineering, Assuit university, Egypt

⁴ Prof. of surveying and photogrammetry, Civil Eng. Dpt. Faculty of Engineering, Assiut University.

10.21608/jesaun.2025.372829.1470

Abstract

This research focuses on improving the vertical accuracy of Digital Elevation Models (DEMs) generated from Sentinel-1A satellite imagery. The study investigates the influence of Goldstein filtering, temporal baseline, and perpendicular baseline on DEM accuracy. Two DEMs were created for the Eldabha region using distinct baseline configurations: (a) a 24-day temporal baseline with a 160 m perpendicular baseline, and (b) a 12-day temporal baseline with a 230 m perpendicular baseline. Each DEM was generated both with and without the application of the Goldstein filter. Accuracy assessments were conducted using GNSS data, with evaluation metrics including Root Mean Square Error (RMSE), standard deviation (STD), mean error, and the range of elevation differences. The results indicate that model (b), which utilized the shorter temporal and larger perpendicular baselines along with Goldstein filtering, achieved the highest accuracy, yielding an RMSE of 12.00 meters. The findings underscore the importance of selecting suitable interferometric baselines and applying effective filtering techniques to enhance DEM quality.

Keywords

Main Subjects

Civil Engineering: structural, Geotechnical, reinforced concrete and steel structures, Surveying, Road and traffic engineering, water resources, Irrigation structures, Environmental and sanitary engineering, Hydraulic, Railway, construction Management.

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