Accuracy assessment of generated hi-res DEMs using tri-stereo satellite images from KOMPSAT & SkySat
Accuracy assessment of generated high-resolution DEMs using tri-stereo satellite images from KOMPSAT and SkySat over Davao City
Pocholo Miguel De Lara
Science Research Specialist I
Solutions and Services Engineering Division
DOST-ASTI
Digital elevation models, or DEMs, are digital representation of the Earth’s surface elevation, and have a variety of applications, such as environmental impact assessment and disaster management. This paper discusses extraction of highresolution DEMs from tri-stereo satellite imagery, and accuracy assessment of these DEMs after comparison with publicly available dataset containing elevation information. Tri-stereo images from KOMPSAT are of Level 1O, also known as ortho-ready. Pansharpening of multispectral image, with approximately 2.8-meter resolution, and panchromatic image, with approximately 0.7-meter resolution, was done to obtain a multispectral image with the resolution of the panchromatic image. Tri-stereo images from SkySat were already pansharpened and has approximately 0.5-meter resolution. ESRI World Imagery of Davao City was used as reference image for GCP collection. Epipolar images of the pansharpened KOMPSAT and SkySat images were used to generate 0.7 m resolution and 0.85 m resolution DEMs of Davao City, respectively. To assess the accuracy of the generated DEMs, these were compared with the spot elevation from NAMRIA, with a scale of 1:50,000, and 30 m resolution SRTM DEM. Generated DEM from KOMPSAT has mean error and RMSE of 2.78 and 4.58, respectively, from the spot elevation, and 4.40 and 6.27, respectively, from the SRTM DEM. As for the generated DEM from SkySat, the mean error and RMSE are 3.23 and 5.57, respectively, from the spot elevation, and 3.94 and 6.04, respectively, from the SRTM DEM. The KOMPSAT-generated DEM has lower error after comparison with the spot elevation, while the SkySat-generated DEM has lower error after comparison with the SRTM DEM.
As part of the National Electrical, Electronics and Computer Engineering Conference (NEECECON 2024), this technical session is organized by the UP Electrical and Electronics Engineering Institute with the theme "National Development through Sustainable Industrialization."
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