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29 January 2024 Accuracy assessment of generated high-resolution DEMs using tri-stereo satellite images from KOMPSAT and SkySat over Davao City
Korinne Ella R. Morico, Harold Bryan S. Paler, Alvin E. Retamar
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Proceedings Volume 12977, Eighth Geoinformation Science Symposium 2023: Geoinformation Science for Sustainable Planet; 129771D (2024) https://doi.org/10.1117/12.3009684
Event: 8th Geoinformation Science Symposium 2023: Geoinformation Science for Sustainable Planet, 2023, Yogyakarta, Indonesia
Abstract
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.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Korinne Ella R. Morico, Harold Bryan S. Paler, and Alvin E. Retamar "Accuracy assessment of generated high-resolution DEMs using tri-stereo satellite images from KOMPSAT and SkySat over Davao City", Proc. SPIE 12977, Eighth Geoinformation Science Symposium 2023: Geoinformation Science for Sustainable Planet, 129771D (29 January 2024); https://doi.org/10.1117/12.3009684
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KEYWORDS
Satellites
Earth observing sensors
Satellite imaging
Image resolution
Accuracy assessment
Image processing
Correlation coefficients
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