Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR)
Digital Elevation Model (DEM) is a digital representation of ground surface topography or terrain. There are many freely available DEM data with a spatial resolution of 30 m to 90 m. Nevertheless, their vertical accuracy may vary, depending on the vegetation cover and terrain characteristics. This s...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English English |
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IOP Publishing
2021
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| Online Access: | https://eprints.ums.edu.my/id/eprint/34053/1/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%20.pdf https://eprints.ums.edu.my/id/eprint/34053/2/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%201.pdf |
| _version_ | 1825714986779934720 |
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| author | L T Chai C J Wong D James H Y Loh J J F Liew W V C Wong Phua, Mui How |
| author_facet | L T Chai C J Wong D James H Y Loh J J F Liew W V C Wong Phua, Mui How |
| author_sort | L T Chai |
| collection | UMS |
| description | Digital Elevation Model (DEM) is a digital representation of ground surface topography or terrain. There are many freely available DEM data with a spatial resolution of 30 m to 90 m. Nevertheless, their vertical accuracy may vary, depending on the vegetation cover and terrain characteristics. This study examined the vertical accuracy of open-access global DEMs (ALOS PALSAR, ASTER GDEM3, SRTM, TanDEM-X) and fused DEM (EarthEnvDEM90, MERIT DEM). Their performances were assessed using a Digital Terrain Model (DTM) generated using airborne LiDAR data that had an outstanding absolute vertical accuracy (mean error (ME) = 0.24 m; root mean square error (RMSEz) = 1.20 m). Height differences between the global DEMs and the LiDAR DTM were calculated and examined their performances by forested vs. non-forested, slope, and elevation classes. The results showed the MERIT DEM was superior to other DEMs in most of the testing methods. It outperformed other DEMs with an RMSEz value of 3.02 m in the forested areas, followed by ALOS PALSAR (9.29 m), EarthEnv-DEM90 (9.40 m), SRTM (9.80 m), TanDEM-X (10.41 m), and ASTER GDEM3 (12.57 m). The MERIT DEM also had the best accuracy in the higher elevation areas. Overall, the ASTER GDEM3 had the worst accuracies, with relatively large over-estimations compared to other DEMs. Despite its low spatial resolution, the MERIT DEM was the best for representing terrain elevation for applications over a large area. |
| first_indexed | 2024-03-06T03:19:56Z |
| format | Article |
| id | ums.eprints-34053 |
| institution | Universiti Malaysia Sabah |
| language | English English |
| last_indexed | 2024-03-06T03:19:56Z |
| publishDate | 2021 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | ums.eprints-340532022-08-30T02:17:38Z https://eprints.ums.edu.my/id/eprint/34053/ Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) L T Chai C J Wong D James H Y Loh J J F Liew W V C Wong Phua, Mui How QE1-350.62 General Including geographical divisions QH1-(199.5) General Including nature conservation, geographical distribution Digital Elevation Model (DEM) is a digital representation of ground surface topography or terrain. There are many freely available DEM data with a spatial resolution of 30 m to 90 m. Nevertheless, their vertical accuracy may vary, depending on the vegetation cover and terrain characteristics. This study examined the vertical accuracy of open-access global DEMs (ALOS PALSAR, ASTER GDEM3, SRTM, TanDEM-X) and fused DEM (EarthEnvDEM90, MERIT DEM). Their performances were assessed using a Digital Terrain Model (DTM) generated using airborne LiDAR data that had an outstanding absolute vertical accuracy (mean error (ME) = 0.24 m; root mean square error (RMSEz) = 1.20 m). Height differences between the global DEMs and the LiDAR DTM were calculated and examined their performances by forested vs. non-forested, slope, and elevation classes. The results showed the MERIT DEM was superior to other DEMs in most of the testing methods. It outperformed other DEMs with an RMSEz value of 3.02 m in the forested areas, followed by ALOS PALSAR (9.29 m), EarthEnv-DEM90 (9.40 m), SRTM (9.80 m), TanDEM-X (10.41 m), and ASTER GDEM3 (12.57 m). The MERIT DEM also had the best accuracy in the higher elevation areas. Overall, the ASTER GDEM3 had the worst accuracies, with relatively large over-estimations compared to other DEMs. Despite its low spatial resolution, the MERIT DEM was the best for representing terrain elevation for applications over a large area. IOP Publishing 2021 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/34053/1/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%20.pdf text en https://eprints.ums.edu.my/id/eprint/34053/2/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%201.pdf L T Chai and C J Wong and D James and H Y Loh and J J F Liew and W V C Wong and Phua, Mui How (2021) Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR). IOP Conference Series: Earth and Environmental Science, 1053. pp. 1-6. ISSN 1755-1315 https://iopscience.iop.org/article/10.1088/1755-1315/1053/1/012025/pdf https://doi.org/10.1088/1755-1315/1053/1/012025 https://doi.org/10.1088/1755-1315/1053/1/012025 |
| spellingShingle | QE1-350.62 General Including geographical divisions QH1-(199.5) General Including nature conservation, geographical distribution L T Chai C J Wong D James H Y Loh J J F Liew W V C Wong Phua, Mui How Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title | Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title_full | Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title_fullStr | Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title_full_unstemmed | Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title_short | Vertical accuracy comparison of multi-source Digital Elevation Model (DEM) with Airborne Light Detection and Ranging (LiDAR) |
| title_sort | vertical accuracy comparison of multi source digital elevation model dem with airborne light detection and ranging lidar |
| topic | QE1-350.62 General Including geographical divisions QH1-(199.5) General Including nature conservation, geographical distribution |
| url | https://eprints.ums.edu.my/id/eprint/34053/1/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%20.pdf https://eprints.ums.edu.my/id/eprint/34053/2/Vertical%20accuracy%20comparison%20of%20multi-source%20Digital%20Elevation%20Model%20%28DEM%29%20with%20Airborne%20Light%20Detection%20and%20Ranging%20%28LiDAR%29%201.pdf |
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