Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas
WorldView-3 satellite is providing images with an unprecedented combination of high spatial and spectral resolution. The stereo capabilities and the very high resolution of the panchromatic band (0.31 m) have been fostering new applications in urban areas, where the complexity of the morphology requ...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-04-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/11/7/878 |
| _version_ | 1798018421395292160 |
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| author | Emanuele Mandanici Valentina A. Girelli Luca Poluzzi |
| author_facet | Emanuele Mandanici Valentina A. Girelli Luca Poluzzi |
| author_sort | Emanuele Mandanici |
| collection | DOAJ |
| description | WorldView-3 satellite is providing images with an unprecedented combination of high spatial and spectral resolution. The stereo capabilities and the very high resolution of the panchromatic band (0.31 m) have been fostering new applications in urban areas, where the complexity of the morphology requires a higher level of detail. The present technical note aims to test the accuracy of digital elevation models that can be obtained by WorldView-3 stereo-pairs in these particular contexts, with an operational state-of-the-art algorithm. Validation is performed using check points and existing models of the area (from LiDAR data and oblique aerial images). The experiments, conducted over the city of Bologna (Italy) with six images, proved that roof surfaces and open spaces can be reconstructed with an average error of 1–2 pixels, but severe discrepancies frequently occur in narrow roads and urban canyons (up to several metres in average). The level of completeness achievable with only one pair is extremely variable (ranging from 50% to 90%), due to the combined effect of the geometry of acquisition and the specific urban texture. Better results can be obtained by using more than one pair. Furthermore, smaller convergence angles can be beneficial for the reconstruction of specific urban structures, such as soaring towers. |
| first_indexed | 2024-04-11T16:23:54Z |
| format | Article |
| id | doaj.art-e15004ccb11e4a1cb85498a4500f5f92 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-04-11T16:23:54Z |
| publishDate | 2019-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-e15004ccb11e4a1cb85498a4500f5f922022-12-22T04:14:14ZengMDPI AGRemote Sensing2072-42922019-04-0111787810.3390/rs11070878rs11070878Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban AreasEmanuele Mandanici0Valentina A. Girelli1Luca Poluzzi2Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, 40136 Bologna, ItalyDepartment of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, 40136 Bologna, ItalyDepartment of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, 40136 Bologna, ItalyWorldView-3 satellite is providing images with an unprecedented combination of high spatial and spectral resolution. The stereo capabilities and the very high resolution of the panchromatic band (0.31 m) have been fostering new applications in urban areas, where the complexity of the morphology requires a higher level of detail. The present technical note aims to test the accuracy of digital elevation models that can be obtained by WorldView-3 stereo-pairs in these particular contexts, with an operational state-of-the-art algorithm. Validation is performed using check points and existing models of the area (from LiDAR data and oblique aerial images). The experiments, conducted over the city of Bologna (Italy) with six images, proved that roof surfaces and open spaces can be reconstructed with an average error of 1–2 pixels, but severe discrepancies frequently occur in narrow roads and urban canyons (up to several metres in average). The level of completeness achievable with only one pair is extremely variable (ranging from 50% to 90%), due to the combined effect of the geometry of acquisition and the specific urban texture. Better results can be obtained by using more than one pair. Furthermore, smaller convergence angles can be beneficial for the reconstruction of specific urban structures, such as soaring towers.https://www.mdpi.com/2072-4292/11/7/878WorldView-3urban modellingDEM accuracyDEM validationsemi-global matching |
| spellingShingle | Emanuele Mandanici Valentina A. Girelli Luca Poluzzi Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas Remote Sensing WorldView-3 urban modelling DEM accuracy DEM validation semi-global matching |
| title | Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas |
| title_full | Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas |
| title_fullStr | Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas |
| title_full_unstemmed | Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas |
| title_short | Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas |
| title_sort | metric accuracy of digital elevation models from worldview 3 stereo pairs in urban areas |
| topic | WorldView-3 urban modelling DEM accuracy DEM validation semi-global matching |
| url | https://www.mdpi.com/2072-4292/11/7/878 |
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