A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Ortho-photogrammetry for prefabricated energy-efficiency retrofits
Abstract Panel-based prefabricated retrofits of existing building envelopes are considered a promising strategy for improving energy performance and reducing greenhouse gas emissions. These projects typically require some form of 3D model of the as-is building geometry, in order to construct the panels offsite, and, currently they tend to use laser scanning for this purpose, because of their accuracy requirements. However, laser scanners must be operated from a tripod, and producing drawings from scans is a largely manual process involving unwieldy amounts of data. We propose a line-photogrammetric approach that requires a small number of photographs (typically 8), that we call ‘Ortho-Photogrammetry’. Ortho-Photogrammetry is parametrised by axis-aligned planes and produces rectified geometry suitable for panel construction. It does not require a calibrated camera or targets. We demonstrate that it is sufficiently accurate to support prefabricated retrofits, even when used with photos from a consumer UAV.
Highlights Requires a small number of photographs for a reconstruction. Uses image lines parametrized by plane intersections. Geometry is rectified and simple to use for panel design. No initialization or camera calibration required. Accuracy of ±3.25 mm from UAV photographs.
Ortho-photogrammetry for prefabricated energy-efficiency retrofits
Abstract Panel-based prefabricated retrofits of existing building envelopes are considered a promising strategy for improving energy performance and reducing greenhouse gas emissions. These projects typically require some form of 3D model of the as-is building geometry, in order to construct the panels offsite, and, currently they tend to use laser scanning for this purpose, because of their accuracy requirements. However, laser scanners must be operated from a tripod, and producing drawings from scans is a largely manual process involving unwieldy amounts of data. We propose a line-photogrammetric approach that requires a small number of photographs (typically 8), that we call ‘Ortho-Photogrammetry’. Ortho-Photogrammetry is parametrised by axis-aligned planes and produces rectified geometry suitable for panel construction. It does not require a calibrated camera or targets. We demonstrate that it is sufficiently accurate to support prefabricated retrofits, even when used with photos from a consumer UAV.
Highlights Requires a small number of photographs for a reconstruction. Uses image lines parametrized by plane intersections. Geometry is rectified and simple to use for panel design. No initialization or camera calibration required. Accuracy of ±3.25 mm from UAV photographs.
Ortho-photogrammetry for prefabricated energy-efficiency retrofits
Gilmour, Logan (author) / Stroulia, Eleni (author)
2021-11-27
Article (Journal)
Electronic Resource
English
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