Lenton, Paul (2011) Use of near-infrared photogrammetry to determine crack and surface deformation in small structures. [USQ Project]
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Abstract
The purpose of this Research Project was to compare conventional (colour)photogrammetry with near-infrared photogrammetry to determine whether the use of near-infrared photogrammetry is a suitable method for measuring structural deformation. To undertake this, laboratory testing was conducted by Mr. Daniel Pratt (as part of his undergraduate thesis) under controlled circumstances on a
number of structural materials to gauge whether there was a significant difference between the two methods of photogrammetry. Anecdotal evidence provided by Mr. Pratt suggested there were no significant differences in method and that nearinfrared photogrammetry was a suitable method.
This Research Project then examined the two photogrammetric methods on the Hodgson Creek bridge, located at Eton Vale, approximately 16km southwest of Toowoomba on the New England Highway. Both diffuse and retro-reflective targets were used for this project, with the targets placed upon Pier 4 of this structure. A control traverse, using conventional total station equipment was used to place control station under the structure and locate targets on the pier headstock to within ±0.002m. Image capture was conducted at night with the resulting stereo images imported into the Australis v6.0 photogrammetric software package for processing.
The Australis bundle adjustment results agreed with the findings of the laboratory studies, and suggest at face value that there is no significant difference between
the two methods, and suggests that near-infrared methods are indeed suitable for conducting deformation studies. However a number of issues occurred in the field that have the potential to influence the results of photogrammetric work undertaken on built structures. It is recommended that further investigation,combined with a tightening of error sources, should be undertaken to ensure best possible conditions for field photogrammetric studies, and allow for accurate comparisons be made between photogrammetric methods.
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| Item Type: | USQ Project |
|---|---|
| Refereed: | No |
| Item Status: | Live Archive |
| Faculty/School / Institute/Centre: | Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information (Up to 30 Jun 2013) |
| Supervisors: | Chong, Albert |
| Date Deposited: | 20 Dec 2012 06:46 |
| Last Modified: | 03 Jul 2013 01:36 |
| Uncontrolled Keywords: | photogrammetry, near-infrared photogrammetry, structural deformation |
| Fields of Research (2008): | 09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing |
| Fields of Research (2020): | 40 ENGINEERING > 4013 Geomatic engineering > 401304 Photogrammetry and remote sensing |
| URI: | https://sear.unisq.edu.au/id/eprint/22550 |
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