Lateral image degradation in terrestrial laser scanning
Files in This Item:
|open repository version.pdf||623.16 kB||Adobe PDF||Download|
|Title:||Lateral image degradation in terrestrial laser scanning||Authors:||Laefer, Debra F.
Maloney, Eoghan M.
|Permanent link:||http://hdl.handle.net/10197/3408||Date:||May-2009||Abstract:||The use of aerial laser scanning to detect change in infrastructure and buildings after major disasters has become increasingly common in recent years to help prioritize interventions. More recent efforts are being invested to apply laser scanning in the assessment and structural health monitoring of buildings to simplify and quicken building damage surveys by the automatic detection of defects and deformations. Technology application must, however, be done in cognizance of equipment constraints regarding scan angle, sampling size, and beam width. This article reports a series of laboratory and field experiments designed to begin to quantify and minimise the possible errors for effective defect detection via terrestrial laser scanning during surveying. Varying geometric positions that cause either over- or under-prediction of crack thickness and length as a function of both standoff distance and angle of obliquity between the scanner and the defect are presented. These may over-predict horizontal crack thickness by 15 mm and failing to detect others. To help minimise such errors, a standoff distance of 12–15 m with a maximum obliquity of 45˚ between the scanner and target object are recommended.||Funding Details:||Science Foundation Ireland||Type of material:||Journal Article||Publisher:||International Association of Bridge and Structural Engineers||Copyright (published version):||2009 IABSE||Keywords:||Crack detection;Defects;Digital techniques;Terrestrial laser scan;Light Detection and Ranging (LiDAR);Site evaluation;Structural health monitoring;Imaging techniques;Field investigations||Subject LCSH:||Structural stability--Data processing
Image processing--Digital techniques
|DOI:||10.2749/101686609788220196||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Critical Infrastructure Group Research Collection|
Civil Engineering Research Collection
Show full item record
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.