Lateral image degradation in terrestrial laser scanning

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Title: Lateral image degradation in terrestrial laser scanning
Authors: Laefer, Debra F.
Fitzgerald, M.
Maloney, Eoghan M.
Coyne, David
Lennon, Donal
Morrish, Sean
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
Buildings--Defects
Optical scanners
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

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