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A Comparative Study of Photogrammetric Methods using Panoramic Photography in a Forensic Context

SHEPPARD, Kayleigh and CASSELLA, John and FIELDHOUSE, Sarah (2017) A Comparative Study of Photogrammetric Methods using Panoramic Photography in a Forensic Context. Forensic Science International. ISSN 1872-6283

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Abstract or description

Abstract
Taking measurements of a scene is an integral aspect of the crime scene documentation
process, and accepted limits of accuracy for taking measurements at a crime scene vary
throughout the world. In the UK, there is no published accepted limit of accuracy, whereas the
United States has an accepted limit of accuracy of 0.25 inch. As part of the International
organisation for Standardisation 17020 accreditation competency testing is required for all
work conducted at the crime scene. As part of this, all measuring devices need to be
calibrated within known tolerances in order to meet the required standard, and measurements
will be required to have a clearly defined limit of accuracy. This investigation sought to
compare measurement capabilities of two different methods for measuring crime scenes;
using a tape measure, and a 360o camera with complimentary photogrammetry software
application. Participants measured ten fixed and non-fixed items using both methods and
these were compared to control measurements taken using a laser distance measure.
Statistical analysis using a Wilcoxon Signed Rank test demonstrated statistically significant
differences between the tape, software and control measurements. The majority of the
differences were negligible, amounting to millimetre differences. The tape measure was found
to be more accurate than the software application, which offered greater precision.
Measurement errors were attributed to human error in understanding the operation of the
software, suggesting that training be given before using the software to take measurements.
Transcription errors were present with the tape measure approach. Measurements taken
using the photogrammetry software were more reproducible than the tape measure approach,
and offered flexibility with regards to the time and location of the documentation process,
unlike manual tape measuring.

Item Type: Article
Faculty: School of Law, Policing and Forensics > Criminal Justice and Forensic Science
Depositing User: John CASSELLA
Date Deposited: 14 Feb 2017 10:03
Last Modified: 14 Feb 2017 10:03
URI: http://eprints.staffs.ac.uk/id/eprint/3016

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