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Scientific paper - Preliminary note / Short communication
Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example
Policija i sigurnost, 31 (2022), 1/2022; 29-38. urn:nbn:hr:227:529113
Kasum, Josip; Jerković, Ivan; Zdilar, Slaven

Institutional repository: Repository of University Department for Forensic Sciences

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Kasum, J., Jerković, I. & Zdilar, S. (2022). Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example. Policija i sigurnost, 31. (1/2022), 29-38. Retrieved from https://urn.nsk.hr/urn:nbn:hr:227:529113

Kasum, Josip, et al. "Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example." Policija i sigurnost, vol. 31, no. 1/2022, 2022, pp. 29-38. https://urn.nsk.hr/urn:nbn:hr:227:529113

Kasum, Josip, Ivan Jerković and Slaven Zdilar. "Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example." Policija i sigurnost 31, no. 1/2022 (2022): 29-38. https://urn.nsk.hr/urn:nbn:hr:227:529113

Kasum, J., Jerković, I. and Zdilar, S. (2022) 'Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example', Policija i sigurnost, 31(1/2022), pp. 29-38. Available at: https://urn.nsk.hr/urn:nbn:hr:227:529113 (Accessed 06 November 2024)

Kasum J, Jerković I, Zdilar S. Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example. Policija i sigurnost [Internet]. 2022 [cited 2024 November 06];31(1/2022):29-38. Available at: https://urn.nsk.hr/urn:nbn:hr:227:529113

J. Kasum, I. Jerković and S. Zdilar, "Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example", Policija i sigurnost, vol. 31, no. 1/2022, pp. 29-38, 2022. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:227:529113. [Accessed: 06 November 2024]

Metadata
Title (english)Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example
Title (english)Establishing a datum point at the crime scene using a single GPS device: detecting and minimizing error in a simulated case example
AuthorJosip Kasum
AuthorIvan Jerković
AuthorSlaven Zdilar
Author's institutionUniversity of Split
University Department of Forensic Sciences
Scientific / art field,
discipline and subdiscipline		INTERDISCIPLINARY AREAS OF KNOWLEDGE
Cognitive Science (Natural, Technical, Biomedical and Healthcare, Social and Humanistic Sciences)
Scientific / art field,
discipline and subdiscipline		SOCIAL SCIENCES
Security and Defense Science
Abstract (croatian)
Globalni položajni sustav (engl. Global Positioning System - GPS) standardno je sredstvo za određivanje f iksne točke mjerenja na vanjskim mjestima događaja na kojima nema fiksnih objekata i prepoznatljivih točaka. Ipak, GPS je osjetljiv na brojne pogreške koje se pojavljuju u različitim intenzitetima i u različitim vremenskim intervalima te nepovoljno utječu na točnost određivanja položaja. U izloženome slučaju, ispitana je pogreška određivanja položaja s pomoću jednoga GPS uređaja, kao i učinkovitost smanjenja pogreške s pomoću uprosječivanja većega broja koordinata prikupljenih na istoj točki u širemu vremenskom intervalu. Rezultati su pokazali znatne varijacije između stvarnoga položaja i položaja određenoga GPS-om tijekom razmatranoga vremena; što upućuje na to da jednostruko očitavanje GPS položaja nije prikladno za određivanje fiksne točke mjerenja u forenzičnome kontekstu. Međutim, kada se uprosječi određeni broj točaka prikupljenih na istome položaju – periodička kolebanja pogreške GPS-a manje utječu na točnost i pogreška linearno opada. Kako bi se pogreška utvrđivanja položaja svela na najmanju moguću mjeru, predlaže se razvijanje modela za primjenu GPS-a kojim bi se razmotrila prihvatljiva razina pogreške, dostupna oprema i posebnosti različitih mjesta događaja te potanko odredio način i tijek smanjenja pogreške metodom uprosječivanja.
Abstract (english)
The Global Positioning System (GPS) is a standard tool for establishing a datum point at the outdoor crime scenes that lack fixed objects or landmarks. However, GPS is prone to multiple errors that occur with a different intensity in different time intervals and degrade the accuracy of the positioning. In the present simulated case, we have examined the error of establishing a position using a single hand-held GPS unit, as well as the efficiency of reducing the error by averaging multiple coordinates collected at the same spot through the time. The results have shown great variations between the actual position and position obtained by GPS through collection time, demonstrating that a single GPS reading is not a reliable tool for establishing an accurate datum point in a forensic context. However, when a sufficient number of fixes is averaged, periodical variations of GPS error less affect accuracy, and error linearly decreases. To minimize the error of positioning in forensic cases, we suggest developing a model for GPS application that considers the acceptable degree of error, available equipment, the specificity of the crime scene location and defining a detailed workflow for reducing the error with the averaging method.
Keywords (croatian)
Keywords (english)
Languageenglish
Languageenglish
Publication typeScientific paper - Preliminary note / Short communication
Publication statusPublished
Peer reviewPeer review
Publication versionPublished version
Journal titlePolicija i sigurnost
Numberingvol. 31, no. 1/2022, pp. 29-38
p-ISSN1330-0229
e-ISSN1848-428X
URN:NBNurn:nbn:hr:227:529113
Publication2022
Document URLhttps://hrcak.srce.hr/276217
Type of resourceText
Access conditionsOpen access
Terms of useLicence Attribution 4.0 International (CC BY 4.0) icon
Created on2024-06-10 12:31:37