Encounter detection using visual analytics to improve maritime domain awareness
Download
Author
Hanna, Michael J.
Date
2015-06Advisor
Gareen, David A.
Scrofani, James W.
Second Reader
Pilnick, Steven E.
Metadata
Show full item recordAbstract
A visual analytics process to detect encounters between vessels from ship position data is developed in this thesis. An archive of historical position records is pre-processed and filtered to provide input for an encounter detection algorithm. The algorithm arranges the position records into a set of sorted lists (SSL) so that only a minimum number of records need to be compared. The algorithm performs a single sweep over the record set to arrange it into a SSL and simultaneously find the encounters. To avoid problems due to discrete sampling, an interpolation of the data is performed when the sampling is too sparse. To accommodate large data sets, a divide-and-conquer approach using a sliding spatial window is developed. In post-processing, the elementary encounters are grouped into composite encounters by collecting elementary encounters occurring between the same vessels. Additionally, the composite encounters are input into a visual analytics tool where each composite encounter is represented as a layer on a map. Patterns of life analysis and investigations of potential anomalous activity are performed by zooming in on encounter areas of interest. The development of a visual analytics process to identify vessels of interest is the significant result of this thesis.
Rights
Copyright is reserved by the copyright owner.Collections
Related items
Showing items related by title, author, creator and subject.
-
Movements and spatial use of odontocetes in the western main Hawaiian Islands: results from satellite-tagging and photo-identification off Kaua‘i and Ni‘ihau in July/August 2011
Baird, Robert W.; Webster, Daniel L.; Schorr, Gregory S.; Aschettino, Jessica M.; Gorgone, Antoinette, M.; Mahaffey, Sabre D. (2012);Although considerable information is available on residency patterns and spatial use of odontocetes in the eastern half of the Hawai‘i Range Complex (HRC), much less is known about odontocetes in the western half of the ... -
Image compression scheme for network transmission
Lim, Seng (Monterey, California. Naval Postgraduate School, 1995-03);In this thesis a scheme is proposed for still image compression for realtime transmission over a packet switched network. A layered image compression scheme based on the quad tree decomposition technique (QTD) is developed. ... -
CIVIL RIGHTS AUDITORS: DEFINING REASONABLE TIME, PLACE, AND MANNER RESTRICTIONS ON FIRST AMENDMENT ACTIVITIES
Cummings, Gary (Monterey, CA; Naval Postgraduate School, 2019-12);Police increasingly encounter citizens who challenge constitutional boundaries between civil rights and police power. These so-called “civil rights auditors” and “copwatchers” record government officials with cell phones ...