Shiptrack detection algorithm study
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Authors
Giampaolo, Vincent F.
Subjects
Shiptrack
Anomalous Cloud line
AVHRR
Anomalous Cloud line
AVHRR
Advisors
Durkee, Philip A.
Wash, Carlyle H.
Date of Issue
1992-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Shiptracks are known to be a relatively common phenomenon, often appearing in
AVHRR channel 3 imagery as anomalous, curvilinear cloud lines. Despite their
significance to remote ship surveillance studies, the formation mechanisms responsible
for shiptrack production are still largely unknown and their specific characteristics still
undefined.
A shiptrack detection algorithm being developed at the Naval Postgraduate School
seeks to objectively detect and locate shiptracks on AVHRR imagery. This algorithm is a
major step in objectively defining specific shiptrack characteristics and automating the
search for additional shiptrack examples. The purpose of this study was to outline the
logic of the detection algorithm and present a subjective performance summary of its
usefulness.
After careful analysis of the algorithm output files on several full satellite passes, it
was determined that the algorithm is capable of successfully detecting up to 65% of the
fresh shiptracks within a full pass AVHRR image with a false detection rate of only 1.31
tracks per million square kilometers. This performance is likely to improve further with
continued work focused on designing adequate filters to categorically reject many of the
recurring false detections.
Type
Thesis
Description
Series/Report No
Department
Meteorology and Oceanography
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
97 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.