NDLI: Remote sensing using laser projection photogrammetry for underwater surveys

Content Provider	IEEE Xplore Digital Library
Author	Kocak, D.M. Jagielo, T.H. Wallace, F. Kloske, J.
Copyright Year	2004
Description	Author affiliation: Green Sky Imaging LLC, Vero Beach, FL, USA (Kocak, D.M.)
Abstract	Washington Department of Fish and Wildlife researchers combined the Laser/Video Photogrammetric System (originally presented at MTS/IEEE OCEANS 2002 Conference) with precision navigation to provide an efficient "tool" for producing quantitative benthic survey data. In addition to the roll/pitch motion reference sensor, CCD video camera and three microlasers utilized in the original system, a Doppler velocity log (DVL), ring laser gyro (RLG), ultra short base line sonar (USBL) and Integrated Positioning System (IPS) software were added to provide more precise navigation. This precision allows for geo-referencing, and hence mosaicking of user specified sized areas within an image along a transect survey. Two additional lasers were also added to test for improvement of scale measurements. Custom software is used to automatically process video data at user selected distance intervals. The software locates the reference lasers in an image and optical triangulation is used to compute range to a bottom plane in the field-of-view. Using this information and measurements recorded from the motion sensor, the spatially variant magnification is determined over the entire field-of-view using a simple algorithm. As a result, a variety of parameters are estimated using image-processing techniques including: perspective overlays, range to a point or location, scale in any region of the image, and area measurements. This paper briefly reviews the original system, describes the enhancements, and summarizes data from two cruises. In the most recent cruise during October, 2003 the system was deployed in the Channel Islands National Marine Sanctuary located off the coast of southern California. Mounted onboard the DSV DELTA submersible, the system collected numerous hours of video and navigation data from survey transects. Data were collected from both randomly sampled sites and selected areas where ground-truth targets were placed. Methods to improve these results are also discussed. Deployment of a third generation system is expected in 2005 onboard an AUV. We expect the final system will prove valuable for estimating the abundance of commercially and recreationally exploited groundfish species within a study area using stratified random video transect methods. This unintrusive, direct observation technique affords a means to estimate the density of certain benthic fish species in high relief areas that are not accessible to routine trawl survey methods. Differences in fish densities between trawlable and untrawlable habitats have clear implications for estimation of abundance for a number of fish species including rockfish.
Starting Page	1451
Ending Page	1454
File Size	503510
Page Count	4
File Format	PDF
ISBN	0780387422
DOI	10.1109/IGARSS.2004.1368693
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Remote sensing Marine animals Sonar navigation Videoconference Ring lasers Sea measurements Wildlife Oceans Sensor systems Charge coupled devices
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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