cartome.org

19 June 2001

Source: http://postoffice.nrlssc.navy.mil/abstract%2031.htm

PRACTICAL USE OF VIDEO IMAGERY IN NEARSHORE
OCEANOGRAPHIC FIELD STUDIES

K. T. Holland
Naval Research Laboratory
Stennis Space Center, MS 39529-5004
R. A. Holman J. Stanley N. Plant
Oregon State University
Corvallis, OR 97331
T. Lippmann
University of California
La Jolla, CA 92037

Abstract

An approach was developed for using video imagery to quantify naturally occurring physical processes in terms of both spatial dimensions and temporal relationships. This approach is founded on the principles of photogrammetry, accounts for difficulties inherent in the use of video signals, and has been adapted to allow for flexibility of use in a field environment. The complete method is presented, including the derivation of the geometrical relationships relating image and ground coordinates, principles to be considered when working with video signals and the two-step strategy for calibration of the camera model. Examples from field tests indicate that this approach is both accurate and applicable under the conditions typically experienced when sampling in coastal regions. Several applications of the camera model to the measurement of surfzone fluid processes and topographic features are discussed. Although our application of this approach has been directed towards the measurement of nearshore processes and bathymetric features, these same techniques are very likely useful in the study of other oceanographic phenomena.

Sponsored by the Office of Naval Research.

Published in the IEEE Journal of Oceanic Engineering, Vol 22 (1), January 1997.
Naval Research Laboratory Contribution Number NRL/JA/7442 96-0001.
Journal Article