Results 311 to 320 of about 92,051 (340)
Some of the next articles are maybe not open access.
Applied Optics, 1982
The design and performance of a short-pulse high-repetition-rate CuBr laser suitable for bathymetry is described. The pulse width and peak power were 4.5 nsec and 30 kW, respectively, corresponding to 140 microJ/pulse. These conditions occurred at a repetition rate of 16 kHz and an overall efficiency of 0.14% within a compact long-lived sealed-off ...
D W, Feldman, C S, Liu, I, Liberman
openaire +2 more sources
The design and performance of a short-pulse high-repetition-rate CuBr laser suitable for bathymetry is described. The pulse width and peak power were 4.5 nsec and 30 kW, respectively, corresponding to 140 microJ/pulse. These conditions occurred at a repetition rate of 16 kHz and an overall efficiency of 0.14% within a compact long-lived sealed-off ...
D W, Feldman, C S, Liu, I, Liberman
openaire +2 more sources
International Journal of Remote Sensing, 1986
Abstract Through an extensive literature review the results of previous lidar investigations in Australia, Canada, Sweden, the U.S.A. and West Germany have been evaluated. Based on these findings estimates are given for the anticipated depth capability, measurement accuracy and operational constraints for a laser system in U.K. waters. Consideration is
K. MUIRHEAD, A. P. CRACKNELL
openaire +1 more source
Abstract Through an extensive literature review the results of previous lidar investigations in Australia, Canada, Sweden, the U.S.A. and West Germany have been evaluated. Based on these findings estimates are given for the anticipated depth capability, measurement accuracy and operational constraints for a laser system in U.K. waters. Consideration is
K. MUIRHEAD, A. P. CRACKNELL
openaire +1 more source
2010
We want to measure water depth and chlorophyll content on coastal areas from satellite. This should be done using a green laser, which partly is transmitted on the sea surface and partly reflected. We want thereby to detect two return signals by help from a avalanche photodiode.
Brassøe, Mathias +2 more
openaire +1 more source
We want to measure water depth and chlorophyll content on coastal areas from satellite. This should be done using a green laser, which partly is transmitted on the sea surface and partly reflected. We want thereby to detect two return signals by help from a avalanche photodiode.
Brassøe, Mathias +2 more
openaire +1 more source
Airborne electromagnetic bathymetry
GEOPHYSICS, 1984Airborne electromagnetic techniques provide an efficient means for determining the bathymetry of shallow seas and coastal regions. Offshore time‐domain data collected with the INPUT® system may be interpreted quickly and inexpensively using the simple table look‐up algorithm described here.
A. Becker +3 more
openaire +1 more source
Airborne electromagnetic bathymetry
Geoexploration, 1991Abstract An experimental airborne electromagnetic (AEM) survey was carried out in the Cape Cod Bay area to investigate the potential of extracting bathymetric information over a shallow ocean. A commercially available Dighem III AEM System was used for the survey without any significant modification. The helicopter-borne system operated at 385 Hz and
I.J. Won, K. Smits
openaire +1 more source
1990
Abstract The oceanic regions located north of the Arctic Circle are the Arctic Ocean, the Norwegian-Greenland Sea, and Baffin Bay (Plate 1). The latter is described in Keen and Williams (1990). Despite the bold isobaths in Plate 1, the bathymetry of the Arctic Ocean is still poorly known. Most of the Norwegian-Greenland Sea, on the other
G. L. Johnson +2 more
openaire +1 more source
Abstract The oceanic regions located north of the Arctic Circle are the Arctic Ocean, the Norwegian-Greenland Sea, and Baffin Bay (Plate 1). The latter is described in Keen and Williams (1990). Despite the bold isobaths in Plate 1, the bathymetry of the Arctic Ocean is still poorly known. Most of the Norwegian-Greenland Sea, on the other
G. L. Johnson +2 more
openaire +1 more source
2010
Smoothing bathymetry is a necessary step of any run of ROMS. Here the software bathymetry is demonstrated that allows optimal solution of the problem for a fixed roughness factor.
Janeković, Ivica +1 more
openaire +1 more source
Smoothing bathymetry is a necessary step of any run of ROMS. Here the software bathymetry is demonstrated that allows optimal solution of the problem for a fixed roughness factor.
Janeković, Ivica +1 more
openaire +1 more source
Rapid estimation of bathymetry from multispectral imagery without in situ bathymetry data
Applied Optics, 2019Optimization-based semi-analytical methods (OSMs) and empirical methods (EMs) have been developed to derive bathymetry maps from satellite-based multispectral data of coral reefs, allowing for the management, monitoring, and protection of coral reefs.
Yongming Liu +7 more
openaire +2 more sources
IEEE Journal of Oceanic Engineering, 1996
For many years, GLORIA has been producing sonar images of the deep ocean floor. In the mid-1980's, the SeaMARC II system came to prominence producing depth values as well as sonar images. The basic method compares the phases of the signals returning from the seafloor to two rows of transducers. The phase differences are converted into angles of arrival
T.P. Le Bas +3 more
openaire +1 more source
For many years, GLORIA has been producing sonar images of the deep ocean floor. In the mid-1980's, the SeaMARC II system came to prominence producing depth values as well as sonar images. The basic method compares the phases of the signals returning from the seafloor to two rows of transducers. The phase differences are converted into angles of arrival
T.P. Le Bas +3 more
openaire +1 more source