Browsing by Author "Landmark, Knut"
Now showing items 1-8 of 8
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Acoustic seabed classification using QTC IMPACT on single-beam echo sounder data from the Norwegian Channel, northern North Sea
Eidem, Ellen Johanne; Landmark, Knut (2013)Sediment mapping is important for understanding the physical processes, the impact of human activity, and the conditions for marine life on the seabed. For this purpose, the seabed classification tool QTC IMPACT analyses ... -
Bayesian seabed classification using angle-dependent backscatter data from multibeam echo sounders
Landmark, Knut; Solberg, Anne H Schistad; Austeng, Andreas; Hansen, Roy Edgar (2014)Acoustical seabed classification is a technology for mapping seabed sediments. Processed multibeam sonar data yield the variation of the seabed scattering strength with incidence angle, and this paper examines the effect ... -
Density mapping of ship traffic
Aronsen, Morten; Landmark, Knut (2016-11-23)An increasing number of satellites relay information from the Automatic Identification System (AIS) anti-collision system. This has resulted in a global coverage of ship position data, and several commercial service ... -
Hierarchical path planning for walking (almost) anywhere
Landmark, Knut; Messel, Espen (2018)Computerized path planning, not constrained to transportation networks, may be useful in a range of settings, from search and rescue to archaeology. This paper develops a method for general path planning intended to work ... -
Innsamling og beskrivelse av kjerneprøver og grabbprøver fra havbunnen i Forsvarets øvingsfelt i nordlige Nordsjøen 2004-2008
Eidem, Ellen Johanne; Landmark, Knut (2008)I forbindelse med oppmåling av havbunnen i Forsvarets øvingsfelt i den nordlige Nordsjøen har Forsvarets forskningsinstitutt (FFI) tatt 40 kjerneprøver og 37 grabbprøver for undersøkelser av havbunnens beskaffenhet. ... -
A Radon-Transform-Based Image Noise Filter - With Applications to Multibeam Bathymetry
Landmark, Knut; Solberg, Anne H Schistad; Albregtsen, Fritz; Austeng, Andreas; Hansen, Roy Edgar (2015)This paper describes a linear-image-transform-based algorithm for reducing stripe noise, track line artifacts, and motion-induced errors in remote sensing data. Developed for multibeam bathymetry (MB), the method has also ... -
Reducing scalloping in synthetic aperture radar images using a composite image transform
Landmark, Knut; Solberg, Anne H Schistad (2015)In burst mode SAR imaging, echo intensity depends on the target's azimuth position in the antenna pattern. As a result, an amplitude modulation known as scalloping may appear, particularly in ScanSAR images of ocean ... -
Seabed classification of the Navy´s exercise area in the northern North Sea
Eidem, Ellen Johanne; Landmark, Knut (2008)The propagation of sound from ships, explosive charges and sonars is dependent on both topography and the geoacoustic properties of the seabed at low frequencies or in shallow waters. Information about the seabed is therefore ...