Results 61 to 70 of about 7,708 (206)

Correction of Refraction Effects on Unmanned Aerial Vehicle Structure-from-Motion Bathymetric Survey for Coral Reef Roughness Characterisation

Remote Sensing
Coral reefs play a crucial role in tropical coastal ecosystems, even though these environments are difficult to monitor due to their diversity and morphological complexity and due to their shallowness in some cases.
Marion Jaud, Mila Geindre, Stéphane Bertin, Yoan Benoit, Emmanuel Cordier, France Floc’h, Emmanuel Augereau, Kévin Martins   +7 more
doaj   +1 more source

Towards cost-efficient prospection and 3D visualization of underwater structures using compact ROVs [PDF]

, 2015
The deployment of Remotely Operated Vehicles (ROV) for underwater prospection and 3D visualization has grown significantly in civil applications for a few decades.
De Wulf, Alain, Deruyter, Greet, Paelinck, Mieke, Stal, Cornelis, Vandenbulcke, Annelies   +4 more
core   +1 more source

Red, green, blue color indices as proxy for Symbiodiniaceae cell density and chlorophyll content during coral bleaching

Limnology and Oceanography: Methods, EarlyView.
Abstract Coral bleaching, the breakdown of the symbiosis between the coral host and endosymbiotic microalgae, is the main cause of widespread coral reef degradation. Current visual assessment methods for coral health, including color reference cards, are constrained by subjective human color perception and limited resolution.
Erik Francesco Ferrara, Lavinia Bauer, Giulia Puntin, Friederike Bautz, Sibel Celayir, Marie‐Sa Do, Frederik Eck, Melissa Heider, Pia Wissel, Angelina Arnold, Thomas Wilke, Jessica Reichert, Maren Ziegler   +12 more
wiley   +1 more source

Comparison of three airborne laser bathymetry data sets for monitoring the German Baltic Sea Coast [PDF]

, 2015
Airborne laser bathymetry (ALB) can be used for hydrographic surveying with relative high resolution in shallow water. In this paper, we examine the applicability of this technique based on three flight campaigns.
Ellmer, Wilfried, Heipke, Christian, Niemeyer, Joachim, Song, Yujin, Sörgel, Uwe   +4 more
core   +2 more sources

Impact of parameterization in multiple acoustic index comparisons: practical cases in terrestrial and underwater soundscapes

Remote Sensing in Ecology and Conservation, EarlyView.
Parameter choices in acoustic analyses (sampling frequency, FFT size and window overlap) strongly influence multivariate soundscape separation. Using terrestrial and coral reef recordings, we show that these settings can exaggerate or mask ecological differences, emphasizing the need for parameter sensitivity testing and transparent reporting in ...
Juan C. Azofeifa‐Solano, Miles J. G. Parsons, James Kemp, Rohan M. Brooker, Robert D. McCauley, Shyam Madhusudhana, Mathew Wyatt, Stephen D. Simpson, Christine Erbe   +8 more
wiley   +1 more source

Monitoring the Posidonia Meadows structure through underwater photogrammetry: a case study

2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea), 2022
The Posidonia oceanica meadows represent a fundamental biological indicator for the assessment of the marine ecosystem state of health. They also cover an essential role in the conservation of coastal morphology. The composition, extent and structure of the meadows are conditioned by the biological characteristics of the plant itself and by the ...
Russo, Francesca, Del Pizzo, Silvio, Di Ciaccio, Fabiana, Troisi, Salvatore   +3 more
openaire   +2 more sources

Multi‐Platform Deployments of Low‐Cost Devices for Cetacean Passive Acoustic Monitoring

Remote Sensing in Ecology and Conservation, EarlyView.
Recent advances in affordable, user‐friendly devices offer new opportunities to overcome cost constraints of underwater passive acoustic monitoring (PAM) and expand acoustic data collection. In this study, we deployed low‐cost acoustic recorders and underwater cameras across a range of platforms in the Western Mediterranean, including fishing gear ...
Greta Jankauskaite, François Poisson, Irati Abascal, Javier Menéndez‐Blázquez, Clara Cánovas Pérez, Sofia Conti, Ricardo Sagarminaga, Juan Antonio Raga, David March   +8 more
wiley   +1 more source

UVSD: Software for Detection of Color Underwater Features [PDF]

, 2005
Underwater Video Spot Detector (UVSD) is a software package designed to analyze underwater video for continuous spatial measurements (path traveled, distance to the bottom, roughness of the surface etc.) Laser beams of known geometry are often used in ...
Mamaenko, Anton, Rzhanov, Yuri, Yoklavich, M   +2 more
core   +1 more source

Doing Fieldwork on the Seafloor: Photogrammetric Techniques to yield 3D Visual Models from ROV Video [PDF]

, 2013
Remotely Operated Vehicles (ROVs) have proven to be highly effective in recovering well localized samples and observations from the seafloor. In the course of ROV deployments, however, huge amounts of video and photographic data are gathered which ...
Devey, Colin W., Hansteen, Thor H., Kutterolf, Steffen, Kwasnitschka, Tom   +3 more
core   +1 more source

Detection and documentation of a submerged neolithic pile dwelling settlement using airborne laser bathymetry and multimedia photogrammetry - A case study at lake Mondsee [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
This study presents a comparative analysis of airborne laser bathymetry (ALB) and multimedia photogrammetry for the detection and documentation of a submerged Neolithic pile dwelling settlement in Lake Mondsee, Austria.
K. Riederer, D. Simböck, G. Mandlburger
doaj   +1 more source