Bathymetry from UAV imagery and machine learning

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Category: Metereología y Oceanografía
Published on Tuesday, 10 October 2023 04:37
Written by Administrator2
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ARTICLE

HYDRO INTERNATIONAL

Improving results with refraction corrections

By Panagiotis Agrafiotis • October 13, 2020

Accurate bathymetric mapping of shallow areas is essential for many offshore activities. Through Structure from Motion (SfM) and Multiview Stereo (MVS) techniques, images can provide a low-cost alternative compared to Lidar and sonar systems while offering important visual information. This article presents a new framework for mapping the seabed in clear and calm shallow waters for small- and large-scale surveys using aerial imagery and machine learning to correct the geometric effects of refraction on the 3D point clouds and the imagery.

SfM is a photogrammetric technique for estimating 3D structures from 2D image sequences. It involves acquiring images from several positions relative to the object of interest. To establish

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July 2023: Global air and ocean temperatures reach new record highs

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Category: Metereología y Oceanografía
Published on Tuesday, 03 October 2023 19:47
Written by Administrator2
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DATE:8th August 2023

Bonn, 08/08/2023 

 

Daily global sea surface temperature (°C) averaged over the 60°S–60°N domain plotted as a time series for each year from 1 January 1979 to 31 July 2023. The years 2023 and 2016 are shown with thick lines shaded in bright red and dark red, respectively. Other years are shown with thin lines and shaded according to the decade, from blue (1970s) to brick red (2020s). Data: ERA5. Credit: C3S/ECMWF.   
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Globally averaged surface air temperature for all months of July from 1940 to 2023. Shades

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Visibilidad excepcional en las aguas árticas

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Category: Metereología y Oceanografía
Published on Saturday, 26 August 2023 20:59
Written by Administrator2
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Daniamant lanza un innovador chaleco salvavidas ligero aprobado por SOLAS para viajes árticos: Dan W3 POLAR

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Daniamant, fabricante líder de equipos de seguridad marítima, lanza su última innovación en chalecos salvavidas ligeros, diseñado específicamente para aguas árticas: Dan W3 POLAR.

La luz del chaleco salvavidas recientemente desarrollada establece un nuevo punto de referencia en la industria, proporcionando una eficiencia confiable y un rendimiento óptimo, al tiempo que garantiza una mayor seguridad para los pasajeros y miembros de la tripulación que realizan viajes por el Ártico.

La luz del chaleco salvavidas presenta un rendimiento mejorado en climas fríos, diseñada específicamente para permitir el almacenamiento en temperaturas bajo cero de hasta -52 grados Celsius y

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North Sea wrecks: Toxic legacies of war

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Category: Metereología y Oceanografía
Published on Tuesday, 19 September 2023 19:27
Written by Administrator2
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 Investigating abandoned munitions on the seabed

By Bart De Smet • September 19, 2023

Some 290 shipwrecks lie in the Belgian part of the North Sea alone, with probably more than 1,000 in the entire North Sea, many of them silent witnesses to the two world wars. Until recently, the environmental impact of these wrecks was largely unknown and, as far as the presence of munitions is concerned, they represented a true Pandora’s box. The North Sea Wrecks project has changed this. Researchers examined the munitions and the possible release of toxic substances from a few selected wrecks in the North Sea. Are these wrecks really leaving us with a toxic legacy of war, or are we worrying about nothing? In this article, we try to discover the answer.

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How is climate change impacting the world’s ocean

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Category: Metereología y Oceanografía
Published on Tuesday, 22 August 2023 03:13
Written by Administrator2
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https://www.un.org/en/climatechange/

science/climate-issues/ocean-impacts

The ocean has long taken the brunt of the impacts of human-made global warming, says UN Climate Change. As the planet’s greatest carbon sink, the ocean absorbs excess heat and energy released from rising greenhouse gas emissions trapped in the Earth’s system. Today, the ocean has absorbed about 90 percent of the heat generated by rising emissions. 

As the excessive heat and energy warms the ocean, the change in temperature leads to unparalleled cascading effects, including ice-melting, sea-level rise, marine heatwaves, and ocean acidification. 

These changes ultimately cause a lasting impact on marine biodiversity, and the lives and livelihoods of coastal communities and beyond - including around 680 million people living in low-lying coastal areas, almost 2 billion who live in half of

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