Saturday, December 12, 2020

Old nautical map of Chausey island

Map of main island of Chausey (France) by the British Admiralty, which seems to date from 1828, mentioning the names of the French cutters and English ships anchored in the Sound
(note in passing their way of anchoring, one anchor on each side at almost 180° with sometimes a third one behind).
 
Note also the sort of bastion around the beacon that was set up at the top of the hill of the future semaphore.
courtesy of Hervé Hillard

Chausey (SHOM nautical chart) with the GeoGarage platform
 
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Friday, December 11, 2020

France & misc. (SHOM) layer update in the GeoGarage platform


174 nautical raster charts updated & 2 charts replaced

Norway (NHS) update in the GeoGarage platform

126 nautical raster charts updated 

The Nature Conservancy publishes first-ever detailed maps of all Caribbean coral reefs


An aerial drone is used to gather habitat imagery in Soufriere-Scott's Head Marine Reserve in Dominica.
© Steve Schill for TNC

From Nature by Rachel Winters and Jessica Wiseman

High-resolution maps of the underwater habitats of the entire Caribbean have the potential to transform marine conservation and significantly enhance our knowledge of the ocean.

Today, The Nature Conservancy (TNC), one of the world’s leading conservation organizations, along with partners, published detailed maps of important shallow underwater habitats throughout the entire Caribbean — including all shallow water coral reefs.
For the first time ever, countries and territories now have a clear picture of the habitats found beneath the waves of the Caribbean.
These revolutionary maps will help guide the sustainable use and protection of marine resources for island nations in which 60% of living coral has been lost in the past few decades alone.


 
These maps were created by stitching together tens of thousands of high-resolution satellite images, and in some places using aerial fly-over technology, drones, and divers to dig deeper and validate the data.
By utilizing data captured from outer space to undersea, scientists were able to map and more accurately interpret the coastal ecosystems throughout the Caribbean.
Having accurate and complete underwater habitat data for this region means that there is now cutting-edge guidance available to inform the sustainable use of marine resources on which 44 million Caribbean residents depend.

“You cannot protect what you don’t know is there.
Having access to these maps is a game-changing achievement for the Caribbean.
Thirty countries and territories finally have access to better, more detailed information about their underwater habitats to help them better protect marine areas, support sustainable livelihoods and prioritize their adaptation to potential climate change impacts,” said Dr.
Robert Brumbaugh, Executive Director of The Nature Conservancy’s Caribbean Division.
“Understanding and protecting natural resources is critical to the economic success of these countries.”

TNC's Dr. Steve Schill conducts field surveys in the waters of Grand Cayman to support interpretation of data collected via aerial drone.
© George Raber.jpg
 
Roughly half of all livelihoods in Caribbean communities depend on healthy nearshore and coastal habitats, including fishing and tourism.
According to a study published by TNC in 2019, every year coral reefs and reef-associated activities generate an estimated $7.9 billion in economic value to the tourism industry and draw nearly 11 million visitors to Caribbean islands.
These maps are intended to inform a diverse array of conservation and policy decisions to protect and restore these essential coastal areas that people depend on.
Decision-makers across the region can now use these new maps to identify areas optimal for coral restoration activities, guide climate change adaptation, and identify the best locations for establishing marine protected areas that successfully balance protection and diverse uses.

“The scope of these maps is unprecedented in the region, and the opportunities they unlock to provide a better future for Caribbean ecosystems, and the millions of people who depend upon them, are astonishing” commented Dr.
Joseph Pollock, Senior Coral Reef Resilience Scientist for TNC.
“Using traditional approaches, it would have taken approximately 250 million diver hours to map such a large area. New technologies have helped deliver these desperately needed maps at a tiny fraction of the effort and cost.”

An aerial drone is launched to gather habitat imagery off the coast of St. Croix, USVI. 
© Steve Schill for TNC.jpg
 
TNC scientists, in partnership with the Arizona State University Center for Global Discovery and Conservation Science (ASU GDCS), worked with Planet Labs Inc.
to stitch together more than 38,000 high-resolution satellite images – a process similar to putting together a massive puzzle piece by piece.
The finalized maps are now available at CaribbeanMarineMaps.tnc.org and TNC is working with Vulcan Inc.
to make them available on the Allen Coral Atlas in 2021.
These maps reveal in great detail the location of coral reefs, seagrass beds, and other oases of underwater life, making it possible to more accurately monitor the impacts of climate change, measure the effects of hurricanes and identify areas that need protection and restoration.

“Working with TNC to enhance the value of Allen Coral Atlas offerings and data will be a tremendous asset to the coral conservation community,” said Paulina Gerstner, Program Director of the Allen Coral Atlas.
“This high-resolution view of Caribbean shallow reef ecosystems perfectly augments the global mapping work being undertaken by the Atlas partnership.”

Satellite imagery of marine habitats in Jardines de la Reina in Cuba © Planet.jpg

On some islands, researchers combined high-resolution satellite imagery from Planet Labs Inc.
with imaging spectroscopy data captured from ASU’s Global Airborne Observatory (GAO).
The GAO is an airborne laboratory housing advanced Earth imaging technology, developed by Dr.
Greg Asner, Director of ASU GDCS and the GAO.
The airplane’s four integrated remote sensing technologies collect high-resolution data for environmental monitoring.
The findings were then validated with aerial drone imaging and on-site diver surveys.

“The GAO maps provide details about reefs that cannot be gleaned from satellite data, such as the location of corals on the seafloor.
We used these GAO maps, for example, to specifically delineate the best locations for coral outplanting” said Asner.
 
Arizona State University's Global Airborne Observatory flies over Buck Island Reef National Monument, USVI.
© Marjo Aho for TNC.jpg
 
As part of a pilot test on using these maps in the field, the Dominican Republic became the first country to utilize this new technology.
In 2019, TNC and local partners, including Fundación Grupo Puntacana and Fundación Dominicana de Estudios Marinos, led a coral planting event to help restore endangered staghorn corals.
Scientists used the data acquired by the GAO’s fly-over to identify the best locations to plant corals — including where they would be most likely to survive and have greatest positive impact.
This research guided one of the most comprehensive coral planting efforts in the history of the Dominican Republic.

“These maps are now being distributed and made widely available to a variety of stakeholders across the Caribbean.
Working with partners, we will use these maps to strategically expand marine protected areas, inform smarter coral reef restoration, support nature-based solutions against the threats of climate change, and overall catalyze more effective conservation actions” added Dr. Steve Schill, Lead Scientist for TNC’s Caribbean Division.

This work was generously funded by Daniel C. Chung, Kowalski Family Foundation, The Tiffany & Co. Foundation, Community Foundation of the Virgin Islands, J.A. Woollam Foundation, MacArthur Foundation and Paul G. Allen Family Foundation.
 
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Thursday, December 10, 2020

Great Barrier Reef outlook 'critical' as climate change called number one threat to world heritage

Photograph: James Cook University/AFP via Getty Images

From The Guardian by Lisa Cox

The outlook for Australian sites including the Blue Mountains and the Gondwana rainforests has deteriorated, report saysThe outlook for the Great Barrier Reef has worsened from ‘significant concern’ to ‘critical’, the International Union for Conservation of Nature says.

The outlook for five Australian world heritage sites including the Great Barrier Reef, the Blue Mountains and the Gondwana rainforests, has deteriorated, according to a global report that finds climate change is now the number one threat to the planet’s natural world heritage.

The International Union for Conservation of Nature, the official advisory body on nature to the Unesco world heritage committee, has found in its world heritage outlook that climate change threatens a third of the world’s natural heritage sites.
The outlook has been published every three years since 2014.

 
It finds the conservation outlook for the Great Barrier Reef has worsened from “significant concern” to “critical” – the most urgent status under the IUCN system.
The reef suffered its third mass coral bleaching in five years during the 2019-20 summer.

In the aftermath of the 2019-20 bushfire disaster, the Gondwana rainforests – comprising 40 separate reserves between Newcastle and Brisbane – and the Greater Blue Mountains world heritage area have seen their outlook move to “significant concern” in 2020 from “good with some concerns” in 2017.

The fires affected more than 80% of the Blue Mountains world heritage area and more than 50% of the Gondwana rainforests, with the bushfire royal commission finding the disaster was just a glimpse of what climate change would deliver to the country in the future.

Western Australia’s Shark Bay and Ningaloo Coast world heritage sites have deteriorated in the IUCN outlook from “good” to “good with some concerns”.

Other Australian world heritage sites remained in the same categories from previous reports including the Kakadu National Park and Queensland’s wet tropics, which are both listed as “significant concern”.


The renowned coral reef scientist, Terry Hughes, said it was logical the IUCN had moved the Great Barrier Reef into the critical category after three bleaching events in five years.

But he said it didn’t make sense that others, such as the Ningaloo Reef that fringes the Ningaloo Coast, were not also considered critical given the scale of the threat climate change posed to coral reefs worldwide.

“It’s not really credible to say the Barrier Reef is now super vulnerable to climate change but other coral reefs around the world aren’t,” he said.
“Unesco have actually made that case very clearly.”

Australia has 12 natural world heritage sites, four cultural world heritage sites and four mixed world heritage sites.

The report finds climate change is either a very high or high threat to 11 out of the 16 natural and mixed sites and that the “manifold” effects of the climate crisis – including increased frequency and severity of fires, droughts and coral bleaching – were often accompanied by other threats, leading to a poorer outlook overall.

K’gari/Fraser Island, which was ranked “good with some concerns”, is the latest world heritage area to suffer the effects of catastrophic fire, with half of the island burnt in a bushfire that has been alight for six weeks.

On Wednesday, the chair of the next major UN climate summit pointedly thanked Australia’s state and territory governments – but not the Morrison government – for committing to targets of net zero emissions by 2050.

Last month, the IUCN World Conservation Congress passed a motion moved by an alliance of Australian environment groups that called on the Morrison government to show leadership and ensure its planned reforms of Australia’s national environmental laws delivered more for the environment, including world heritage areas.

“Australia’s World Heritage sites are places of outstanding global significance and it is our privilege – and responsibility – to lead in protecting these values, including from the impacts of climate change,” said Rachel Lowry, WWF-Australia’s chief conservation officer.

Lowry said a stronger government plan to address the climate crisis and reduce emissions was “essential for these special places to remain”.

“There is no doubt that if we are to learn from the recent devastating bushfires, as well as the findings in this report, we must commit to regenerating Australia and setting our nation on a pathway where both people and nature benefit,” she said.

The Australian Marine Conservation Society’s Great Barrier Reef campaign manager, Dr Lissa Schindler, said: “The federal government’s refusal to act decisively on climate change is unforgivable when they know that global heating is so dangerous for our reef.

“We call on the federal government to take its role as custodians of our international icon seriously by committing to a pathway compatible with 1.5C of heating in a wide-ranging national climate change policy,” she said.

A spokesman for the federal environment minister, Sussan Ley, said the report reflected the extreme weather events Australia had experience over the past 12 months.
 
Australia's Great Barrier Reef runs the risk of another summer of elevated coral bleaching if cyclones and other rain events don't arrive to "suck out the heat"

He noted the IUCN had reviewed Australia’s protection and management of world heritage sites favourably, which he said was due to the “significant work” of federal, state and territory governments at those sites.

“Australia is committed to playing its role in a global response to climate change, it is investing unprecedented amounts protecting the reef, in bushfire wildlife and habitat recovery and in supporting our world heritage places,” the minister’s spokesman said.

The IUCN’s director general, Bruno Oberle, said countries owed it to future generations to protect the world’s “most precious places”.

He said the report showed “the damage climate change is wreaking on natural world heritage, from shrinking glaciers to coral bleaching to increasingly frequent and severe fires and droughts”.

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