Tuesday, September 18, 2012

'Lost' City of Atlantis: fact & fable

A 1669 map by Athanasius Kircher put Atlantis in the middle of the Atlantic Ocean (original)

From LiveSciences

Atlantis is a legendary "lost" island subcontinent often idealized as an advanced, utopian society holding wisdom that could bring world peace.
The idea of Atlantis has captivated dreamers, occultists, and New Agers for generations.

In the 1800s, mystic Madame Blavatsky claimed that she learned about Atlantis from Tibetan gurus; a century later, psychic Edgar Cayce claimed that Atlantis (which he described as an ancient, highly evolved civilization powered by crystals) would be discovered by 1969.
In the 1980s, New Age mystic J.Z. Knight claimed that she learned about Atlantis from Ramtha, a 35,000-year-old warrior spirit who speaks through her.
Thousands of books, magazines and websites are devoted to Atlantis, and it remains a popular topic.

Map of the New World by Sebastian Muller, 1540, showing the name "Atlantis Island"

The origins of Atlantis

Unlike many legends whose origins have been lost in the mists of time, we know exactly when and where the story of Atlantis first appeared.
The story was first told in two of Plato's dialogues, the Timaeus and the Critias, written about 330 B.C.

Though today Atlantis is often conceived of as a peaceful utopia, the Atlantis that Plato described in his fable was very different.
In his book Frauds, Myths and Mysteries: Science and Pseudoscience in Archaeology, professor of archaeology Ken Feder summarizes the story: "a technologically sophisticated but morally bankrupt evil empire — Atlantis — attempts world domination by force.
The only thing standing in its way is a relatively small group of spiritually pure, morally principled, and incorruptible people — the ancient Athenians. Overcoming overwhelming odds ... the Athenians are able to defeat their far more powerful adversary simply through the force of their spirit. Sound familiar? Plato's Atlantean dialogues are essentially an ancient Greek version of Star Wars."

As propaganda, the Atlantis legend is more about the heroic Athens than a sunken civilization; if Atlantis really existed today and was found, its residents would probably try to kill and enslave us all.

It's clear that Plato made up Atlantis as a plot device for his stories because there no other records of it anywhere else in the world.
There are many extant Greek texts; surely someone else would have also mentioned, at least in passing, such a remarkable place.
There is simply no evidence from any source that the legends about Atlantis existed before Plato wrote about it.

 The "Atlantis Insula" or map of "Atlantis Island" by French cartographer Guillermo Sanson, 1661.

The 'lost' continent

Despite its clear origin in fiction, many people over the centuries have claimed that there must be some truth behind the myths, speculating about where Atlantis would be found.
Countless Atlantis "experts" have located the lost continent all around the world based on the same set of facts.
Candidates — each accompanied by their own peculiar sets of evidence and arguments — include the Atlantic Ocean, Antarctica, Bolivia, Turkey, Germany, Malta and the Caribbean.

Plato, however, is crystal clear about where Atlantis is: "For the ocean there was at that time navigable; for in front of the mouth which you Greeks call, as you say, ‘the pillars of Heracles,’ (i.e., Hercules) there lay an island which was larger than Libya and Asia together."
In other word it lies in the Atlantic Ocean beyond "the pillars of Hercules" (i.e., the Straits of Gibraltar, at the mouth of the Mediterranean).
Yet it has never been found in the Atlantic, or anywhere else.

No trace of Atlantis has ever been found despite advances in oceanography and ocean floor mapping in past decades.
For nearly two millennia readers could be forgiven for suspecting that the vast depths might somehow hide a sunken city or continent.
Though there remains much mystery at the bottom of the world's oceans, it is inconceivable that the world's oceanographers, submariners, and deep-sea probes have some how missed a landmass "larger than Libya and Asia together."

Furthermore plate tectonics demonstrate that Atlantis is impossible; as the continents have drifted, the seafloor has spread over time, not contracted.
There would simply be no place for Atlantis to sink into.
As Ken Feder notes, "The geology is clear; there could have been no large land surface that then sank in the area where Plato places Atlantis.
Together, modern archaeology and geology provide an unambiguous verdict: There was no Atlantic continent; there was no great civilization called Atlantis."

Theosophical map of Atlantis : Poseidonis

Myth from misinterpretation

The only way to make a mystery out of Atlantis (and to assume that it was once a real place) is to ignore its obvious origins as a moral fable and to change the details of Plato's story, claiming that he took license with the truth, either out of error or intent to deceive.
With the addition, omission, or misinterpretation of various details in Plato's work, nearly any proposed location can be made to "fit" his description.

Yet as writer L. Sprague de Camp noted in his book Lost Continents, "You cannot change all the details of Plato's story and still claim to have Plato's story.
That is like saying the legendary King Arthur is 'really' Cleopatra; all you have to do is to change Cleopatra's sex, nationality, period, temperament, moral character, and other details, and the resemblance becomes obvious."

The Atlantis legend has been kept alive, fueled by the public's imagination and fascination with the idea of a hidden, long-lost utopia.
Yet the "lost city of Atlantis" was never lost; it is where it always was: in Plato's books.

Monday, September 17, 2012

Canada CHS update in the Marine GeoGarage


31 charts have been updated (August 30, 2012) :
    • 1230    PLANS PENINSULE DE LA GASPESIE       
    • 1313    BATISCAN TO LAC SAINT-PIERRE       
    • 1316    PORT DE QUEBEC       
    • 1351A    BASSIN DE CHAMBLY TO ILE SAINTE-THERESE       
    • 1351B    ILE SAINTE-THERESE TO POINTE LA MEULE       
    • 1351C    POINTE LA MEULE TO POINTE NAYLOR       
    • 1351D    POINTE NAYLOR TO LAKE CHAMPLAIN       
    • 1429    CANAL DE LA RIVE SUD       
    • 1430    LAC SAINT-LOUIS       
    • 1510A    LAC DES DEUX MONTAGNES       
    • 1510B    LAC DES DEUX MONTAGNES       
    • 3602    APPROACHES TO JUAN DE FUCA STRAIT       
    • 3671    BERKLEY SOUND       
    • 4002    GULF OF ST. LAWRENCE       
    • 4010    BAY OF FUNDY INNER PORTION
    • 4024    CHALEUR BAY ATO ILES DE    LA MADELEINE
    • 4026    HAVRE-SAINT-PIERRE ND CAP DES ROSIERS TO POINTE DES MONTS
    • 4114    CAMPOBELLO ISLAND       
    • 4115    PASSAMAQUODDY BAY AND ST CROIX RIVER       
    • 4140    AVON RIVER AND APPROACHES   
    • 4211    CAPE LAHAVE TO LIVERPOOL BAY       
    • 4240    LIVERPOOL HARBOUR TO LOCKEPORT HARBOUR       
    • 4279    BRAS D'OR LAKE       
    • 4379    LIVERPOOL HARBOUR       
    • 4459    SUMMERSIDE HARBOUR AND APPROACHES
    • 4471    BAIE AU SAUMON TO BAIE DES HOMARDS       
    • 4486    CHALEUR BAY       
    • 4498    PUGWASH HARBOUR AND APPROACHES
    • 4905    CAPE TORMENTINE TO WEST POINT       
    • 4909    BUCTOUCHE HARBOUR       
    • 4913    CARAQUET HARBOUR  BAIE DE SHIPPEGAN  AND MISCOU HARBOUR
    • 4921    PLANS- CHALEUR BAY - NORTH SHORE
    • 4950    ILES DE LA MADELEINE       
    • 4954    CHENAL DU HAVRE DE LA GRANDE ENTRE       
    • 4955    HAVRE-AUX-MAISONS        

    So 688 charts (1659 including sub-charts) are available in the Canada CHS layer. (see coverage)

    Note : don't forget to visit 'Notices to Mariners' published monthly and available from the Canadian Coast Guard both online or through a free hardcopy subscription service.
    This essential publication provides the latest information on changes to the aids to navigation system, as well as updates from CHS regarding CHS charts and publications.
    See also written Notices to Shipping and Navarea warnings : NOTSHIP

    Sea cameras scan the waves for smugglers

    Tracking multiple targets from a camera installed on a buoy.
    The buoy is deployed near a channel.

    From NewScientist

    On 6 September, at least 61 migrants seeking refuge in Europe drowned in the Aegean Sea off the coast of Turkey when their boat hit rocks.


    A day later another migrant boat sank off Lampedusa, Italy - and dozens are feared dead.

    A CCTV system for the ocean could help coastguards detect these overcrowded boats sooner, and perhaps save lives.

    Buoys fitted with cameras have long been thought to be the best means to watch the seas.
    They would photograph vessels as they passed along the horizon, sending images to coastguards via satellite.
    Until now, though, this idea has been blocked by the inability of buoy-mounted cameras to capture clear, stable pictures in the ocean's swell.

    Camera that is attached to the untethered buoy will provide images of several possible categories of horizon images. 
    (a)–(d) Images with horizon clearly discernable. 
    (e) Camera points to the sky and sky is the only scenery visible in the image. 
    (f) Image of water surface only. 
    (g) Objects such as ships when they take a big fraction of the field of view may seriously affect horizon detection. 
    (h) Blur that comes from water splashes is another factor affecting horizon detection.


    Chad Lembke and colleagues at the University of South Florida in St Petersburg have designed an algorithm that enables a camera to detect the true horizon - rather than the edge of a nearby wave - even as it is tossed about in the open ocean.
    The algorithm identifies candidate edges that might be the horizon, and homes in on the correct one using the colour change between sea and sky.

     Consecutive frames of a video sequence exhibit high magnitude non-linear intra-frame motion in (a)–(c) which is the result of rapid camera motion.
    (d) shows registration of (a)–(c) in one coordinate system.
    (e) shows the values of one-dimensional normalized cross-correlation scaled in the range [0..1] during registration of frames (a) and (b) along the horizon line.
    The peak corresponds to the optimal alignment along the horizon line.

    The camera then automatically takes a picture or video of any objects whose outline rises above the horizon.
    The software ignores everything else, which reduces the computational power needed and so also the running power.
    This makes it useful for long-term use at sea, says Lembke.
    The power would come from solar, wind or wave action, he says.

    Steps of the segmentation algorithm: 
    (a) original image; (b) color-gradient filter; (c) thresholding; (d) filtering; (e) output.

    In more than 500 tests, the prototype correctly detected and tracked vessels up to 300 metres away 88 per cent of the time (Ocean Engineering, doi.org/h9g).
    By refining the algorithm's parameters, Lembke's team hopes to reach 98 per cent.
    And a better camera should be able to pick out ships up to a kilometre away, Lembke says.
    As well as detecting boats carrying migrants, the system could issue wireless alerts warning of the possible presence of pirates or drug smugglers.

    The idea has promise, says John Wills, technical director of the Institute of Marine Engineering, Science and Technology in London.
    "This proposal might help support the vital role of identification of potentially hostile craft at sea, as long as some simple practical issues, such as keeping the lens clean of saltwater spray, do not inhibit its operation."

    Sunday, September 16, 2012

    Alamar


    Before their inevitable farewell, Jorge a young man of Mayan roots and Natan, his half Italian son, embark on an epic journey into the open sea.

     A young boy and his father learn about living in harmony with nature in this languid drama from filmmaker Pedro Gonzalez-Rubio.


    A man from Mexico (Jorge Machado) travels to Italy and falls in love with a beautiful local woman (Roberta Palombini).
    Their feelings for one another are strong, but they prove to be short lived, and when they decide to beak up after the birth of their son Natan, he returns to Mexico while she stays in Italy and takes primary custody of the child.
    However, the father strives to remain a presence in his son's life, and the boy visits his father at least once a year.
    As the five-year-old Natan travels to Mexico, his father has joined the family' fishing operation near the coral reefs of Banco Chinchorro.
    Living in an elevated cottage near the shore, Natan and his family devote their summer to an idyllic existence, spending their days catching the plentiful fish and observing the wildlife, and their nights sitting by the fire and admiring the stars.
    To the father, this simple life teaches an important lesson of existing in peace with the natural world, and Natan comes to see himself as being as much a part of this environment as the fish, the waterfowl and the seaweed.

    Links :

    Saturday, September 15, 2012

    Hermit crab migration



    The Caribbean is known for its beautiful beaches.
    Just don't go on a day like this one.
    Watch as "millions and millions" of hermit crabs journey on their annual migration and take over a beach in this remarkable video.

    Videographer Steve Simonsen was on the scene to document this incredible sight. As he describes it, "[My friend] Pam told me it was a migration of soldier crabs also called hermit crabs and there were millions and millions of them she likened it to the migrations of Serengeti. I didn't need to hear anymore, I loaded my car with cameras and was out the door. Pam told me that this began this morning at sunrise at Nanny point near Concordia."

    This stunning migration took place last week on St. John Island, part of the Virgin Islands.
    >>> geolocalization with the Marine GeoGarage <<<