Wednesday, October 1, 2014

Did Marco Polo "discover" America?

"Map with Ship" has the informality of a "napkin sketch on vellum," says map expert John Hessler, suggesting its maker was not a trained cartographer.
(Library of Congress, Geography & Map Division)

From Smithsonian by Ariel Sabar

For a guy who claimed to spend 17 years in China as a confidant of Kublai Khan, Marco Polo left a surprisingly skimpy paper trail.
No Asian sources mention the footloose Italian.
The only record of his 13th-century odyssey through the Far East is the hot air of his own Travels, which was actually an “as told to” penned by a writer of romances.
But a set of 14 parchments, now collected and exhaustively studied for the first time, give us a raft of new stories about Polo’s journeys and something notably missing from his own account: maps.

 Marco Polo's Book of Travels mentions a voyage east of Siberia for "forty days."
This expedition to Alaska and the West Coast is documented in this "Map-with-Ship" that was given to the Library of Congress in the 1930s by the Marcian Rossi Family.
Gunnar Thompson has argued in support of the authenticity of this map before the Society for the History of Discoveries; and he has offered to pay for a radiocarbon test of the ancient vellum or sheepskin. (jp2 map file)

If genuine, the maps would show that Polo recorded the shape of the Alaskan coast—and the strait separating it from Asia—four centuries before Vitus Bering, the Danish explorer long considered the first European to do so.
Perhaps more important, they suggest Polo was aware of the New World two centuries before Columbus.

Marco Polo visits the Great Kublaï Khan of China

“It would mean that an Italian got knowledge of the west coast of North America or he heard about it from Arabs or Chinese,” says Benjamin B. Olshin, a historian of cartography whose book, The Mysteries of the Marco Polo Maps, is out in November from the University of Chicago Press. “There’s nothing else that matches that, if that’s true.”


But as Olshin is first to admit, the authenticity of the ten maps and four texts is hardly settled.
The ink remains untested, and a radiocarbon study of the parchment of one key map—the only one subjected to such analysis—dates the sheepskin vellum to the 15th or 16th century, a sign the map is at best a copy.
Another quandary is that Polo himself wrote nothing of personal maps or of lands beyond Asia, though he did once boast: “I did not tell half of what I saw.”

The parchments came to America in the steamer trunks of an enigmatic Italian immigrant named Marcian Rossi.
Rossi landed on Ellis Island as a teenager in 1887 and later told a historian that the documents were passed down through patrician ancestors from an admiral to whom Polo had entrusted them.
The mustachioed, bow-tie-fancying Rossi was a father of six who worked as a tailor in San Jose, California.
He was also a charming, cigar-puffing raconteur, who despite little schooling wrote a sci-fi thriller, A Trip to Mars.

 Colombus Notes on Marco Polo's "Le Livre des Merveilles", latin edition

Might Rossi have conjured a Polo fantasy, too?
“He certainly was enough of a character,” says his great-grandson, Jeffrey Pendergraft, a Houston energy executive who is custodian of the family papers.
But neither Pendergraft nor cartographic experts suspect Rossi of forging the maps.
“The incredible amount of knowledge in them about a whole variety of subjects—I would be very skeptical that my great-grandfather possessed,” Pendergraft says.

When Rossi donated the palimpsest “Map with Ship” to the Library of Congress in the 1930s, even the FBI was stumped.
The agency’s analysis, requested by the library and signed by J. Edgar Hoover, was mum on the question of authenticity.


One reason the parchments have languished since then is their idiosyncrasy.
They tell of people and places absent not just from Polo’s narrative but from known history.
And they’re an awkward fit for the era’s known map styles—Portolan sailing charts, the grids and projections of Ptolemy, and the medieval schematics known as mappae mundi.

The parchments bear inscriptions, some cryptic, in Italian, Latin, Arabic and Chinese.
Olshin, a professor at the University of the Arts in Philadelphia, who spent more than 13 years researching and writing his new book, is the first scholar to fully decode and translate the maps and to trace Rossi’s ancestry, with some success, back to Polo’s Venice.
One of Olshin’s most tantalizing finds are allusions to “Fusang,” an obscure fifth-century Chinese name for a “land across the ocean” that some scholars now contend was America.

One of many Asian junks that Yuan Chinese explorers and Marco Polo could have used in 1285
to map America's West Coast from Alaska to Peru

History says little about Polo’s three daughters. (He had no sons.)
But Fantina, Bellela and Moreta have star turns here, signing their names to some of the parchments and claiming to have drawn them from their father’s “letters,” apparently after his death.
Bellela writes of hitherto untold encounters with a Syrian navigator, a band of lance-toting women in ermine pelts and people on a peninsula “twice as far from China” who wear sealskin, live on fish and make their houses “under the earth.”

Travels made Polo an instant celebrity after his return to Venice, both for his descriptions of faraway lands and for what his countrymen suspected was wild fabrication.
His daughters may have plunged back into their father’s notes in hopes of securing his reputation, surmises Stanley Chojnacki, a University of North Carolina expert on gender relations in 14th-century Venice, and “to claim by reason of defending him a certain measure of respectability and status and importance themselves.”

Links :
  • DailyMail : The incredible map that shows Marco Polo may have discovered America in the the 13th century - 200 years before Christopher Columbus
  • MarcoPoloinSeattle : Marco Polo’s New World Maps (claiming the explorer then went south to Washington state.)
  • Reading Colombus

Tuesday, September 30, 2014

GeoGarage B2B platform proposes ENC nautical charts viewing

Cowes (Island of Wight), UKHO ENC overlayed on Google Maps imagery

Cowes (Island of Wight), UKHO RNC (raster chart) overlayed on Google Maps imagery

The GeoGarage platform serves right now images of vector ENC Electronic navigational charts as a complementary offer to the different raster nautical charts (RNC) layers for its B2B customers.

This implementation of ENCs (worldwide catalogue of 12 618 charts at this date) allows to complete the catalog of available nautical charts (more than 9 000 raster charts) proposed by the Marine GeoGarage platform, for regions where the GeoGarage can't propose -for the moment- raster data (pending licenses with some international Hydrographic Offices).

It can be used in combination with or as a backdrop to other geo-spatial data layers (e.g. Vessel Traffic monitoring, weather) in third-parties web or mobile B2B applications.

Note : these ENC charts can't be used for B2B integrators who plan to use them in public applications (due to restrictions on s-63 data use)

 Hamburg harbour, BSH ENC overlayed on Google Maps imagery

GeoGarage supports a wide variety of ENC data products :

  • s-57 data from international Hydrographic Offices with which Marine GeoGarage got some partnerships
  • s-63 encrypted data (signed specifically for the GeoGarage customer in the Primar / IC-ENC catalogues)

 Countries authorizing ENC publishing for webmapping onshore apps
(not for SOLAS navigation)

 La Garonne river (at Langon), VNF IENC overlayed on Google Maps

Technically,  the GeoGarage platform is developed in accordance with OGC requirements, making it the simple tool for the integration of nautical charts layer in third-parties B2B applications.

 USACE IENC (US) overlayed on Bing Maps with ArcGIS JS viewer

The GeoGarage utilizes a Web Map Service for displaying available ENC in WMS clients such as the Javascript viewers (OpenLayers, Leflet, ArcGIS, or customized Google Maps)

 San Francisco, NOAA ENC overlayed on Google Maps imagery

The display of the vectorial ENC vector data can be configured according the specifications and the business needs of the B2B final integrator :
  • the raster display supporting all the IHO s-52 (ECDIS) symbolization chart settings
  • extended chart object filtering possibility
  • optimizing delivery of chart across the Internet through image tile cache, for quick display of selected areas
 Singapore ENC overlayed on Google Maps imagery

Don't hesitate to contact the GeoGarage team to get some more information about Terms of Use and pricing.

The Aral sea loses its Eastern lobe

acquired August 19, 2014
Satellite images from NASA show that over the last 14 years, one of the world's largest inland bodies of water, the Aral Sea in Central Asia, has almost completely dried up and disappeared.
NASA Earth Observatory image by Jesse Allen, using data from the Level 1 and Atmospheres Active Distribution System (LAADS).
Caption by Kathryn Hansen.
Instrument(s): Terra - MODIS

acquired August 25, 2000

From NASA 

Summer 2014 marked another milestone for the Aral Sea, the once-extensive lake in Central Asia that has been shrinking markedly since the 1960s.
For the first time in modern history, the eastern basin of the South Aral Sea has completely dried.

This image pair from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite shows the sea without its eastern lobe on August 19, 2014 (top).
Substantial changes are apparent when compared to an image from August 25, 2000 (bottom), and again when compared to the approximate location of the shoreline in 1960 (black outline).

"This is the first time the eastern basin has completely dried in modern times," said Philip Micklin, a geographer emeritus from Western Michigan University and an Aral Sea expert.
"And it is likely the first time it has completely dried in 600 years, since Medieval desiccation associated with diversion of Amu Darya to the Caspian Sea."

The Aral Sea circa 1856

In the 1950s and 1960s, the government of the former Soviet Union diverted the Amu Darya and the Syr Darya—the region's two major rivers—to irrigate farmland.
The diversion began the lake's gradual retreat.
By the start of the Terra series in 2000, the lake had already separated into the North (Small) Aral Sea in Kazakhstan and the South (Large) Aral Sea in Uzbekistan.
The South Aral had further split into western and eastern lobes.

 The changes are dramatically documented in a series of images from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite.
By 2000, when this sequence of satellite photos begins, a large portion of the sea had already been drained.
Instead of a single large body of water, there were now two smaller ones: the Northern and Southern Aral Seas.
The Southern Aral Sea shrunk further into two lobes connected by narrow channels at the top and bottom.
In ensuing years, the lobes get smaller and smaller.
A drought from 2005 to 2009 accelerated the changes, NASA says.
Also in 2005, Kazakhstan completed a dam project aimed at shoring up water supplies in the Northern Aral Sea at the expense of the southern portion.
The most recent photo, from August 2014, shows just a thin sliver of water remaining on its western edge.

The eastern lobe of the South Aral nearly dried in 2009 and then saw a huge rebound in 2010.
Water levels continued to fluctuate annually in alternately dry and wet years.

According to Micklin, the desiccation in 2014 occurred because there has been less rain and snow in the watershed that starts in the distant Pamir Mountains; this has greatly reduced water flow on the Amu Darya.
In addition, huge amounts of river water continue to be withdrawn for irrigation.
The Kok-Aral Dam across the Berg Strait—a channel that connects the northern Aral Sea with the southern part—played some role, but has not been a major factor this year, he said.
"This part of the Aral Sea is showing major year-to-year variations that are dependent on flow of Amu Darya," Micklin said.
"I would expect this pattern to continue for some time."

Links :


Monday, September 29, 2014

Flight MH370: New search images reveal seabed details


The floor of the ocean is dotted with the remains of extinct volcanoes, known as seamounts

From BBC by

The team looking for missing flight MH370 has released detailed images of the seabed - revealing features such as extinct volcanoes and 1,400-metre depressions for the first time.
The collection of data from one of the most secret parts of the world is a by-product of the search.
Until now there were better maps of Mars than of this bit of the sea floor.

 Possibility MH370 crash area with the Marine GeoGarage (AHS chart)

The Malaysian Airlines plane vanished without trace on 8 March with 239 people on board.
Twenty-six countries have helped look for the Boeing 777, but nothing has ever been found.
The aircraft was flying from the Malaysian capital, Kuala Lumpur, to Beijing.

There are also depressions on the seabed, some as deep as 1,400 metres

The maps will be used to guide search vehicles close to the seabed

The team at the Australian Transport Safety Bureau (ATSB), which is leading the hunt for the plane, is using sonar to map the new "priority" search area, at the bottom of the Southern Indian Ocean.
After that they will deploy two or three deep-sea vehicles to begin the painstaking, inch-by-inch seabed search for wreckage.
The "priority" area is based on the only piece of hard evidence investigators have, which is a series of brief, electronic "hellos" between the Boeing and a satellite.
It is the equivalent of your mobile phone buzzing next to a loud speaker because it is checking in with a ground station, even when you are not making a call.
But those "hellos" don't give an exact location, just a very rough idea, so the smaller, "priority" area is still 60,000 sq km (23,200 sq miles) - an area roughly the size of Croatia.

 The new maps reveal the "priority" search area in the southern Indian Ocean

However, the data is not designed to pick up the aircraft, as the resolution is too coarse.
Simon Boxall from the National Oceanography Centre says that despite this, it does provide a detailed look at the seabed.
"Those 'bumps' on the sea floor in the flat, featureless plains to the south of Broken Ridge are each bigger than Ben Nevis.
"Five kilometres (3 miles) across and typically rising 1.5km (0.9 miles) from the sea floor. The terrain of the area around Broken Ridge makes the European Alps look like foothills," he said.
Making sonar maps is vital to ensure the team does not crash its deep-water vehicles into ridges and volcanoes. The equipment is pulled along the sea floor by a 10km armoured cable.
Snagging that cable could damage the kit, or even cut it free, so the maps help them avoid any obstructions.
The deep sea search vehicles have sonar that can pick out odd lumps, cameras that can double check if that lump is wreckage or just a rock and an electronic nose that can smell aviation fuel in the water, even if it is heavily diluted.


The operation to find flight MH370 is the most complex search in history.
They may find clues within months.
Or they may never find the aircraft.

Links :

Sunday, September 28, 2014

Velella, "by-the-wind sailors"


The tiny sea creatures, called "by-the-wind sailors," washed ashore in Humboldt, California (above) and other beaches along the West Coast.

From LiveSciences by Tanya Lewis

An invasion is afoot along beaches from Oregon to California: Millions of glassy purple, jellyfish-like sea creatures that look like sailboats have been washing ashore.
Known as "by-the-wind sailors," they typically live in the open ocean, but when warm water and storms draw them near shore, the wind blows them onto beaches, where they die in stinking piles.
These creatures, whose scientific name is Velella velella, aren't actually jellyfish, but hydrozoans, related to the Portuguese man-of-war.
Yet unlike man-of-war, they don't sting humans, though authorities don't recommend touching your face or eyes after handling them.

 Velella velella is known by the names sea raft, by-the-wind sailor

 or also purple sail, little sail, or simply Velella.

Each little sailboat, measuring about 2.75 inches (7 centimeters) long, is in fact a colony of hundreds of smaller organisms, each with a specialized function such as feeding or reproduction, researchers say.
"They sit at the surface of the ocean and have little sails," and their movement depends on which way the wind is blowing, said Richard Brodeur, a fishery biologist at NOAA Fisheries' Newport, Oregon, research station.


Most of the time off the coast of Oregon and California, the winds are blowing toward the South, into the open ocean, Peterson said.
But when big storms sweep out of the southwest — like one that hit California two weeks ago — it blows these living flotillas onto the beaches, he said.
There, they usually die, giving off a bad smell as they rot, he added.


Tons of the nautical creatures can be found at sea, but they don't always come ashore, Brodeur told Live Science. But recently, huge numbers of them have been washing up on land.
"This happens every few years, where they get blown onto the beaches," said Bill Peterson, an oceanographer also stationed at NOAA Fisheries' Newport lab. In 2009 or 2010, the beach had piles of the creatures 2-feet to 3-feet (60 to 90 cm) thick, and "it stunk like heaven," Peterson told Live Science.


Velella - Planktonic Vessels
from Parafilms

Colonies of polyps transported by prevailing winds, velella drift at the surface of warm seas.
Plankton Chronicles Project by Christian Sardet, CNRS / Noe Sardet and Sharif Mirshak, Parafilms

The animals can be found all over the world, but they mostly live in tropical or subtropical waters, Peterson said.
They like warm water, which has recently been pooling off the Oregon and California coasts, he said. When you get warm water combined with storms, that's when the creatures blow ashore.
Peterson said these beach invasions don't happen every year, but there's nothing unusual about the one this year.