Thursday, October 9, 2014

There's a chart for that

New York Harbor C.&G.S. 541

From Martha'sVineyard Mag by Remy Tumin

For two Island ferry captains, the end of paper nautical charts only makes them more precious.

Give Peter Wells a chart and he can go anywhere.
Forget a boat; all the Chappy Ferry captain needs is a nautical chart and he’s a world traveler.

The knickknacks, boats in the yard, and collectibles stacked around Wells’s Chappaquiddick home indicate this is someone who is intrigued by plenty of things, and for whom the imagination is easily accessible.
His charts are neatly stacked in large gray drawers, ready to pull out at a moment’s notice.
“The great thing about maps and charts is you can wander freely all over the earth,” he says.
“There’s no fence to stop you, no trespassing signs. It’s all information. And if you have information, you have access.”


Peter Wells, shown at the helm of the Chappy Ferry,
has collected nautical charts since he was in grade school

He has collected nautical charts since he was in sixth grade when he began working at Avery’s, a general store on Main Street in Edgartown that is now home to Sundog.
Charts were frequently updated to reflect changes in the location of buoys or obstructions, and old ones were taken out of circulation.


These changes were gold for a young Wells.
“When the new charts came out, I started taking some of the charts home because all we did was cut them up to make little memo pads,” he says.
“At home in the living room, I would lay out the charts of Long Island – there were six or eight of them, from New York to Cuttyhunk – and I’d lay them out. It was like you were up in a plane and you could see the world laid out at your feet.”

Wells had a flat trundle tray under his bed as a kid.
When the charts got wrinkled, he would take to the ironing board.
“My sisters would give me a lot of crap for that,” he laughs.
“Oh, Pete’s doing some ironing, take the curtains up there while he’s at it. I just wanted to flatten them out! It’s just a piece of paper, but look at all that stuff somebody’s drawn on there.”


Wells is shy to put a number to how many charts he’s amassed over the years.
In addition to his own collection, an uncle bequeathed him his collection just before he died.
Some of them are on display, but most are safely stashed away.
He pulls them out of their respective trays one by one like delicate sheets of tissue.
“If you go on the internet you can see this whole shoreline, but not in a big chunk like this,” he says.
“If you’re going to take a ship from the U.S. to Africa, you’d like to see both points on one chart.”

The chart in question is one he bought as part of a small spending spree after hearing the news last year that the federal government would no longer be publishing new paper charts, and would instead only offer them electronically through a print on-demand system.
“I just got this because it’s a shame they’re not going to be printing anymore,” he says.
“I was scared and it was an excuse to get it. Look at all the detail on this stuff. It’s a great thing.”

He also bought a chart of Balboa Island in California; a car ferry there is the model for the Chappy Ferry.
“I thought, well, I better get one of those because I’d like to go visit them someday,” Wells says.
“This way before you go there you can feel like you’ve already been there, you can look over the whole thing.”

And Lake Tahoe, another place he’d like to visit someday.
“There’s a ferry boat there, look at the depths – it’s four hundred feet deep,” he says, nearly breathless.
“Vineyard Sound only gets to one hundred feet deep.”

And Newfoundland: “Look at all the writing and little channels. There’s so much going on there and you can go there, just by having this in your lap.”

As it happens, Wells is not the only Vineyard ferry captain with a weakness for nautical charts. Captain David Dandridge of the Steamship Authority has been taking care of charts since the 1980s, when he worked on a research ship for Columbia University as second mate.
“That ship went all over the world, around and around. We had charts of the whole world onboard,” he says, rocking backward in his chair.
“In working with them I found there were all these charts, most of them published by the British Admiralty, that were using information and images from the nineteenth century. They were by far the most beautiful charts of all the ones we had.”


Captain David Dandridge of the Steamship Authority in his chart room.

As with most collectible items, Dandridge says finding a chart of interest can be challenging.
He’s dealt with old book dealers, poked around the antique shops, and traded some on and off over the years.
As a collector, he’s most interested in old charts from the nineteenth century.
But nonetheless, he sees the end of new paper charts* as a turning point.

“You can recognize it as an end of an era,” he says of the antique charts, which can run upwards of $1,000 today. “What the U.S. government did in terms of gathering data and turning it into a presentable utilitarian format was, in my mind, the pinnacle of government function.”

Preparing accurate charts of the coast began in 1807 when President Thomas Jefferson signed into effect “an act to provide for surveying the coasts of the United States.”
The new U.S. Office of Coast Survey was responsible for hydrographic surveys and producing nautical charts, mapping the entire coastline.
The Island’s own Henry Whiting was a topographer for the Survey between 1838 and 1897.
“The degree to which the coastal survey combined hydrographic and topographic information was without equal,” says Dandridge, and the charts from the late nineteenth century were “without comparison.”


It was slow, expensive, methodical work that only began with taking measurements and soundings. For instance, it took close to twenty years to gather the data and complete an 1870 chart of Block Island Sound in his collection.
“Charts had to be engraved on copper plates,” he says.
“Somebody had to draw the chart and that had to be transferred reversed onto a copper plate. Then a man had to cut out each little speck to create the copper plate form so the printing could be done.”

Dandridge has one chart that was once housed in the offices of the Survey itself in Washington, D.C. On the bottom of the chart is a handwritten note that says: “the engraving of this chart I was told cost $100 a square inch.”

Dandridge stores many of his charts, but keeps a few others on display throughout his Lagoon Pond home.
The stairway tells a story of oceans near and far.
From storage he brings out a large chart of Portugal.
The detailed lines hang from one end of the paper to the other like a rigging of a ship.
It is a nineteenth century chart with depths and coves labeled in perfect script.
“It’s representative of the end of the style of private printing,” he says.
“There’s different presentation of the lines and multiple compass roses, a more elaborate legend and a great many ports along that shore.”
“Why did we get away from this?” he asks.
“Isn’t that elegant?”

* Note : Reader Feedback
I'm sorry Capt. Wells was under the impression that NOAA is ending paper charts. We are not. The difference is that NOAA-certified companies are printing them instead of the federal government. The Office of Coast Survey still maintains and updates the full suite of over 1,000 paper charts (in digital format for printing or viewing). You can see them all -- and find a NOAA-certified paper chart distributor -- at nauticalcharts.noaa.gov -

Dawn Forsythe, NOAA Office of Coast Survey , Silver Spring

Links :

Wednesday, October 8, 2014

Beyond the Nobel: What scientists are learning about how your brain navigates

Edvard and May-Britt Moser's discoveries - in particular the "grid
cells" - which the magazine Science described as the most important finding
in the field for two decades - are quite remarkable.
They have shown how the brain calculates the position of the organism in its spatial environment, completely overturning prior conventional thinking in the field.

From BBC by James Gallagher

The Nobel Prize for physiology or medicine has been awarded to three scientists who discovered the brain's "GPS system".

UK-based researcher Prof John O'Keefe as well as May-Britt Moser and Edvard Moser share the award.
They discovered how the brain knows where we are and is able to navigate from one place to another.
Their findings may help explain why Alzheimer's disease patients cannot recognise their surroundings.
"The discoveries have solved a problem that has occupied philosophers and scientists for centuries," the Nobel Assembly said.



Place cells, discovered by John O’Keefe, reside in the brain’s hippocampus and become active when a rat is in a certain spot. In the nearby entorhinal cortex, grid cells, discovered by May-Britt Moser and Edvard Moser, fire at regularly spaced intervals as an animal moves through space, forming a hexagonal pattern. (see illustration)

Inner GPS

Prof O'Keefe, from University College London, discovered the first part of the brain's internal positioning system in 1971.
On hearing about winning the prize, he said: "I'm totally delighted and thrilled, I'm still in a state of shock, it's the highest accolade you can get."

His work showed that a set of nerve cells became activated whenever a rat was in one location in a room.
A different set of cells were active when the rat was in a different area.
Prof O'Keefe argued these "place cells" - located in the hippocampus - formed a map within the brain.
He will be having a "quiet celebration" this evening and says the prize money "should be used for the common good".

Mapping

In 2005, husband and wife team, May-Britt and Edvard, discovered a different part of the brain which acts more like a nautical chart.
These "grid cells" are akin to lines of longitude and latitude, helping the brain to judge distance and navigate.

They work at the Norwegian University of Science and Technology in Trondheim.
Prof May-Britt Moser said: "This is crazy, this is such a great honour for all of us and all the people who have worked with us and supported us."
The Nobel committee said the combination of grid and place cells "constitutes a comprehensive positioning system, an inner GPS, in the brain".

They added: "[This system is] affected in several brain disorders, including dementia and Alzheimer's disease.
"A better understanding of neural mechanisms underlying spatial memory is therefore important and the discoveries of place and grid cells have been a major leap forward to advance this endeavour."

'Cognitive revolution'

Dr Colin Lever, from the University of Durham, worked in Prof O'Keefe's laboratory for ten years and has already dreamt on two occasions that his former mentor had won the award.

He told the BBC: "He absolutely deserves the Nobel Prize, he created a cognitive revolution, his research was really forward thinking in suggesting animals create representations of the external world inside their brains."
"Place cells help us map our way around the world, but in humans at least they form part of the spatiotemporal scaffold in our brains that supports our autobiographical memory.
"The world was not ready for his original report of place cells in 1971, people didn't believe that 'place' was what best characterised these cells, so there was no great fanfare at that time.
"But his work on hippocampal spatial mapping created the background for discovering grid cells and with grid cells, the world was prepared and we all thought wow this is big news."

Links :
  • Wired : Beyond the Nobel: What Scientists Are Learning About How Your Brain Navigates
  • NYTimes : Nobel Prize in Medicine Is Awarded to Three Who Discovered Brain’s ‘Inner GPS’
  • NYTimes : Is GPS All in Our Heads?
  • BostonGlobe : Do our brains pay a price for GPS?
  • NPR : The GPS in your head may work a lot better than that phone

Tuesday, October 7, 2014

Different depths reveal ocean warming trends

 Inaccurate temperature readings of Southern Hemisphere oceans have led to global warming being underestimated.
The team studied rising temperatures of the southern hemisphere over the decades between 1970 and 2004, and recommended increasing estimates of the rate of ocean warming by between 48% and 152%.

From BBC by Jonathan Webb

The deeper half of the ocean did not get measurably warmer in the last decade, but surface layers have been warming faster than we thought since the 1970s, two new studies suggest.

Because the sea absorbs 90% of the heat caused by human activity, its warmth is a central concern in climate science.
The new work suggests that shallow layers bear the brunt of ocean warming.
Scientists compared temperature data, satellite measurements of sea level, and results from climate models.
Both the papers appear in the journal Nature Climate Change.

The Antarctic Ocean is a remote place where icebergs frequently drift off the Antarctic coast and can be seen during their various stages of melting.
This iceberg, sighted off the Amery Ice Shelf, also has bands of translucent blue ice formed by sea or freshwater freezing in bands between layers of more compressed and white glacial ice.
Image by Andrew Meijers/BAS

Underestimation
 
Specifically in the Southern Hemisphere where fewer measurements have been made, a team of researchers from the Lawrence Livermore National Laboratory in California investigated long-term warming in the top 700m of the ocean.

They wanted to compare published warming rates, based on the sparse temperature data recorded directly from southern waters, with what could be predicted based on more detailed observations in the north, together with climate models and precise sea-level measurements.

Sea levels across the planet are accurately assessed by satellites, which bounce radio waves off the ocean surface.
And sea level changes are closely related to ocean temperature, because the water expands as it warms up.

By combining these calculations, the scientists found that the rate of upper-ocean warming between 1970 and 2004 had been seriously underestimated.
That inaccuracy is specific to the Southern Hemisphere, but is big enough, the scientists suggest, that global upper-ocean warming rates are also "biased low" - to the tune of 24% to 55%.
The researchers say the underestimation probably arose simply from the scarcity of measurements in the south.
"It's likely that due to the poor observational coverage, we just haven't been able to say definitively what the long-term rate of Southern Hemisphere ocean warming has been," said lead author Dr Paul Durack.
"It's a really pressing problem - we're trying as hard as we can, as scientists, to provide the best information from the limited observations we have."

Dr Jan Zika, an oceanographer at the University of Southampton, agreed that Dr Durack's work highlighted the need for more data.
"It could be that the heat uptake by the ocean is a stronger contribution than we previously thought," he told BBC News.
Storage of heat in the oceans is the best explanation scientists have for the recent "'slowdown'" in the rise of global surface temperatures.
Dr Zika added that the heat content of shallow layers is a particular concern, as that warmth is more likely to return to the atmosphere.
"If it were getting really deep down, then we might think that it's basically stuck there," he said.

Obscure depths
 
Meanwhile, at depths greater than 2km, temperatures appear relatively stable - at least as far as changes can be detected.
That was the outcome of the second study, in which a team from the California Institute of Technology made thorough use of the vastly improved data coverage that has been delivered by the Argo programme of remote, floating probes.

 Akin to having a fleet of miniature research vessels, the global flotilla of more than 3,600 robotic profiling floats provides crucial information on upper layers of the world's ocean currents.
Photo by Alicia Navidad/CSIRO.

These devices started to be deployed in 1999 and there are now more than 3,600 of them adrift in our planet's oceans.
Argo "floats" only record temperatures down to about 2km beneath the surface, so the Caltech researchers used that information to calculate the overall amount of heat absorbed by the upper 2km of the oceans (approximately the top half).
Then, by subtracting that quantity of heat from the total ocean warming indicated by satellite observations of sea level, they estimated how much the deeper half of the ocean (below 2km) had warmed up.
The result: once the high level of uncertainty associated with the calculations was taken into account, there was no change detected in the deep.
"Combining those different observations, we ended up with a large uncertainty in our estimate," explained Dr William Llovel, the study's lead author.
"But on the other hand, it is a global estimate. We're not using just a few observations from the deep ocean itself."

 Global mean sea-level variations :
The estimates are observed variations by satellite altimetry (blue), ocean mass contributions based on GRACE data (solid black) and steric sea level based on in situ observations (red).

In a commentary for Nature Climate Change, Dr Gregory Johnson and Dr John Lyman, both from the National Oceanic and Atmospheric Administration in Seattle, US, said the results pointed to a crucial gap in ocean measurements.
They suggested that clearer conclusions would come from the next generation of floating probes, known as Deep Argo.
The first such device was launched in 2013 and plunged 6km beneath the waves off Puerto Rico; two other prototypes were deployed off the New Zealand coast in June 2014.
"It is time to close the deep-ocean measurement gap and reduce the uncertainties in global planetary energy and sea-level budgets," wrote Dr Johnson and Dr Lyman.

Dr Zika agrees. "There are very clear, very plausible explanations for how the ocean could be taking up heat and offsetting global warming," he told the BBC.
"But to attribute exactly where that heat's going, and whether it'll pop back out or not, is going to take more observations. We need to get those in place."

Adapting to a Changing Ocean: A Global Society Perspective
David Victor is a professor of international relations and director of the Laboratory on International Law and Regulation at UC San Diego.
His research focuses on highly regulated industries and how regulation affects the operation of major energy markets.
He is the author of Global Warming Gridlock, which explains why the world hasn’t made much diplomatic progress on the problem of climate change and the search for new strategies.

Links :

Monday, October 6, 2014

NZ Linz update in the Marine GeoGarage

Coverage NZ Linz Marine GeoGarage layer

As our public viewer is not yet available
(currently under construction, upgrading to Google Maps API v3 as v2 is officially no more supported),
this info is primarily intended to
our iPhone/iPad universal mobile application users
(Marine NZ on the App Store) 
and our B2B customers which use our nautical charts layers
in their own webmapping applications through our GeoGarage API.  



5 charts has been updated in the Marine GeoGarage
(Linz September update published October 3rd, 2014 (Updated to NTM Edition 19)

  • NZ541 Mayor Island to Okurei Point
  • NZ542 Motiti Island to Pehitari Point
  • NZ5113 Plans in Rangaunu Bay
  • NZ5124 Plans in the Bay of Islands
  • NZ5413 Approaches to Tauranga
Today NZ Linz charts (183 charts / 323 including sub-charts) are displayed in the Marine GeoGarage.

Note :  LINZ produces official nautical charts to aid safe navigation in New Zealand waters and certain areas of Antarctica and the South-West Pacific.


Using charts safely involves keeping them up-to-date using Notices to Mariners
Reporting a Hazard to Navigation - H Note :
Mariners are requested to advise the New Zealand Hydrographic Authority at LINZ of the discovery of new or suspected dangers to navigation, or shortcomings in charts or publications.

US Navy to deploy armed, robotic patrol boats


From The Telegraph

Technology adapted from Nasa's rovers on Mars could transform how the American navy operates, officials say

The US Navy says it will soon use armed, robotic patrol boats with no sailors on board to escort and defend warships moving through sensitive sea lanes.
The technology, adapted from Nasa's rovers on Mars, will transform how the American navy operates, and is sure to raise fresh questions and concerns about the widening role of robots in warfare.

  During the demonstration as many as 13 Navy boats, using an ONR-sponsored system operated autonomously or by remote control during escort, intercept and engage scenarios.

The Office of Naval Research on Sunday released the results of what it called an unprecedented demonstration in August involving 13 robotic patrol craft escorting a ship along the James River in Virginia.
In a simulated scenario, five of the robotic patrol boats guarded a larger ship, while eight others were ordered to investigate a suspicious vessel.
The unmanned patrol boats then encircled and swarmed the "target," enabling the mother ship to move safely through the area.

 This Tuesday Aug. 12, 2014 photo provided by the U.S. Navy shows an unmanned 11-meter rigid hulled inflatable boat (RHIB) from Naval Surface Warfare Center Carderock, as it operates autonomously during an Office of Naval Research demonstration of swarmboat technology held on the James River in Newport News, Va
(AP Photo/U.S. Navy, John F. Williams)

The demonstration, conducted over two weeks, was designed to "replicate a transit through a strait," naval research chief Rear Admiral Matthew Klunder told reporters in a recent briefing.
"It could be the straits of Malacca, it could be the straits of Hormuz."
The demonstration was a "breakthrough" that goes far beyond any previous experiment, he said, adding that similar robotic patrol craft likely will be escorting US naval ships within a year.
The patrol craft, 11-yard long vessels known in the military as rigid hulled inflatable boats, are usually operated by three or four sailors.
But outfitted with the robotic system, a single sailor could oversee up to 20 of the vessels.

The inflatable boat operates autonomously
during an Office of Naval Research demonstration of swarmboat technology

There were no shots fired in the demonstration but Rear-Adml Klunder said the robotic craft can be outfitted with non-lethal equipment, such as lights and blaring sound, as well as 50-caliber machine guns.
And the vessels could fire on an enemy ship if ordered to do so by a sailor.
"We have every intention to use those unmanned systems to engage a threat," the admiral said.
"There is always a human in the loop of that designation of the target and if so, the destruction of the target."


For the demonstration, researchers had fail-safe systems in place to avoid any mishaps.
If communications with the patrol craft broke off, the vessels would go "dead in the water," said programme manager Robert Brizzolara.
And if the boats malfunctioned in some way, there were two separate communications links that could be used to halt the vessel.
Unlike drone aircraft, such as the famed Predator and Reaper planes, the robotic boats are more autonomous and can carry out directions without having to be operated by a human at every step.
"The excitement about this technology is it is autonomous," Rear-Adml Klunder said.
"So we're not talking about people having to drive with toggle switches."


The boats move in sync with other unmanned vessels, selecting the best route while sensing obstacles.
The US military sees the innovation as saving sailors' lives and strengthening the navy's edge.
But sceptics have warned of the dangers from the spread of armed robots – without sufficient rules and debate about their use.
The technology, which the navy has dubbed CARACaS, or Control Architecture for Robotic Agent Command and Sensing, is "very low-cost" and can be installed easily on the patrol boats or other ships, Rear-Adml Klunder said.

Eight unmanned high-speed maneuvering surface targets, at right, lead the way as five unmanned surface vehicles escort the Relentless.

"We're talking thousands [of dollars]. We're not talking millions to adapt what we already have – existing craft in our fleet," he added.
"So we're not going out and buying new patrol craft."
Evoking images from science fiction with fleets of robots waging war, Rear-Adml Klunder said the system could eventually be installed on larger naval ships.
And the robotic patrol craft could be used to transport teams of special operation forces, which already use the manned version of the boats.


Other government agencies and private firms are also taking a keen look at the unmanned boats.
"We're putting it out there to save sailors and marines' lives, to protect ships, to protect harbors and ports," Rear-Adml Klunder said.
The military unveiled the technology around the 14th anniversary of the attack on the USS Cole off the coast of Yemen.
The October 2000 attack, in which a small boat with explosives detonated near the US destroyer, killed 17 sailors and wounded 39 others.
"If we had this capability on that day, I'm sure we would have saved that ship," Rear-Adm Klunder said.

Links :