Missing plane: Searching from space may help

01:31, Mar 14 2014
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Journalists attempt to interview a woman who is the relative of a passenger on Malaysia Airlines flight MH370, as she crouches on the floor crying, at the Beijing Capital International Airport.
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A relative of a passenger onboard Malaysia Airlines flight MH370 cries, surrounded by journalists, at the Beijing Capital International Airport on March 8, 2014.
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The Malaysia Airlines flight carrying 227 passengers and 12 crew lost contact with air traffic controllers early on Saturday en route from Kuala Lumpur to Beijing, the airline said in a statement.
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An aerial view of an oil spill is seen from a Vietnamese Air Force aircraft in the search area for a missing Malaysia Airlines plane, 250 km from Vietnam and 190 km from Malaysia, in this handout photo from Thanh Nien Newpaper taken on March 8.
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A spokesman (centre) of Malaysia Airlines is surrounded by journalists as he gives a briefing about Malaysia Airlines flight MH370, at a hotel in Beijing March 8, 2014.
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A relative (front) of a passenger of Malaysia Airlines flight MH370 cries as she walks past journalists at a hotel in Beijing March 9, 2014. The Malaysia Airlines Boeing 777-200ER aircraft carrying 227 passengers and 12 crew was presumed to have crashed off the Vietnamese coast on Saturday.
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Malaysia Airlines Commercial Director Hugh Dunleavy (centre) speaks to journalists about information of Malaysia Airlines flight MH370.
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Vietnamese Air Force officers sit in the cockpit of a search and rescue aircraft as they fly over the search area for a missing Malaysia Airlines plane.
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Volunteer rescue workers and religious organisations pray during multi-religion mass prayers for the passengers of Malaysian Airlines flight MH370, at the Kuala Lumpur International Airport in Sepang.
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A view of oil slicks (pale line near the bottom right) spotted in an area of the South China Sea about 100 nautical miles (185 km) from Tok Bali Beach in Malaysia's Kelantan state.
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Admiral Datuk Mohd Amdan Kurish, Director General of the Malaysian Maritime Enforcement Agency, looks at a radar screen while searching for a missing Malaysia Airlines plane in the South China Sea.
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A relative (left) of a passenger of Malaysia Airlines flight MH370 is escorted by a caregiver from Malaysia Airlines as they walk in a corridor at a hotel in Beijing.
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Indian sand artist Sudarshan Patnaik applies the final touches to a sand art sculpture he created wishing for the well being of the passengers of Malaysian Airlines flight MH370, on a beach in Puri, in the eastern Indian state of Odisha.
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Life vests and lifesavers are seen onboard a Vietnam Air Force search and rescue aircraft on a mission to find the missing Malaysia Airlines flight MH370, off Tho Chu island.
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Journalists place their recorders as they get ready for the first briefing of the day at a news conference at the Kuala Lumpur International Airport in Sepang on March 10.
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Relatives of a passenger onboard the missing Malaysia Airlines flight MH370 cry inside a hotel they are staying, in Putrajaya. China has urged Malaysia to step up the search for the jetliner that went missing with 239 people on board, about two-thirds of them Chinese, and said it has sent security agents to help with an investigation into the misuse of passports.
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An officer looks out of a helicopter during a mission to find the Malaysia Airlines flight MH370 that disappeared from radar screens in the early hours of Saturday, near Tho Chu Island.
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A map of a flight plan is seen on a computer screen during a meeting before a mission to find the Malaysia Airlines flight MH370 that disappeared from radar screens in the early hours of Saturday, at Phu Quoc Airport.
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A woman stands in front of a giant screen showing the number hours since Malaysia Airlines flight MH370 went missing, in Beijing on March 10.
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A family member of a passenger from the missing Malaysia Airlines flight MH370 waits for news at Lido Hotel on March 10, in Beijing, China. Investigative teams continue to search for the missing Malaysia Airlines flight MH370 and the 293 passengers that were travelling from Kuala Lumpur to Beijing.
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Dato' Azharuddin Abdul Rahman, director general of the Malaysian Department of Civil Aviation briefs the media over latest updates on missing Malaysia Airline MH370 on March 10, in Kuala Lumpur.
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Clouds hover outside the window of a Vietnam Air Force search and rescue aircraft An-26 on a mission to find the missing Malaysia Airlines flight MH370, off Vietnam's Tho Chu island.
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People believed to be relatives of passengers of the missing Malaysia Airlines flight MH370 are escorted to the VIP section of the Beijing Capital International Airport prior to flying to Kuala Lumpur.
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A Chinese relative of a passenger of Malaysia Airlines MH370 is comforted by a staff member of the airport as she shields her face from journalists at Kuala Lumpur International Airport.
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A combination photo shows two men whom police said were travelling on stolen passports onboard the missing Malaysia Airlines MH370 plane.
Military personnel look out of a Singapore Air Force plane during the search
Military personnel look out of a Singapore Air Force plane during the search.
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Malaysia's police chief, Inspector General Khalid Abu Bakar, addresses a news conference.
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Students from an international school in east China city Zhuji pray for the passengers onboard Malaysia Airlines flight MH370.
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LOOKING FOR ANSWERS: Family members of missing passengers leave a meeting in a Beijing Hotel.
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MESSAGE OF HOPE: A Vietnamese tourist writes a message of hope for missing passengers and crew.
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MESSAGES FOR THE MISSING: Tying a message of hope on a message board for passengers and crew.
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A relative of a passenger aboard Malaysia Airlines flight MH370 answers media questions at Lido Hotel.
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A charity worker comforts an emotional relative of a passenger.
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Indian sand artist Sudarshan Pattnaik works on a sand sculpture of missing Malaysia Airlines flight MH370, at golden beach at Puri in the eastern Indian state of Odisha.
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Satellite images reveal a possible crash site for the missing Malaysia Airlines plane, where three large objects were seen in the water.
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An object sits in the water in satellite imagery released by China.
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The zone where the mystery objects were found.
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What appears to be fuel sits on the water in the area where three large objects were found.
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A crew member from the Royal Malaysian Air Force looks through the window of a Malaysian Air Force CN235 aircraft during a Search and Rescue operation to find the missing Malaysia Airlines flight MH370.
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The Arleigh Burke-class guided-missile destroyers USS Kidd and USS Pinckney are seen en transit in the Pacific Ocean in this US Navy picture taken May 18, 2011. Kidd and Pinkney have been searching for the missing Malaysian airliner and are being re-deployed to the Strait of Malacca off Malaysia's west coast as new search areas are opened in the Indian Ocean.
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Students watch as a group of artists put the finishing touches to a three dimensional artwork at a school in Makati city, metro Manila. According to the artists, the artwork is their way of expressing sympathy towards the relatives of passengers onboard the missing Boeing 777-200ER.
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Malaysia's acting Transport Minister Hishammuddin Hussein shows two maps with corridors of the last known possible location of the missing plane.
Selamat Omar shows a picture of his son, flight engineer Mohd Khairul Amri Selamat
Selamat Omar shows a picture of his son, flight engineer Mohd Khairul Amri Selamat who was onboard the missing Malaysia Airlines Flight MH370.
Chinese relatives of the missing passengers
Chinese relatives of the missing passengers who were travelling onboard Malaysia Airlines flight MH370 watch a television displaying a Malaysian press conference at Lido Hotel in Beijing.
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A family member of a passenger onboard the missing Malaysia Airlines flight MH370 cries as he watches a message board dedicated to passengers.
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Satellite photos from March 20 show the objects "possibly associated" with the search for the missing plane. The images were released hours after Australia announced it had "credible" leads in the search for flight MH370.
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Satellite photos from March 20 show the objects "possibly associated" with the search for the missing plane. The images were released hours after Australia announced it had "credible" leads in the search for flight MH370.
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A still image taken from video shows an image of an object spotted in the southern Indian Ocean by the Gaofen-1 high-resolution optical Earth observation satellite of CNSA.
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Pilot Dave Smith (R) gives a pre-flight briefing aboard a Royal New Zealand Air Force P-3K2 Orion aircraft before taking off to search for missing Malaysian Airlines flight MH370, at RAAF base Pearce near Perth, March 22, 2014.
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Family members of passengers onboard Malaysia Airlines Flight MH370 raise their fists as they shout "return our families" to protest against the lack of new information after a routine briefing given by Malaysia's government and military representatives at Lido Hotel in Beijing March 22, 2014.
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Malaysia's acting Transport Minister Hishammuddin Hussein holds up a note that he has just received on a new lead in the search for the missing Malaysia Airlines Flight MH370, during a news conference at Kuala Lumpur International Airport March 22, 2014.
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Malaysia's Prime Minister Najib Razak (bottom C) takes part in a special prayer for passengers onboard the missing Malaysia Airlines Flight MH370 at the Tuanku Mizan Zainal Abidin mosque in Putrajaya March 21, 2014.
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A woman writes on a banner of well wishes for the passengers of the missing Malaysia Airlines Flight MH370 at Kuala Lumpur International Airport March 14, 2014.
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A family member of a passenger onboard Malaysia Airlines Flight MH370 covers her face as she cries after a routine briefing given by Malaysia Airlines at Lido Hotel in Beijing, March 22, 2014.
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A girl reads some of the messages of hope and support for the passengers of the missing Malaysia Airlines MH370 at a mall outside Kuala Lumpur March 22, 2014.
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A crew member aboard a Royal Australian Air Force (RAAF) AP-3C Orion uses binoculars as it flies over the southern Indian Ocean during the search for missing Malaysian Airlines flight MH370 March 22, 2014.
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A woman writes another message of hope and support for the passengers of the missing Malaysia Airlines MH370 at a mall outside Kuala Lumpur March 22, 2014.
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Map of the southern Indian Ocean locating site where a satellite may have found debris related to Malaysia Airlines Flight 370; includes satellite images of possible debris. MCT
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Solid matter is pictured floating in the southern Indian Ocean seen from a Royal New Zealand Air Force P-3K2 Orion aircraft searching for missing Malaysian Airlines flight MH370.
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INDIAN OCEAN - This handout Satellite image made available by the AMSA (Australian Maritime Safety Authority) shows a map of the planned search area for missing Malaysian Airlines Flight MH370 on March 24, 2014.
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Malaysia's acting Transport Minister Hishammuddin Hussein holds satellite images as he speaks about the search for the missing Malaysia Airlines flight MH370 on March 26.
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A satellite photo, showing the locations and co-ordinates of unknown objects reported by the Malaysian Remote Sensing Agency (MRSA) in the Indian Ocean. The images were taken on March 23 and released on March 26.
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A satellite photo, showing the location of unknown objects reported by the Malaysian Remote Sensing Agency (MRSA) in the Indian Ocean. The images were taken on March 23 and released on March 26.

High-definition satellite imagery would seem to be an ideal tool to use in the multinational hunt for a passenger jet that simply vanished nearly a week ago with hundreds of people on board.

Satellites can deliver incredibly detailed images of large swathes of open ocean that can then be scanned on a computer screen for any potential wreckage, seemingly delivering a technological advantage in the hunt for missing Malaysia Airlines flight MH370.

But does searching from space really work?

Hopes of a breakthrough in the investigation were raised briefly this week, when a Chinese government agency released three grainy satellite images it said showed unidentified "floating objects" in the "suspected crash area" of the Boeing 777, which disappeared with 239 people, including six Australians and two New Zealanders, on board.

The pictures, taken by the Gaofen-1 satellite, showed what appeared to be three large floating objects in the South China Sea, about 226 kilometres from the last recorded transponder signal in the waters north-east of Kuala Lumpur and south of Vietnam.

But Malaysian authorities later discounted the theory that the items were remnants of the aircraft.

Malaysia's civil aviation chief, Datuk Azharuddin Abdul Rahman, said surveillance aircraft examined the area identified by the satellite images on Thursday.

"There is nothing. We went there, there is nothing," he said.

Associate Professor Linlin Ge, from the University of NSW's School of Civil and Environmental Engineering, believes that satellite remote sensing can deliver many advantages over traditional air and sea searches using ships and aircraft.

In an article on The Conversation website, published before the Chinese satellite images were discounted, Dr Ge said metallic structures such as the wreckage of a plane could be easily visible on radar images, while satellite imaging radar could also "see" through any cloud and take images day and night.

He said satellites orbited  the earth at a height of between 200 and 900 kilometres, and could cover a large area, between 100,000 and 250,000 square kilometres, with a single image collected in only a few seconds.

"It would take an aircraft between 1.5 and 34 hours to cover the same area. A ship will take much longer," he wrote.

"Another advantage of satellites is that, once in orbit, the cameras and radar sensors on board are always on standby. They can be switched on immediately, as soon as the space agencies are informed of an accident, and can be pointed straight at the area around the last known co-ordinates of the aircraft.

"This also makes them much quicker to respond to incidents such as an air crash than the air and sea search vessels."

Dr Ge said there were some limitations, such as if a plane crashed on land and the wreckage was obscured by dense tropical forest.

But in response to the article, Geoffrey Dell, an associate professor in accident investigation and forensics at Central Queensland University, said that "if something sounds too good to be true, it probably is".

"It'll be a while yet before the watershed moment when digital imagery will fully supplant the tedious, hard yards of physical searching, which has been the hallmark of SAR [search-and-rescue] activities for the past 50 years or more," he wrote on The Conversation.

"While the notion of being able to examine hundreds of thousands of square kilometres of ocean, in short order, seems like it'd be just what the doctor ordered, I think the real challenges associated with the practical application of the technology might yet be just beyond our present capability."

Associate Professor Dell said complex algorithms were needed to synthesise areas of interest from digital imagery and, without this, people would need to visually examine all of the images, which would take a long time.

"However, the crowdsourcing of hundreds of thousands of volunteers might make a valuable contribution with the use of effective and reliable algorithms to consolidate consensus tagging of areas of interest," he wrote.

"Albeit, even then, if an area of interest is identified, someone will have to fly out there and take a look. Doubtless it will still [take] significant effort and be a difficult and time-consuming process."

A timeline of events in the disappearance of a Malaysia Airlines jetliner which vanished from radar screens on a flight from Kuala Lumpur to Beijing on Saturday.

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