The world-famous Stonehenge has been laser scanned in unprecedented detail, revealing 71 carvings of Bronze Age axes not seen in more than three thousand years.
The task of further examining this ancient structure, to discover more about it, was awarded to ArcHeritage, part of the York Archaeological Trust in the United Kingdom, as part of a project commissioned by English Heritage.
The laser scan used point spacing of 0.5 millimetres, and resulted in an enormous data resource of 850 gigabytes. Preliminary examination of the meshed models identified individual tool marks over 5,000 years old, but it was evident that the data contained more prehistoric artwork carved onto the surface of the stones.
The team decided to visualise the original point-cloud data and created a workflow using Bentley Pointools. The use of Bentley Pointools on this project enabled large datasets to be loaded, facilitating an examination of the full resolution data. The software’s shading function was instrumental in visualising the most subtle features, which resulted in the discovery of the subtle, Bronze Age carvings.
“We needed a software solution that would handle and visualise vast quantities of survey data,” said Marcus Abbott, a member of the ArcHeritage geomatics and visualisation team. “Bentley Pointools is capable of loading both 3D mesh and point-cloud data. The discovery of unrecorded prehistoric rock art on the stones was first realised in Bentley Pointools.”
Richard Zambuni, Bentley global marketing director, geospatial and utilities, said, “Stonehenge is one of the world’s great buildings surviving from prehistory – it is not fanciful to call this amazing public building ‘infrastructure,’ and although we know very little about how this structure was designed, constructed, and used, cutting-edge infrastructure software such as Bentley Pointools can be used to give us more insight into this astonishing edifice.
“The layering and shading functions in Bentley Pointools allowed carvings of Bronze Age axe heads and daggers that were invisible to the naked eye to be visualised, and provided sub-millimetre accuracy to the archaeologists documenting Europe’s greatest Stone Age building. It is truly gratifying to see Bentley Pointools used on such an exciting undertaking.”
The discovery of the carvings at Stonehenge was realised through the team’s use of Bentley Pointools’ Plane Shading function to create a greyscale band 7.5 centimetres wide. This band was moved at 1-millimeter intervals through the data. As it moved, it created a high-quality rendering of the plane shaded image. The team repeated the process 75 times to complete a full colour-change for every point in the data. Depending on the position in relation to a pre-set camera plane, each point was assigned a greyscale value, allowing very subtle features to be visible. When the images were combined into an animation and played back, the carvings, which were invisible to the naked eye, were seen fading in and out.
It was only through Bentley Pointools’ powerful visualisation capabilities that this eroded prehistoric artwork was discovered. Once the extent of the carvings was identified, the team deployed the measuring and point location tools to accurately plot the carvings to the Ordnance Survey grid.
A case study on the ArcHeritage Stonehenge project is available from Bentley here [PDF link].
Article by : http://www.spatialsource.com.au/
Stonehenge Tour Guide
Monday, 18 February 2013
Friday, 1 February 2013
Heritage Centenary 2013
This year, 2013, is the centenary of a landmark moment for England’s heritage.
The Ancient Monuments Consolidation and Amendments Act of 1913 recognised for the first time that there are physical remains of the nation’s history which are so special that the state has a duty to protect them.
English Heritage’s origins stretch back to this Act which effectively established the National Heritage Collection and created many of the powers used to safeguard the country’s unique legacy of historic buildings, monuments and landscapes. In this part of our website, you can find out more about the Act and how we are celebrating its anniversary.
The 1913 Ancient Monuments Act
This year, 2013, is the centenary of a landmark moment for England’s heritage. The passing of the Ancient Monuments Consolidation and Amendment Act in 1913 recognised for the first time that there are physical remains of the nation’s history which are so special and so significant that the state has a duty to ensure their continued survival.
There were fears that the castle would either be demolished for the value of its materials or dismantled brick-by-brick, transported across the Atlantic, and re-erected on American soil. An attempt by the Office of Works to gain control of the Castle came to nothing and the National Trust turned down the chance to buy it.
At the eleventh hour, Lord Curzon, the former Viceroy of India and restorer of the Taj Mahal, stepped in and made an offer to buy the Castle and land around it, which the Americans accepted. Using his connections he had the ports watched so that the fireplaces could not be smuggled out of the country. After a tip-off, they were found in a mews in London. Draped in Union Jacks, they were mounted on horse-drawn carriages, and triumphantly returned to the castle in 1912
The dramatic rescue of Tattershall was taken as the prime example of the need for action when in 1912 Parliament was preparing to strengthen protection for historic buildings and monuments. Speaking in the House of Lords on 30 April 1912, Lord Curzon declared:
"The whole attitude of this country and of the civilized world in general has changed towards archaeology in recent years. We regard the national monuments to which this Bill refers as part of the heritage and history of the nation…they are documents just as valuable in reading the record of the past as any monument or parchment deed…there is the case of Tattershall Castle in Lincolnshire…In these cases the government in the existing condition of affairs is absolutely helpless. All it can do is to sit still and look on while these acts happen; the only power it possesses being the limited and almost futile prerogative given it by the legislation of 1882 and 1900."
Earlier Heritage Legislation
There were two Ancient Monuments Acts before the 1913 Act. The first in 1882 included a list of 68 prehistoric monuments in Great Britain and Ireland that, with the consent of their owners, would eventually be brought into the nation’s care.
The Act also provided for the appointment of one or more Inspector of Ancient Monuments to oversee and provide advice upon the protection of monuments. An editorial published in The Times in 1882 noted that the Act in its current form would be of limited interest to the wider public: ‘England will not go mad yet on clay funerary urns, flint heads and scrapers.’
By the end of the following year Pitt-Rivers had obtained 14 more monuments. However by the late 1880s progress had significantly slowed. As the process was voluntary, Pitt-Rivers had to stand aside whilst monuments were destroyed. Among these were prehistoric cup-marked stones at Ilkley, Yorkshire, carted off ‘probably to some rockery’.
Despite its shortcomings, the first Ancient Monuments Act did set a precedent. By the turn of the century several groups were campaigning for revised legislation. Among these were the Society for the Protection of Ancient Buildings and the recently founded National Trust (1895).
The Ancient Monuments Act of 1900 resulted in a major transfer to the Office, later the Ministry, of Works (English Heritage, Historic Scotland and Cadw are the Office’s direct successors) of historic buildings and monuments in the care of other Government departments. Nonetheless there were still no compulsive measures to protect the physical remains of the nation’s history.
The 1913 Ancient Monuments Act or – to give the Act its full title – the 1913 Ancient Monuments Consolidation and Amendment Act changed all that. Given Royal Assent on the 15th August 1913, the Act repealed everything so far established and started again – its provisions essentially governed protection of ancient monuments until 1979.
Each order would need an Act of Parliament to confirm it, making it an unwieldy instrument, but the Act did at least establish the principle that some buildings in private ownership might, if they were important enough, warrant the intervention of the state to save them.
The second major innovation was the ‘scheduling’ of monuments. This involved compiling a list, or schedule, of monuments which were deemed by an expert board to be of ‘national importance’. Once a site was on the list and the owner informed, it became a crime to damage it.
Under the Act, the Office of Works could give free advice to an owner regarding the treatment of an ancient monument on their land and could oversee any works free of charge. Scheduling considerably widened the scope of protection to the thousands of monuments on private land rather than just those in Government or local authority care.
These two initiatives – the preservation order and scheduling – established the statutory protection of those parts of the nation’s heritage in private hands. It would develop in future years through the listing system and a rapidly evolving planning system.
Four historic sites were acquired under the new Act that year:
In 1912, the Education Minister Charles Trevelyan argued that the bill was not simply an antiquarian issue ‘but that it should be realised that part of the character of the nation which depends upon the appreciation of the past may really be affected by the preservation of these monuments…the nation ought to learn about its past through what is left of its monuments’. Museums, he said were important, but ‘a thing in a museum does not strike the imagination of a young person nearly as vividly as a building.’
Since 1913, the National Heritage Collection has grown considerably and is today Europe’s most ambitious outdoor museum, consisting of 880 historic monuments and properties. English Heritage looks after 413 sites as well as their contents and archives, ranging from prehistoric stone circles to a 1960s nuclear bunker and including Stonehenge, Hadrian’s Wall, Charles Darwin’s diaries and the Duke of Wellington’s boots.
The most recent addition to the National Heritage Collection was the medieval Harmondsworth Barn in west London – dubbed by poet John Betjeman as ‘the Cathedral of Middlesex’ – and rescued by English Heritage in 2012 from years of neglect and decay.
Full article: http://www.english-heritage.org.uk/caring/heritage-centenary/1913-ancient-monuments-act/
Stonehenge Tour Guide
The Ancient Monuments Consolidation and Amendments Act of 1913 recognised for the first time that there are physical remains of the nation’s history which are so special that the state has a duty to protect them.
English Heritage’s origins stretch back to this Act which effectively established the National Heritage Collection and created many of the powers used to safeguard the country’s unique legacy of historic buildings, monuments and landscapes. In this part of our website, you can find out more about the Act and how we are celebrating its anniversary.
The 1913 Ancient Monuments Act
This year, 2013, is the centenary of a landmark moment for England’s heritage. The passing of the Ancient Monuments Consolidation and Amendment Act in 1913 recognised for the first time that there are physical remains of the nation’s history which are so special and so significant that the state has a duty to ensure their continued survival.
There were fears that the castle would either be demolished for the value of its materials or dismantled brick-by-brick, transported across the Atlantic, and re-erected on American soil. An attempt by the Office of Works to gain control of the Castle came to nothing and the National Trust turned down the chance to buy it.
At the eleventh hour, Lord Curzon, the former Viceroy of India and restorer of the Taj Mahal, stepped in and made an offer to buy the Castle and land around it, which the Americans accepted. Using his connections he had the ports watched so that the fireplaces could not be smuggled out of the country. After a tip-off, they were found in a mews in London. Draped in Union Jacks, they were mounted on horse-drawn carriages, and triumphantly returned to the castle in 1912
The dramatic rescue of Tattershall was taken as the prime example of the need for action when in 1912 Parliament was preparing to strengthen protection for historic buildings and monuments. Speaking in the House of Lords on 30 April 1912, Lord Curzon declared:
"The whole attitude of this country and of the civilized world in general has changed towards archaeology in recent years. We regard the national monuments to which this Bill refers as part of the heritage and history of the nation…they are documents just as valuable in reading the record of the past as any monument or parchment deed…there is the case of Tattershall Castle in Lincolnshire…In these cases the government in the existing condition of affairs is absolutely helpless. All it can do is to sit still and look on while these acts happen; the only power it possesses being the limited and almost futile prerogative given it by the legislation of 1882 and 1900."
Earlier Heritage Legislation
There were two Ancient Monuments Acts before the 1913 Act. The first in 1882 included a list of 68 prehistoric monuments in Great Britain and Ireland that, with the consent of their owners, would eventually be brought into the nation’s care.
The Act also provided for the appointment of one or more Inspector of Ancient Monuments to oversee and provide advice upon the protection of monuments. An editorial published in The Times in 1882 noted that the Act in its current form would be of limited interest to the wider public: ‘England will not go mad yet on clay funerary urns, flint heads and scrapers.’
By the end of the following year Pitt-Rivers had obtained 14 more monuments. However by the late 1880s progress had significantly slowed. As the process was voluntary, Pitt-Rivers had to stand aside whilst monuments were destroyed. Among these were prehistoric cup-marked stones at Ilkley, Yorkshire, carted off ‘probably to some rockery’.
Despite its shortcomings, the first Ancient Monuments Act did set a precedent. By the turn of the century several groups were campaigning for revised legislation. Among these were the Society for the Protection of Ancient Buildings and the recently founded National Trust (1895).
The Ancient Monuments Act of 1900 resulted in a major transfer to the Office, later the Ministry, of Works (English Heritage, Historic Scotland and Cadw are the Office’s direct successors) of historic buildings and monuments in the care of other Government departments. Nonetheless there were still no compulsive measures to protect the physical remains of the nation’s history.
The 1913 Ancient Monuments Act or – to give the Act its full title – the 1913 Ancient Monuments Consolidation and Amendment Act changed all that. Given Royal Assent on the 15th August 1913, the Act repealed everything so far established and started again – its provisions essentially governed protection of ancient monuments until 1979.
Preservation Orders and Scheduling
The Act did three new things. It introduced a system whereby the Office of Works could issue a compulsory ‘Preservation Order’ when a monument or building of sufficient ‘historic, architectural, traditional, artistic, or archaeological interest’ was at risk of demolition by a private owner.Each order would need an Act of Parliament to confirm it, making it an unwieldy instrument, but the Act did at least establish the principle that some buildings in private ownership might, if they were important enough, warrant the intervention of the state to save them.
The second major innovation was the ‘scheduling’ of monuments. This involved compiling a list, or schedule, of monuments which were deemed by an expert board to be of ‘national importance’. Once a site was on the list and the owner informed, it became a crime to damage it.
Under the Act, the Office of Works could give free advice to an owner regarding the treatment of an ancient monument on their land and could oversee any works free of charge. Scheduling considerably widened the scope of protection to the thousands of monuments on private land rather than just those in Government or local authority care.
These two initiatives – the preservation order and scheduling – established the statutory protection of those parts of the nation’s heritage in private hands. It would develop in future years through the listing system and a rapidly evolving planning system.
A National Heritage Collection
Finally under the 1913 Ancient Monuments Act, the powers of the Office of Works to collect, or take into guardianship, monuments of outstanding importance were strengthened. Public access was made a right for all new guardianships.Four historic sites were acquired under the new Act that year:
- Lindisfarne Priory, an important centre of early Christianity in Northumberland;
- Yarmouth Castle on the Isle of Wight, the last and most sophisticated of Henry VIII’s coastal forts;
- 12th century Framlingham Castle in Suffolk; and
- Finally on the 19th December 1913 – the sandstone ruins of Penrith Castle in Cumbria, home of the future king, Richard III.
In 1912, the Education Minister Charles Trevelyan argued that the bill was not simply an antiquarian issue ‘but that it should be realised that part of the character of the nation which depends upon the appreciation of the past may really be affected by the preservation of these monuments…the nation ought to learn about its past through what is left of its monuments’. Museums, he said were important, but ‘a thing in a museum does not strike the imagination of a young person nearly as vividly as a building.’
Since 1913, the National Heritage Collection has grown considerably and is today Europe’s most ambitious outdoor museum, consisting of 880 historic monuments and properties. English Heritage looks after 413 sites as well as their contents and archives, ranging from prehistoric stone circles to a 1960s nuclear bunker and including Stonehenge, Hadrian’s Wall, Charles Darwin’s diaries and the Duke of Wellington’s boots.
The most recent addition to the National Heritage Collection was the medieval Harmondsworth Barn in west London – dubbed by poet John Betjeman as ‘the Cathedral of Middlesex’ – and rescued by English Heritage in 2012 from years of neglect and decay.
Full article: http://www.english-heritage.org.uk/caring/heritage-centenary/1913-ancient-monuments-act/
Stonehenge Tour Guide
Saturday, 12 January 2013
Can British heritage sites compete on the world stage?
Our expert panel (Which.co.uk) rated Avebury in Wiltshire as one of the best heritage sites in the world, beating the pyramids of Egypt and the Taj Mahal for visitor experience. Do we take our extraordinary heritage for granted?
With an expert score of 78%, Avebury came second only to the ancient Zapotec capital of Monte Alban in Oaxaca, Mexico, when rated by a panel of Which? experts against a range of criteria.
Most people know the site for its enormous stone circle, but there’s much more to this prehistoric complex, including ancient burial chambers and the vast man-made Silbury hill, dating back around 5,000 years.
Taking on the world
There’s no doubting Avebury’s importance – it is after all a Unesco World Heritage Site – but I was astonished to find that it could compete with iconic sites like Peru’s Machu Picchu or Jordan’s Petra.
But our experts were adamant. On every single aspect that we judged to be important for a great heritage visit, Avebury scored highly. While the stone structures may not be as well preserved as say,Machu Picchu, they are considerably older. Up to 5,000 years older, in fact.
And unlike at its sister site, Stonehenge, the visit is not sanitised. You can turn up at any time, day or night. You can walk freely among the stones and try and imagine how on earth these 40-60 tonne monoliths were moved into place by manpower alone. You can even hug the stones if you feel so inclined.
And where else in the world would monuments of such historic importance be left alone to gently integrate with the landscape and become a feature of everyday life for subsequent generations?
A heritage site without the hassle
So many world heritage sites are ravaged by commercialism and mass tourism. Visitors face overpricing, queues and hawkers, as they are rushed around a site that is mostly fenced off and inaccessible. Not so Avebury. Visitor numbers are intentionally kept low, the site is clean, quiet, free to visit and ecologically and culturally sustainable.
Still not convinced? Nor was I. So I visited on a crisp November morning and I must admit there is something magical about the place. It may not be perched on a mountain-top, but the setting has its own quintessentially English charm. As the world gets smaller and we regularly jet off in search of the exotic, are we becoming blasé about the historic wonders of our own green and pleasant land?
Have you visited Avebury or other British prehistoric monuments? How do they compare to other major heritage sites around the world?
Which magazine link: http://conversation.which.co.uk/transport-travel/avebury-can-british-heritage-sites-compete-petra-pyramids-stonehenge/
Stonehenge Tour Guide
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