Tag: Laser scanning

Teotihuacan Tunnel found under Temple of Quetzalcoatl, the Feathered Serpent

3D image tunnel entrance temple of the feathered serpendArchaeologists have discovered a 1,800 year old tunnel that leads to a system of galleries 12 meters below Teotihuacan’s Temple of Quetzalcoatl, the Feathered Serpent, in Mexico.

Spanning an area of more than 83 square kilometres, Teotihuacan is one of the largest archaeological sites in Mexico and is a UNESCO World Heritage Site. The city had nearly 250,000 inhabitants when it was at its height in the early 1st millennium AD. It also contains some of the largest pre-Columbian pyramids in the New World.

Archaeologists hope that the galleries they detected are actually the tombs of Teotihuacans rulers. “For a long time local and foreign archaeologists have attempted to locate the graves of the ancient city’s rulers, but the search has been fruitless, said project director Sergio Chaves Gomez. “That’s why every day our expectations are increasing, as there are many chances that they are sitting inside a large tomb or offering.

As early as 2003 archaeologists suspected the tunnel was there after a rainstorm caused the ground to sink at the Temple of Quetzalcoatl, also known as the Feathered Serpent Pyramid. It took archaeologists Gomez and Julie Gazzola several years to plan the excavations and raise the necessary funds. They began work last year and discovered the entrance to the tunnel a few weeks ago.

several indications suggest that access to the underground passage was closed between 200 and 250 AD, probably after depositing something inside

Before the start of the excavations, a systematic survey of the tunnel was made. Ground penetrating radar or GPR and laser scanning were used to generate a 3D image of the archaeological site, allowing researchers to estimate the length of the tunnel, and to confirm the presence of the rock-cut chambers.

The tunnel is accessed by a vertical shaft of almost 5 by 5 metres wide and runs 14 metres deep, which gives access to a corridor nearly 100 metres long ending in a series of rock-cut galleries which may be the tombs of Teotihuacan’s rulers.

The entrance to the underground passage which runs under the Temple of the Feathered Serpent, the most important building of Teotihuacan’s Citadel is located only a few metres away from the temple itself .

A small opening was made and the scanner captured the first images. Angel Mora, from the CNMH Technological Support Unit, and engineer Juan Carlos Garcia, scanner operator, mentioned that when introducing the laser only a 37-meter length was registered for the tunnel. According to Mora, this indicates that the beam bumped into something, maybe rocks, a landside, or a change of level.

Ausgrabungen Sergio Gomez vor Quetzalcatl

The entrance to the 12 metres deep ancient tunnel, and Sergio Gomez in front of the excavation area, where he hopes to open a 1800-year-old burial chamber. Photos by Flickr user DerMikelele.

Although the archaeologists still have two metres to dig before they reach the tunnel’s floor, the images will help them plan how to enter the tunnel. So far, about 200 tons of soil and debris have been removed from the tunnel and nearly 60,000 fragments of artifacts have been recovered.

Specialists of Mexico’s National Institute of Anthropology and History (INAH) plan to enter the tunnel in about 2 months time, when the vertical shaft is fully excavated. Then, they’ll start scanning the tunnel, which leads away east from the entrance.

The complete process might take another 2 months of work, we must continue exploration the same way done so far, to avoid losing important information that will allow us knowing activities conducted there by Teotihuacan people hundreds of years ago and why they decided to close it, mentioned Gomez Chavez.

Why was the tunnel closed?

It is not known why or when exactly the tunnel was closed. Yet, the excavation of the shaft has already offered some clues, says Gomez. He adds, “several indications suggest that access to the underground passage was closed between 200 and 250 AD, probably after depositing something inside.

The archaeologists now know for certain that the tunnel already existed when the Citadel and the Temple of the Feathered Serpent were constructed. When the tunnel was closed, large stones were thrown in to block its access. It is thought this happened around the same date of a large structure because of its shape thought to be a ball court.

Let’s hope Mr Gomez hasbetter luck than Dr Hawass when reaching the end of the tunnel of Seti I? As so far, no ‘royal remains’ have been found at Teotihuacan,the discovery of some kind of King (albeitlong time deceased)wouldmake foran amazing discovery.

A Reason for Rezzing: How and Why We Built King Tut Virtual

builder article2

Hi. I’m one of the builders of King Tut Virtual. My job is taking historical sites and artefacts and reproducing them in an immersive environment that you can explore. This artificial world is only one aspect of Heritage-Key’s large multi-faceted online presence. As virtual worlds are a bit novel, I’ve been asked to explain what we did, how we achieved it, and tell you a bit about the rationale of our approach. More general information about the virtual world is covered in other articles.

What is Heritage Key Virtual?

HK Virtual allows you to explore a 3D reconstruction of historical sites. We’re all familiar with exploring 3D environments in games, and this is a similar concept with more serious content and goals. You explore this environment using an avatar – a 3D representation of yourself. This proxy self assists your interaction in the virtual world, giving a sense of presence and identity allowing you to move about and talk or interact with others.

Our first public project was to reproduce the treasures of King Tutankhamun. These were discovered by Howard Carter in 1922 in the Valley of the Kings, Egypt – the massive burial site of many Egyptian pharaohs, most of which had been plundered of their most interesting treasures in previous centuries. (In fact many of the tombs had been plundered thousands of years ago by subsequent pharaohs!) That the tomb had remained unopened made this a significant archaeological find. The incredible cache of riches encased inside made it even more so. The boy king became a global hit, and still draws millions of visitors to exhibitions around the world.

We built a miniature version of the Valley of the Kings (circa 1922) so that visitors could get a sense of the layout of the tomb complex. One can walk down into Tutankhamun’s tomb and view the wall paintings. We reproduced the most significant burial artefacts, including the death mask – perhaps the most recognizable and famous archaeological find of this century. A reproduction of a pharaoh’s house was built so one could experience life on the Nile delta in ancient Egypt. (The house is modelled on the house at Amarna, but is an interpretation as archaeologists are still arguing about the finer details.)

To enhance the experience of these 3D environments and artefacts we created a web-like information system and audio tours to tell folk more about interesting features (and in-world movies are coming soon too.) To provide some light all-ages entertainment we even created an archaeological digging game – which is educational to boot.

Work on the King Tutankhamun material continues, but we’re secretly hard at work building further historical sites, artefacts and activities that we’ll reveal soon.

How did we do all That?

I’m glad you asked. The first things to be built were Tutankhamun’s treasures. These artefacts were meticulously reproduced by hand in 3D modelling applications using measurements and photos (by Sandro Vannini) of the actual objects – both as reference, and in the case of the photos, actually mapped onto the 3D model. When you’re looking at these reproductions, in a sense you’re looking at a 3D photo of the actual thing.

I’m often asked why we don’t use 3D laser scanning (which is in common use in the archaeological community now for documenting objects). This technology is quite wonderful, but produces very large datasets. These make it very difficult to reduce the complexity to a level that is friendly to the speed of home computers and bandwidth of an internet connection.

As players of current generation computer games will be aware, one pays for super high visual quality beforehand by waiting a long time for content to download, yet this still compares unfavourably to an actual photograph. We’ve left the ultra high rez scans to the realms of academic study and integrated real photography to show finer detail when required. Our objective was to allow the experience of history, so have worked hard to keep the experience quick and lean, rather than overemphasize redundant fidelity at the expense of usability.

Our reproduction of Tutankhamun’s tomb and treasure, the Valley of the Kings and Amarna used many references. We called on satellite imagery, Howard Carters original notes (which we’ve found sometimes inaccurate and misleading), and great archaeological resources such as the Theban Mapping Project. The photos Harry Burton took of the Carter dig in the 1920s were invaluable in reproducing the period. Photo reference by Sandro Vannini also played a huge part, and his photography can be seen in a dedicated virtual gallery and the in-place artefact documentation.

Originally we prototyped the build in the ‘Second Life’ virtual world. Though this had its limitations, it allowed us to access a large pre-existing audience for “user acceptance testing” (as they call it in the industry.) When we had gained enough insight we moved the project onto OpenSimulator – a related virtual world technology that we are able to host ourselves, extend and refine how we wish.

We simplified the overly complex experience by designing new “client” software to allow folk to connect to our virtual world. The Heritage-Key Viewer provides streamlined access, without the many confusing options not directly related to experiencing our world. A one-click web-based login system eases entry – everything is tied back to the heritage-key.com site.

We also extended heritage-key.com to act as a traditional web CMS (content management system) for the virtual environment. Traditionally viewing 2D content in virtual environments has been a bit clunky, and usually designers have simply relied on breaking out of the 3D environment to a web browser. We have used this approach when appropriate too – but believe it often breaks a sense of immersion and engagement. Instead we are bringing web-like content into the world itself. This requires a novel approach to writing and design which you’ll see in the “library pages” throughout HK Virtual, and soon in a new orientation system. This system also serves audio narratives, and soon video.

Why did we do This?

We feel that there is value in finding new ways of exploring our own heritage which leverage the internet age. It’s easy to

When we see a representation of a human (such as our avatar) doing something, parts of our brain fire as if we were actually doing it ourselves… It is almost as if we have tiny avatars living in the premotor cortex and parietal lobes of our brains.

forget that Google is only eleven years old, yet it has had a profound effect on how we understand and access information. The immersive internet (3D) is still in its infancy, yet millions engage in online gaming on a daily basis. We have come to realize that there may be other value to be gained from immersion than pure frivolity.

Several of our team members have previous experience in the education sector, where various “learning styles” are employed to optimise retention and understanding. Basically some folk learn best by seeing, or exploring on their own, by engaging in activities or by some combination thereof etc. The written component of learning is well catered for by the web. It stands to reason that immersive environments may present new opportunities for addressing other learning outcomes.

There has been research into using multiple simultaneous media and immersion (so called multimodal learning) since the 1950s’. However, due to an unfortunate circumstance, many of the outcomes of this approach have been derailed. (You can read about the myth of “Dale’s cone of learning” and efforts to redress it in this pdf. ) So the prevailing theory, even when well applied, has lead to lacklustre learning outcomes.

So what do we actually know, now that reliable empirical research into learning styles (from the cognitive and neuro sciences) is appearing? Several potentially useful facts emerge:

  • Retention is improved through words and pictures rather than through words alone.
  • Students learn better when corresponding words and pictures are presented near each other rather than far from each other on the page or screen.
  • The more complex the material becomes the greater the gains from “stage managing” the experience (Direct manipulation, animation, pacing etc.)
  • Students engaged in learning that incorporates multimodal designs, on average, outperform students who learn using traditional approaches with single modes.

There are many areas of learning where multi-media and immersive environments are a distraction rather than help to learning. Virtual worlds aren’t a magic bullet approach, but where appropriately designed and applied immersive environments can show measurable gains in retention and understanding.

Now for the Science bit…

Neuroscience is starting to unravel mechanisms to explain these gains. Of particular interest are mirror neurons – parts of the brain which fire both when we perform an action, and when we see an action performed by others. These have been found in the human brain closely associated with areas involved in our understanding of visual/spatial information (and perhaps language acquisition.) (See Mirror Neurons and Common Coding Theory.)

When we see a representation of a human (such as our avatar) doing something, parts of our brain fire as if we were actually doing it ourselves. This helps explain how – once the novelty wears off – exploring virtual spaces with an avatar can give us such a strong sense of immersion. It is almost as if we have tiny avatars living in the premotor cortex and parietal lobes of our brains. At the very least, this internal representation gives us an intuitive sense of relative scales when exploring. It probably helps our understanding in many other ways that we are yet to discover.

While science debates the mechanisms behind immersion, we can still use it to our advantage. We can virtually dig up artefacts, explore Carters archaeological site, or unravel the many layers of Tut’s burial trappings – all achieving a hands-on sense greater than through reading (or video) alone. This feeling of immersion grounds the imagination and provides an extra layer of empathy with the material.

Cognitive science aside, avatars have psychological benefits. The avatar, as a representation of a human being, is the most natural metaphor for communication in immersive spaces. Exploring can be an educational, social and shared experience. It needn’t be all about education either – immersion and engagement are what they are regardless of what end one wishes to apply them to. For us, it’s all about creating experience.

Egypt and Japan Launch Joint Venture Uses Satellites to Sniff Out Egyptian Sites

feluccas on the nile

Workmen may just have downed tools after laser scanning the Sphinx, but a new Egyptian-Japanese venture aims to seek out even more archaeological hotspots along the Nile, using technology at the bleeding egde of science. The far-flung team, headed by Egypt’s National Authority for Remote Sensing and Space Sciences, hopes to reach areas in the river’s western Delta and nearby El-Beheira governorate, whose geography has resisted conventional techniques thus far. The team has already employed satellite imaging and remote sensing devices to map heritage sites in the area, and experts are confident more will appear when a second phase gets under way next February.

The Authority’s work is being carried out by cohorts from the country’s Supreme Council of Antiquities and Japan’s Waseda and Tokai universities. And as well as uncovering some ancient wonders, the team is hoping it can discover more about the Nile’s geological history. This could in turn lead to even more breakthroughs, as more could be learned about how the ancient Egyptians settled along the world’s longest river thousands of years ago.

Egyptian archaeology is enjoying something of a gadgetry renaissance of late

Egyptian archaeology is enjoying something of a gadgetry renaissance of late, with not only Giza‘s laser-scanning coup but a glut of mummy CSI cases, as experts rush to radiograph some of the empire’s most alluring enigmas. Yet while preservation and identification will whet the appetites of Egyptologists, the discovery of new heritage sites will ignite the passions of history lovers the world over. Satellites have long been regarded as key archaeological tools, with sites like Syria’s Tell Brak benfitting from the pioneering work by experts like Harvard University’s Jason Ur. The extensive mapping carried out by Google Earth has caused its own stir in recent years, and has even spurred on a number of Atlantis theories with apparent grids being spotted in the Atlantic Ocean.

The Replica Valley of the Kings – King Tut Gets Another Tomb

Recently the Egyptian Supreme Council of Antiquities has shared it’s worries about the future of the tombs in the Valley of the Kings with the world. Now they share more details on the planned solutions: ventilation systems, special lighting and… well, we expected a replica of KV62, but we’re getting an entire new Valley of the Kings on the cliff side of the real one.

Daily thousands of tourists visit the tombs of King Tut, Seti I, Ramses, Horemeb (recently re-opened) and Queen Nefertari. All well, were it not that the quantity of humidity and fungus generated through breath and sweat is gradually eroding the soft stone of the chambers, slowly destroying paintings and carvings thousands of years old. Dr Hawass has now confirmed that closing Tutankhamun, Nefertari and Seti I’s tombs is the first step in the new plan to protect the Valley of the Kings. Others will get added protection.

As a first step, the SCA is currently installing a cool lighting system in the Valley of the Kings so that people can visit the tombs in the evening. This will help protect the paintings as it will spread the number of visits over the course of the day. “It will also allow the tombs to escape from the extra head and moisture that builds up in them throughout the day,” Dr. Hawass said.

Some of the "unfinished" walls in Tomb of Horemheb (KV57)Dr. Hawass tells Al-Ahram that 13 royal tombs – out of a total of 63 – in the Valley of the Kings were open but no one visits them. Once the most popular tombs are closed tourists will be more encouraged to visit the others. The original tombs can still be entered, but at a price. “Whoever wants to visit the original tombs of Tutankhamun, Seti I and Nefertari must pay a huge amount of money,” Hawass says.

As for the tombs of Tutankhamun, Seti I and Nefertari, Hawass said a plan to protect them was now being implemented in collaboration with the British organisation Adam Lowe of Factun Arte. The plan is to create identical replicas of these tombs by making detailed high-resolution copies of the burial chambers, paintings and sarcophagi using laser scanners. After the replicas have been constructed they will be installed on the cliff side of the Valley of the Kings, which will be called “The Replica Valley” where visitors can experience their beauty with the knowledge that the ancient paintings are being preserved. Hawass pointed out that missing fragments from these tombs now held in foreign museum, would also be scanned and added to the overall reconstruction to give a complete picture of the tombs. (Nevine El-Aref for Al-Ahram)

Starting next month tour guides will not be allowed to enter with their groups into the tombs at Beni Hassan in Minya, Giza and Saqqara. A model will be installed at the entrance of each tomb. While you wait for The Replica Valley to be completed, you can still check out our replica KV62 – based on superb photographs of the wall paintings by Sandro Vannini – and Tutankhamun’s treasures by getting yourself an avatar and exploring King Tut Virtual.

Laser Scanning gets Underway at Sphinx and Pyramids of Giza

The Great Sphinx and Pyramid of Khafre, Giza Plateau, Cairo, EgyptDr Zahi Hawass and a huge team of experts have just finished laser scanning the Great Sphinx, and now the Pyramids of Giza are being surveyed using the latest laser technology. Dr Hawass, who reports on the project in his blog, has employed the services of the National Authority for Remote Sensing and Space Sciences at the Mubarak Institute for the project, which saw Djoser’s Step Pyramid at Saqqara subjected to the same techniques in June by a Japanese group. The team hope to get the most accurate representation of the wonders to date, as Egypt attempts to model the pyramids and sphinx in a number of ultra-modern ways, such as Heritage Key’s very own King Tut Virtual.

A similar project was first undertaken between 1979 and 1983, as a German Archaeological Institute team headed by renowned Egyptologist Mark Lehner made a photogrammetric map of the sphinx, alongside detailed drawings. This groundbreaking work allowed the monument to be mapped precisely enough to begin a series of complicated restoration and conservation schemes, which have led to its current good state of health. The pyramid project, which has mapped the outside of the structures to within 5cm, has only lasted one month. The work has involved overhead planes and a 45m-high fire truck ladder. Dr Hawass and his team plan to survey the inner chambers and shafts of each pyramid next. Hawass hope that the important heritage sites of Luxor will also be paid a visit in the coming months. This includes, of course, the tomb of Tutankhamun – which has been mooted for closure in light of the toll tourism is taking on its hallowed walls.