Curators at the San Diego Natural History Museum have enlisted University of California, San Diego archaeolo- gist Dominique Rissolo as a content expert for a new exhibition offering insight into the ancient Maya.

The limited-engagement exhibition, “Maya: Hidden Worlds Revealed,” opens today at the Balboa Park museum and will be on view through Jan. 3, 2016. The 10,000 square foot exhibition – the largest of its kind to be presented in the United States – delves into the history of the ancient Maya, who thrived in regions of Belize, Mexico, Honduras, Guatemala and El Salvador from A.D. 250 to A.D. 800. It features more than 200 authentic artifacts, dozens of interactive components, life-size replicas of temples and the iconic sculpted monu- ments known as stelae. “This exhibition gives an unprecedented view of the kinds of artifacts and Maya pottery that you would never be able to see outside the country of Belize, and some of these pieces are on view for the first time,” says Rissolo, who is Special Projects Coordinator for the Cen- ter of Interdisciplinary Science for Art, Architecture and Archaeology (CISA3) at the UC San Diego Qualcomm Institute.

Rissolo, who has been conducting research in the Maya area for nearly 25 years, says the exhibition offers “a sweeping view of a civilization and its contributions to humanity in a way that’s never been done before.”


(left) Maya mosaic mask and (right) Maya Huipil, both from “Maya: Hidden Worlds Revealed”. All photos courtesy of the San Diego Natural History Museum

Rissolo was recruited by The Nat to work with staff on textual and outreach materials for the exhibition. He’ll also give a lecture in Sep- tember on his work at CISA3 to digitally document and visualize coastal caves that were frequented by the ancient Maya in the Quintana Roo region of Mexico.

“We’ll be sharing with folks some of the work we are doing here at CISA3 to use laser scanning and structure-from-motion imagery to create digital fly-throughs of some of the cave sites we’re documenting through our project on Maya cave architecture,” he said, adding that the lecture will also feature some of the research conducted by CISA3 undergraduate Dominique Meyer, graduate student Michael Hess, the Qualcomm Institute’s Eric Lo and CISA3 alumna Aliya Hoff.

Rissolo’s research isn’t the only Maya-related work being pursued at the Qualcomm Institute: QI research scientist and National Geo- graphic Emerging Explorer Albert Lin, UC San Diego Professor of Computer Science Ryan Kastner and QI Principal Design Engineer Curt Schurgers recently returned from the Mesoamerican archaeological site – formerly an ancient Maya city – known as El Zotz. Their research into the early iconography of buried temples, as well as the footprint the an- cient city had on the landscape, is focused on building a better understanding of how an ancient dynasty established itself as a seat of power within the complex milieu of ancient Maya city-states. A peek into that history is also on display in The Nat’s exhibition, which was created by the Science Museum of Minnesota, the Denver Museum of Nature & Science, and the Museum of Science, Boston. It features interactive elements that offer visitors the opportunity to decipher ancient symbols, explore tombs and investigate the Maya approach to technology.

The Maya, for example, lacked wheeled vehicles, beasts of burden or easily trav- eled rivers, but developed an entirely unique written language using more than 800 heiroglyphs and built reservoirs and extensive road networks. They created a dental technique for drilling precise holes into teeth and were also – to use a phrase from the exhibition – “relentless renovators,” layering new buildings over old ones.


Maya funerary urn

“They also developed the concept of zero independently of the Old World and were astute sky watchers,” adds Rissolo. “They created a concept for permutating calendars and were able to reckon notions of cyclical time and linear time in ways that still fascinate us and are still the subject of scholarship today. They were also keenly aware of the movements of the sun, moon, and planets and were able to very accurately predict eclipses in different parts of the world that they couldn’t see.”

Featured throughout the exhibition are replicas of ancient monuments and temples bearing the the famous iconography of the Maya, which often depicts mythological and narrative subjects like serpents, birds and jaguars. The exhibition notes that the Maya burned 1,000 acres of forest for every building coated in stucco – deforestation that might have influenced rainfall and caused water shortages that (combined with mutually destructive warfare) led to the civilization’s downfall. But the Maya also showed a capacity for sustaining themselves and thriving in otherwise marginal landscapes, says Rissolo.

Maya crocodile effigy

Maya crocodile effigy

“The Maya were probably more astute and disciplined managers of their environment than we give them credit for, and there were pe- riods of Maya history where they were doing things right,” he adds. “These are the people who first cultivated some of the most impact- ful domestic plants in the world. Think about all of the food Meso- americans gave us: Chocolate, tomatoes, chili peppers. Corn was developed by the Mesoamerican cultures, and now the entire planet has been impacted by corn. These are people for whom the word industrious is an understatement.”

The exhibition and Museum will be open from 10 a.m. to 5 p.m. daily (closed on Thanksgiving Day and Christmas Day). Tickets to the exhibition range from $11 to $29 and advance purchase is recom- mended. For additional information about the exhibition, visit sdnat. org/maya or call 877.946.7797

Media Contact

Tiffany Fox
(858) 246-0353

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Maya: Hidden World Revealed

Dominique Rissolo is the newly hired Special Projects Coordinator for the Center of Interdisciplinary Science for Art, Architecture and Archaeology (CISA3) at UC San Diego, and he has embarked on a new search for funding and collaborations that will ensure the Center’s many cultural heritage projects not just survive, but thrive. Rissolo says CISA3 researchers are finding that “a lot of off-the-shelf tools really aren’t appropriate for scientific field research, which speaks to the expertise of our students and the unique contributions to cultural heritage research that are possible through computer science and engineering. Another big challenge is the integration of sensors with the aerial or underwater platforms. This is not just about creating pretty visualizations of objects and sites, but collecting data – in a variety of modes – that have real diagnostic and analytical value.” Underwater systems, Rissolo notes, must be particularly robust. “If it gets wet and goes deep,” he says, “you’re eventually going to lose it. In the world of underwater systems, ’two is one and one is none’ because the failure rate is so high and the loss rate is so high. A big part of what we must do is try not to lose the vehicles, which means they need navigation systems that allow us to control the vehicles remotely.” The problem, adds Rissolo, is that the overwhelming number of systems out there, drone wise, are built for hobbyists: “Our students are really focused on developing the kinds of systems that are designed for scientists.”

San Diego, Calif., Feb. 19, 2015 — Late last year, two University of California, San Diego students set out for Florence, Italy, to diagnose a patient that had no prior medical record, couldn’t be poked or prodded in any way, and hadn’t been in prime condition for more than 800 years.

The ‘patient’ in question is the Baptistery of St. John, a basilica that sits in the Piazza del Duomo, adjacent to the famous Florence Cathedral (known colloquially as “The Duomo”). The students, structural engineering Ph.D. candidates Mike Hess and Mike Yeager of the Center of Interdisciplinary Science for Art, Architecture and Archaeology (CISA3), had been invited by the Museo dell’Opera del Duomo to conduct a structural ‘health assessment’ of the building, which was completed in 1128 and was the site where the Italian poet Dante and many other notable Renaissance figures were baptized.

Their resulting 3D digital model depicts a building that has aged gracefully, yet warrants careful and continued evaluation – not surprising considering the Baptistery has experienced several hundred years of settling and is situated in seismically active zone.

But there were indeed big surprises in store for the team, surprises that might have gone unnoticed were it not for the “high-tech gaze” of the advanced multi-spectral, high-resolution tools they used to see behind walls, underground and directly into the past.

Warmth, light and history


CISA3 students Mike Hess (left) and Mike Yeager constructed a comprehensive 3D model of the interior, exterior and facade of the 5,500 square foot Florence Baptistery as well as certain areas of the Duomo.

Before they could look into the past, the team’s first order of business was to create an accurate record of the Baptistery’s current condition.

Using LiDAR (light detection and ranging) laser scanning, ultra-high-resolution photography and thermal imaging techniques, Hess and Yeager constructed a comprehensive 3D model of the interior, exterior and facade of the 5,500 square foot Baptistery. The result includes stunningly realistic 3D models of the Baptistery, its marble sarcophagi and baptismal font, computed from thousands of photos using photogrammetry techniques. Those techniques are spatially referenced to the one and half billion 3D data points captured by the LiDAR scanner.

“This is a building constructed hundreds of years ago for which there are few original plans or drawings,” notes Yeager. “One of our goals was to create a record, which is an exact representation of the Baptistery as it stands today and will serve as a critical reference, tomorrow, next year or a hundred years from now.

“The point cloud data – taken from 80 LiDAR scans – becomes the geometric scaffold for the high-resolution thermal imagery,” Yeager continues. “The data can be projected into 3D space so we know exactly what we’re looking at spatially. The drawings are spatially accurate and we can now pull a measurement for any part of the building we want to look at, down to the millimeter.”

To obtain the thermal imagery, Hess built a custom mobile robotic thermal camera platform that captures thermal data at unprecedented resolution. These high-resolution images reveal, for example, that some of the tiles in the Baptistery’s mosaic ceiling – rumored to be the inspiration for Dante’s “Divine Comedy” – are separating from the structure in ways not yet visible to the naked eye.


Deviation analysis of the Baptistery’s ceiling reveals information that is critical for the understanding and long-term stewardship of the historically and culturally significant site.

Adds Hess: “It essentially stitches many images together into a big mosaic of the structure at the level of detail we need to inspect it for structural flaws, see where areas have been restored or map areas of moisture and cracks.” Hess is also a scholar in the CISA3 Integrative Graduate Education and Research Traineeship (IGERT) program, supported by NSF, which prepares Ph.D. scientists and engineers from a variety of disciplines to solve complex research problems of scientific and societal significance at national and international levels.

Hess and Yeager’s work was funded by CISA3 (which is based at the UC San Diego Qualcomm Institute), as well as the National Science Foundation (NSF), the Friends of CISA3 and a grant from the UC San Diego Los Alamos National Lab Engineering Institute by way of the U.S. Department of Energy. It was preceded by previous imaging done by CISA3 researchers in collaboration with its long-term local partners from Editech and Geostudi Astier. Cultural heritage engineer Maurizio Seracini, who has provided CISA3 with a home base for its research activities in Florence for the better part of the past decade, also collaborated with the team.

Their resulting digital model, says CISA3 Director Falko Kuester, allows the viewer to “literally teleport to these places at photorealistic levels and to see what otherwise cannot be seen, revealing information critical for the understanding and long-term stewardship of this remarkable site.”

Adds Yeager: “A darker shade of marble might indicate, for example, that the slab was replaced. That’s not a structural application, but it builds out the history of the structure. It’s a way of seeing underneath the surface to get the true state of conservation of the structure.”

Getting to the bottom (and top) of it


Hess and Yeager used a laser scanner to document the excavation under the Baptistery floor and also visualized, for the first time, an unexcavated portion of Roman ruins from the 5th century A.D.

Another of the team’s objectives was to take a more literal look underneath the surface of the building – right down into the dirt. Beneath the tiled floors of the Baptistery lie the ruins of a Roman temple built in the 4th or 5th century A.D., part of an ongoing excavation that began in the 1970s.

With the help of Seracini, Gianfranco Morelli from Geostudi Astier and IGERT-TEECH trainee and big-data visualization expert Vid Petrovic, Hess and Yeager used ground-penetrating radar to visualize, for the first time, an unexcavated portion of the ruins. Their data reveal what is hypothesized to be a staircase, two vaulted rooms and a series of walls and hallways.

“We’ve been able to visualize these ancient spaces in a way that’s never been done before,” says Yeager. “Now we’re able to use this technology to reference that data in space and ‘fly’ from the domed ceiling of the Baptistery down into the dirt to the ancient rooms beyond.”

In addition to the remarkable discovery of the Roman rooms, Hess and Yeager also determined from their scans that the floor above the excavation site differs dramatically from that above the unexcavated ruins – but not in the way one might expect.

“In the area that has been excavated, there now is a lot of open space, just air,” Yeager explains. “One would intuitively think the floor would be more prone to settling over the void space, but by analyzing the laser scanning data of the floor we see that’s not what’s happening.”

“There is a very dramatic drop in the vertical elevation of the floor, but it’s over the unexcavated portion,” Hess continues. “In the excavated area the floor of the Baptistery has been converted into a reinforced concrete slab, and we’re postulating that when concrete slab was placed over the excavation site, it over-stiffened that part of the structure, causing it to settle more slowly.”

Yeager holds up this counter-intuitive fact as an example of “the true power of diagnostic imaging techniques” that the CISA3 team is developing.

“These tools are allowing us to verify and validate what’s going on and provide answers we wouldn’t ordinarily be able to,” he says. “Now we can ‘fly’ around the model and visualize loading paths in a way that we could not by naked-eye inspection.”

Protecting and preserving the past

With the data from the Baptistery as a proof-of-concept baseline for doing large-scale structural health assessments, Yeager and Hess also got permission to capture data from the Baptistery’s larger and more well-known neighbor, the Duomo.


Deviation analysis shows the floor of the Baptistery is not uniformly level — but not in the way the engineers expected.

Says Hess: “The Baptistery was the testbed for the methodology, but the Duomo is a huge structure, and we want to set the foundation for documenting it. We’ve proven that this is the way to do it and now we can expand it and go bigger.”

With the data they captured from the Duomo (which required standing in the precarious far side of the plexiglass that keeps tourists from falling to their deaths), Hess and Yeager created a digital model of the dome, as well as the space between the two shells of the Dome that contains a staircase tourists climb to overlook the city from its highest point.

With 3D data they’d captured at the Baptistery, they measured structural deviations from an idealized curvature of the cathedral’s dome.

“This kind of measurement gives us an idea of how the dome is surviving,” Yeager explains. “We can see from the laser scanning analysis that the weight of the dome is causing an outward thrust at the bottom. For years, people have speculated this, but we were able to actually quantify it and visually show that there’s a definite eight centimeter bulge.”

“Our ultimate goal,” he continues, “is to take a structure and discretize it into a bunch of little bitty pieces to build a numerical model. We can then load the structure any way we like and use modeling techniques to determine real forces and stresses that are being absorbed by the structure. We could have a model of the Baptistery or the Duomo – structures susceptible to earthquakes – and see how these buildings would respond in real life, which could help us to design a potential retrofit.”


Members of the CISA3 team, including CISA3 Director Falko Kuester (in white shirt), met with Franco Lucchesi (in black jacket) to demonstrate their visualization of the Florence Duomo and Baptistery on the QI WAVE.

Franco Lucchesi, president of Opera Del Duomo Firenze, recently visited CISA3 in San Diego to see the data that the team obtained come to life in its advanced visualization environments, including the WAVE, a 70 megapixel resolution virtual reality environment that provides an unprecedented degree of presence (the feeling of ‘being there’). Remarking that CISA3’s cultural heritage engineering methodology is uniquely positioned to provide important insights into the understanding and preservation of these monuments, Lucchesi invited the UC San Diego team to further expand its collaboration with the Opera Del Duomo.

“Being invited to work at this remarkable site – while bringing stakeholders, researchers, practitioners and the public together in pursuit of ‘creating a future for the past ’ through science and engineering – is truly a privilege,” says Kuester. “The diverse, interdisciplinary and highly professional student teams working on this and other CISA3  projects are our pride and joy.”


A visualization of the Florence Duomo as seen on the QI WAVE virtual reality tool, a 70 megapixel resolution virtual reality environment that provides an unprecedented degree of presence.

In the meantime, Hess and Yeager say the opportunity to play even a small role in this important conservation effort is an honor and a privilege.

“The feeling of walking in with the lights off, having the place to yourself, being in this giant amazing space – it never gets old,” says Hess.

“These structures are monuments of what human beings can create,” adds Yeager. “They are stunning and gorgeous and beautiful. Being able to play a small part in potentially conserving these timeless jewels of human craftsmanship is time really well spent.”

Media Contacts
Tiffany Fox, (858) 246-0353,

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Museo dell’Opera del Duomo