# From Google Earth Studio to Hologram: A Pipeline for Architectural Visualization
## 3 Results  
Based on the established selection criteria, two iconic sites were selected for this study: the Basilica de la Sagrada Familia (Barcelona, Spain) and the Arc de Triomphe (Paris, France) (Figure 5). These landmarks, recognizable to most people, offer rich architectural detail and complex volumetric structures and were accurately represented within the Earth Studio dataset. While no rigid criteria restricted the choice, their high level of public recognition and strong geometric presence rendered them ideal candidates for testing the fidelity and visual impact of holographic reconstructions. Initially, the entire pipeline was developed using the Sagrada Familia. It was subsequently validated with the Arc de Triomphe to ensure generalizability and robustness, confirming consistent performance across different structural typologies. The Sagrada Familia, designed by renowned Catalan architect [PERSON], is a UNESCO World Heritage Site and one of the most distinctive examples of modernist architecture. Still under construction since 1882, the Basilica embodies a unique fusion of the Gothic tradition, organic symbolism, and advanced engineering. Conversely, the Arc de Triomphe, inaugurated in 1836, has been a monumental symbol of national pride, commemorating those who fought and died in France during the French Revolutionary and Napoleonic Wars. Its neoclassical design, sculptural relief, and central location at Charles de Gaulle make it one of Paris most historically and culturally significant landmarks. For both selected sites, a central viewpoint and optimal 120\({}^{\circ}\) sector were identified for image capture. For the Sagrada Familia in Barcelona, the Nativity Facade was selected (Figure 6a). Located on the northeastern side of the Basilica and facing Carrer de la Marina, this facade is renowned for its highly detailed, organic forms and deeply symbolic iconography, that is, hallmarks of [PERSON]'s architectural vision, which blends natural inspiration with spiritual meaning. Dedicated to the birth of [PERSON], the facade celebrates the themes of life, joy, and creation. It comprises three porticos, each representing the theological virtues of Faith, Hope, and Charity. The surface is adorned with intricate sculptural elements depicting bibilical scenes, animals, plants, and angels, all of which evoke  
Figure 5: Selected landmarks for holographic reconstruction. (**a**) The Basilica de la Sagrada Familia in Barcelona, Spain—an architectural masterpiece by [PERSON], combining Gothic and Art Nouveau forms, and a UNESCO World Heritage Site; (**b**) The Arc de Triomphe in Paris, France—a neoclassical monument commemorating those who fought and died for France during the Revolutionary and Napoleonic Wars. Both sites were chosen for their high public recognition, volumetric complexity, and strong representation in the Google Earth Studio dataset. the divine beauty of creation. Notably, the Nativity Facade was the first to be completed and the only one [PERSON] saw partially constructed during his lifetime. In Paris, the eastern facade of the Arc de Triomphe was chosen (Figure 6b), facing the Avenue des Champs-Elysees and viewed from Place Charles de Gaulle, with the La Defense skyline visible in the distance. This side of the monument is distinguished by two prominent relief sculptures: on the north pillar, Le Triomphe de 1810, by [PERSON], celebrates [PERSON]'s diplomatic and military achievements; on the south pillar, La Resistance de 1814, by [PERSON], symbolizes French resilience during the Allied invasion. Together, these sculptures have embodied themes of heroism, patriotism, and sacrifice, paying tribute to those who fought and died during the French Revolutionary and Napoleonic Wars. The architectural symmetry and historical gravity of this facade render it an ideal subject for volumetric holographic reconstruction.