The Holy Sepulchre and the challenge of studying holy sites
Nathan Steinmeyer April 11, 2022 0 Comments 329 views Share
Holy Archaeological Sites: The courtyard outside the main entrance to the Church of the Holy Sepulchre. Courtesy Nathan Steinmeyer.
Excavating archaeological sites is rarely easy or straightforward. Many factors can drastically hamper or even block an excavation. In the archaeology of the Holy Land, one frequent issue that arises is the continued use of historical and archaeological sites, especially religious ones, such as Jerusalem’s Church of the Holy Sepulchre. Archaeological projects are exceedingly rare in the Holy Sepulchre and even when excavations can happen, researchers face a slew of challenges. Now, a recent project that successfully carried out work in the Holy Sepulchre has outlined the challenges they faced as well as the solutions they came up with to solve them.
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Excavating Holy Sites—The Project
The joint British and Israeli team set out to study the thousands of small crosses carved into the wall of the Chapel of St. Helena, one of the oldest sections of the Holy Sepulchre. According to tradition, these crosses were carved into the walls by medieval pilgrims. Among their objectives was to “investigate whether these graffiti were made randomly by different pilgrims or, perhaps, the engraving of the crosses was an established ritual action, authorized by the church.” To study this question, the team set out to photograph the walls and combine the photos into a series of three-dimensional images that could be studied in greater detail.
Crosses carved into the wall of the Chapel of St. Helena. Courtesy Nathan Steinmeyer.
Excavating Holy Sites—The Challenge
The team got their chance in 2018 when the chapel was closed for renovations. However, they needed to work fast. In the end, the team was allowed only 2 days to conduct their project. The team had to double-check all of their photos on the spot and make any needed adjustments with only the equipment they had with them. They also had to contend with limited space. The project’s work area, located behind the chapel’s apse, was often narrower than 1 foot. The narrow confines, together with poor lighting, caused the team a great deal of difficulty, as most cameras cannot focus properly or photograph large surfaces under such conditions.
Yet another challenge was the limited equipment the team was allowed to use inside the church. Due to regulations, the project could only bring in small portable gear and could not even use a ladder or tripod. A final issue was created from the floor repaving work that allowed the team to carry out the project in the first place. Although repaving of many sections of the Holy Sepulchre only began in 2022, work in the Chapel of St. Helena was started in 2018. It was during these repairs that the team was allowed into the site. However, the repairs also generated a great deal of dust, which not only made breathing difficult but also caused problems for the team’s cameras.
Excavating Holy Sites—The Solution
Despite these challenges, the team was still able to proceed and take photographs of a large section of the wall. The most effective way to create three-dimensional models of the chapel would have been to take numerous high-resolution images of the entire wall. However, due to space limitations, the team decided to photograph the wall brick by brick. For this, the team used advanced digital cameras as well as a small LED light. The various images were later stitched together digitally into a composite map using three separate techniques: photogrammetry, reflectance transformation imaging, and gigapixel photography. Although the limitations put on the team did reduce the accuracy of the work, they were still able to overcome these challenges and a peer-reviewed article detailing their results is expected in late 2022.
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