Validation of Geodetic Seafloor Benchmark Stability Using Structure‐From‐Motion and Seafloor Pressure Data

Cook, Matthew; DeSanto, J. B.

doi:10.1029/2019ea000623

Cited by 4 publications

(1 citation statement)

References 21 publications

(23 reference statements)

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“…The MPR surveys were also compared to structure-from-motion (SfM) photogrammetry as a possible alternative to monitoring benchmark stability. However, height measurements derived from SfM models were less accurate than the MPR surveys and thus inadequate for monitoring at the cm and sub-cm level scale for geodesy (Cook & DeSanto, 2019). The limitations were primarily due to the difficulty seawater imposes and the limited resolution of typical ROV cameras, but advances in cameras and refined methodology could allow cm-scale benchmark monitoring.…”

Section: A2 Additional Geodetic Monumentation For Testing Benchmark S...mentioning

confidence: 99%

Calibrated Absolute Seafloor Pressure Measurements for Geodesy in Cascadia

et al. 2023

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The boundary between the overriding and subducting plates is locked along some portions of the Cascadia subduction zone. The extent and location of locking affects the potential size and frequency of great earthquakes in the region. Because much of the boundary is offshore, measurements on land are incapable of completely defining a locked zone in the up‐dip region. Deformation models indicate that a record of seafloor height changes on the accretionary prism can reveal the extent of locking. To detect such changes, we have initiated a series of calibrated pressure measurements using an absolute self‐calibrating pressure recorder. A piston‐gauge calibrator under careful metrological considerations produces an absolutely known reference pressure to correct seafloor pressure observations to an absolute value. We report an accuracy of about 25 ppm of the water depth, or 0.02 kPa (0.2 cm equivalent) at 100 m to 0.8 kPa (8 cm equivalent) at 3,000 m. These campaign survey‐style absolute pressure measurements on seven offshore benchmarks in a line extending 100 km westward from Newport, Oregon from 2014 to 2017 establish a long‐term, sensor‐independent time series that can, over decades, reveal the extent of vertical deformation and thus the extent of plate locking and place initial limits on rates of subsidence or uplift. Continued surveys spanning years could serve as calibration values for co‐located or nearby continuous pressure records and provide useful information on possible crustal deformation rates, while epoch measurements spanning decades would provide further limits and additional insights on deformation.

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Section: A2 Additional Geodetic Monumentation For Testing Benchmark S...mentioning

confidence: 99%

Calibrated Absolute Seafloor Pressure Measurements for Geodesy in Cascadia

et al. 2023

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Validation of Geodetic Seafloor Benchmark Stability Using Structure‐From‐Motion and Seafloor Pressure Data

Cook

DeSanto

2019

Earth and Space Science

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One commonly used method to measure and detect centimeter‐scale changes on land is structure‐from‐motion (SfM) photogrammetry, wherein sets of digital images are used to generate three‐dimensional spatial models. Subcentimeter accuracy useful for geodetic studies is achievable when these surveys are conducted on land or from the air. This method has made its way into marine environments by way of scuba, remotely operated vehicle, and autonomous underwater vehicle‐based surveys largely in the context of mapping. Repeated SfM photogrammetry surveys could be used to monitor changes in the stability of seafloor benchmarks and key sites as the interest in and need for marine geodetic measurements continues to grow. These studies require centimeter‐level accuracy or better, and some rely on accurate placement, positioning, or relocation of geodetic monuments, benchmarks, and instruments. We assessed the accuracy of the photogrammetric method for this purpose by simultaneously conducting a remotely operated vehicle‐based SfM photo survey to produce three‐dimensional spatial data, and a precise pressure survey to accurately measure height information. We found that the SfM survey agreed with the pressure survey height within its uncertainty of ±6.0 cm while using a standard, off‐the‐shelf camera adapted for underwater use. This level of relative accuracy would allow us to detect changes in geodetic benchmarks or instrumented sites between repeated surveys where large changes or the accumulation of small changes is expected within the scene over several years. We believe that centimeter‐level accuracy is obtainable with adjustments to the photogrammetry survey parameters, a higher‐resolution camera, and inclusion of additional coded targets.

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The integration of 3D technology for the conservation and restoration of ruined archaeological artifacts

Simou

Baba

Nounah

2022

Hist. sci. technol.

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The restoration and conservation of monuments and archaeological sites is a delicate operation. It requires fidelity, delicacy, precision and archaeological authenticity. The aim is to reveal, recreate as accurately as possible the characteristics of an archaeological site or part of it. Research during the last two decades has proved that 3D modeling, or the digital documentation and visualization of archaeological objects in 3D, is valuable for archaeological research. As well, as for conservation and presentation to a wide audience, as it allows the creation of realistic and accurate digital copies of archaeological objects. In the past, 3D modeling technologies were prohibitively expensive and too technologically specialized to be integrated into most historical heritage projects. However, advancements in computing and digital photography over the past decade have resulted in several low-cost, user-friendly options for 3D modeling, using photogrammetry. The latter has been used successfully for documentation of historic cultural. In recent years, this technology has become increasingly more popular for archiving, which provide the 3D model and digital ortho-image using high accuracy dense 3D points. The study has opted for the technique of terrestrial and aerial photogrammetry by 3D surveys of architectural elements, to develop an archetype of the deteriorated Islamic Marinid site (a dynasty between the 13th and 15th centuries), and the Roman site (25 BC), located at the Chellah archaeological site in Rabat and Salé cities. However, the recognition of the importance of these Islamic sites, in terms of the evolution of Moroccan Islamic art, requires the combination of large-scale scanning capability of unmanned terrestrial, aerial photogrammetry and the photorealistic rendering of 3D, as well as exhaustive research on the history of this cultural site. The data acquired build an architectural database to archive and retrieve the entire existing architecture of monuments. This study has been completed by photogrammetrists, architects, and restorers.

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Validation of Geodetic Seafloor Benchmark Stability Using Structure‐From‐Motion and Seafloor Pressure Data

Cited by 4 publications

References 21 publications

Calibrated Absolute Seafloor Pressure Measurements for Geodesy in Cascadia

Calibrated Absolute Seafloor Pressure Measurements for Geodesy in Cascadia

Validation of Geodetic Seafloor Benchmark Stability Using Structure‐From‐Motion and Seafloor Pressure Data

The integration of 3D technology for the conservation and restoration of ruined archaeological artifacts

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