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12 results for “Close-range photogrammetry”
Application of Close-Range SfM Photogrammetry on three bases of Etruscan Bronze Candelabra from Spina Necropolises
<p>Application of Close-Range SfM Photogrammetry on three bases of Etruscan Bronze Candelabra from Spina Necropolises. </p> <p>This dataset contains the photogrammetry made 3D models of three Etruscan Bronze Candelabra found at Spina, dated to the 4th cent. BC, kept in the Archaeological Museum of Ferrara.</p> <p>The models were made through Agisoft Metashape from previously taken RAW photos, at the National Archaeological Museum of Ferrara, for master thesis purposes. Some minor issues of the meshes were solved using Blender before texturing the models.</p> <p>The folders are divided according to the tombs of provenance of the candelabra (T. 545, T. 1122, T. Unknown) and every folder contain:</p> <ul> <li>The OBJ</li> <li>The texture</li> <li>An additional folder with the reports generated from Agisoft Metashape</li> </ul>
FIGURE 8. Molfetta dinosaur tracks, photogrammetry derived 3D in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 8. Molfetta dinosaur tracks, photogrammetry derived 3D models and interpretations; 1-2, DEM and contour line map of a theropod footprint (contour lines have an interval of 0.2 cm); 4-5, DEM and contour line map of an ornitischian footprint; 3 and 6, interpretative outline drawings of the studied tracks.
FIGURE 7 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 7. Orthophotomosaic of the Molfetta tracksite produced by the aerial survey performed with the hexacopter.
FIGURE 6 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 6. Comparison of the products generated for the sector including the "L-shaped trace". 1, orthophoto raster map; 2, hillshade raster map; 3, slope raster map; 4, contour lines vector map.
FIGURE 4 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 4. Comparison of the results obtained on a sample area. 1, orthophoto; 2, DEM; 3, slope raster map produced by the quadcopter at flight height of 30 m; 4, orthophoto; 5, DEM; 6, slope raster map produced by the quadcopter at a flight height of 10 m; 7, orthophoto; 8, DEM; 9, slope raster map produced by the hexacopter at a flight height of 15 m.
FIGURE 3 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 3. The UAVs (Unmanned Aerial Vehicles) used for aerial survey of the tracksite. 1, quadcopter SZ DJI Phantom 4; 2, hexacopter Tarot FY680 Pro.
FIGURE 5 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 5. Comparison of the products generated for one of the most trampled sector. 1, orthophoto raster map; 2, hillshade raster map; 3, slope raster map; 4, contour lines vector map.
FIGURE 1 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 1. Locality map showing the San Leonardo quarry tracksite, Apulia, southern Italy. Image obtained using Google Earth Pro.
FIGURE 2 in The use of aerial and close-range photogrammetry in the study of dinosaur tracksites: Lower Cretaceous (upper Aptian/lower Albian) Molfetta ichnosite (Apulia, southern Italy)
FIGURE 2. Molfetta tracksite - Map of the trampled surface.
Raw Data Examples for Close-Range Photogrammetry of Replicative Experiments on Ground Stone Tools
<p>The data presented in this study pertains to the experimental collection built to verify the applicability of close-range photogrammetry to ground stone tools (GSTs).</p> <p>GS17 is a sandstone slab collected from the Fiora River in Manciano, Italy, where sandstone of Miocene formation outcrops. This stone is primarily composed of quartz grains embedded in abundant carbonate cement. It was utilized as a GST in replicative experiments, paired with an active tool from the same provenience, and subjected to 2 hours of<em> Rumex crispus</em> achenes grinding. Photogrammetric techniques based on Structure-from-Motion and Multi-View Stereo reconstruction were employed to generate the 3D models of the tool at different stages of the replicative use. We recorded the geometry of the GST before (referred to as T<sub>0</sub>) and after use (T<sub>4</sub>) to later compare and assess the change in object geometry during the transformation of vegetal resources, thereby facilitating our understanding of archaeological tools.</p> <p>This dataset comprises the pictures required for the elaboration of the GS17 models at T<sub>0</sub> and T<sub>4</sub>, as well as the data necessary for calibration.</p>
Supplementary 1: Underwater photogrammetry for close-range 3D imaging of dry-sensitive objects: The case study of cephalopod beaks
<ul> <li>Technical advances in 3D imaging have contributed to quantifying and understanding biological variability and complexity. However, small, dry-sensitive objects are not easy to reconstruct using common and easily available techniques such as photogrammetry, surface scanning, or micro-CT scanning. Here we use cephalopod beaks as an example as their size, thickness, transparency, and dry-sensitive nature make them particularly challenging. We developed a new, underwater, photogrammetry protocol in order to add these types of biological structures to the panel of photogrammetric possibilities.</li> <li>We used a camera with a macro-photography mode in a waterproof housing fixed in a tank with clear water. The beak was painted and fixed on a colored rotating support. Three angles of view, two acquisitions, and around 300 pictures per specimen were taken in order to reconstruct a full 3D-model. These models were compared to others obtained with micro-CT scanning to verify their accuracy.</li> <li>The models can be obtained quickly and cheaply compared to micro-CT scanning, and have sufficient precision for quantitative inter-specific morphological analyses. Our work shows that underwater photogrammetry is a fast, non-invasive, efficient, and accurate way to reconstruct 3D models of dry-sensitive objects while conserving their shape. While the reconstruction of the shape is accurate, some internal parts cannot be reconstructed with photogrammetry as they are not visible. In contrast, these structures are visible using reconstructions based on micro-CT scanning. The mean difference between both methods is very small (10<sup>-5</sup> to 10<sup>-4</sup> mm) and is significantly lower than differences between meshes of different individuals.</li> <li>This photogrammetry protocol is portable, easy-to-use, fast, and reproducible. Micro-CT scanning, in contrast, is time-consuming, expensive and non-portable. This protocol can be applied to reconstruct the 3D shape of many other dry-sensitive objects such as shells of shellfish, cartilage, plants and other chitinous materials.</li> </ul>
Supplementary 1: Underwater photogrammetry for close-range 3D imaging of dry-sensitive objects: The case study of cephalopod beaks
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