Multi-azimuth 3D Model Building and Azimuthally Anisotropic PSDM for Land Data Processing

2014 ◽  
Author(s):  
H.J. Zhang ◽  
M. Yu ◽  
Y. Yang ◽  
J.X. Zhao ◽  
Y. Fang
Keyword(s):  
Data Processing ◽  
3D Model ◽  
Model Building

scholarly journals Preparation of 2D sequences of corneal images for 3D model building

2014 ◽  
Vol 114 (2) ◽  
pp. 194-205 ◽  
Author(s):  
Abdulhakim Elbita ◽  
Rami Qahwaji ◽  
Stanley Ipson ◽  
Mhd Saeed Sharif ◽  
Faruque Ghanchi
Keyword(s):  
3D Model ◽  
Model Building

scholarly journals Cultural Heritage: An example of graphical documentation with automated photogrammetric systems

2014 ◽  
Vol XL-5 ◽  
pp. 251-255 ◽  
Author(s):  
M. G. Giuliano
Keyword(s):  
Data Processing ◽  
Cultural Heritage ◽  
Data Acquisition ◽  
Camera Calibration ◽  
Structure From Motion ◽  
3D Model ◽  
Digital Camera ◽  
Total Station ◽  
Image Based Modeling ◽  
South West

In the field of Cultural Heritage, the use of automated photogrammetric systems, based on <i>Structure from Motion</i> techniques (SfM), is widely used, in particular for the study and for the documentation of the ancient ruins. This work has been carried out during the PhD cycle that was produced the "Carta Archeologica del territorio intorno al monte Massico". The study suggests the archeological documentation of the mausoleum "Torre del Ballerino" placed in the south-west area of Falciano del Massico, along the Via Appia. The graphic documentation has been achieved by using photogrammetric system (Image Based Modeling) and by the classical survey with total station, Nikon Nivo C. The data acquisition was carried out through digital camera <i>Canon EOS 5D Mark II with Canon EF 17&ndash;40 mm f/4L USM @ 20 mm</i> with images snapped in RAW and corrected in <i>Adobe Lightroom</i>. During the data processing, the camera calibration and orientation was carried out by the software Agisoft Photoscans and the final result has allowed to achieve a scaled 3D model of the monument, imported in software <i>MeshLab</i> for the different view. Three orthophotos in <i>jpg</i> format were extracted by the model, and then were imported in AutoCAD obtaining façade’s surveys.

scholarly journals 3D MODEL GENERATION FROM UAV: HISTORICAL MOSQUE (MASJID LAMA NILAI)

2017 ◽  
Vol XLII-2/W6 ◽  
pp. 251-255
Author(s):  
N. H. Mohd Nasir ◽  
K. N. Tahar
Keyword(s):  
Unmanned Aerial Vehicle ◽  
3D Model ◽  
Model Building ◽  
Accuracy Assessment ◽  
Building Technology ◽  
Structural Problems ◽  
Time To Build ◽  
Aerial Vehicle ◽  
D Model ◽  
Accurate Record

Preserving cultural heritage and historic sites is an important issue. These sites are subjected to erosion and vandalism, and, as long-lived artifacts, they have gone through many phases of construction, damage and repair. It is important to keep an accurate record of these sites using the 3-D model building technology as they currently are, so that preservationists can track changes, foresee structural problems, and allow a wider audience to “virtually” see and tour these sites. Due to the complexity of these sites, building 3-D models is time consuming and difficult, usually involving much manual effort. This study discusses new methods that can reduce the time to build a model using the Unmanned Aerial Vehicle method. This study aims to develop a 3D model of a historical mosque using UAV photogrammetry. In order to achieve this, the data acquisition set of Masjid Lama Nilai, Negeri Sembilan was captured by using an Unmanned Aerial Vehicle. In addition, accuracy assessment between the actual and measured values is made. Besides that, a comparison between the rendering 3D model and texturing 3D model is also carried out through this study.

3D Reconstruction Optimization Algorithm Based on Dynamic Clustering in Transformer Substation

2017 ◽  
Vol 14 (1) ◽  
pp. 248-251
Author(s):  
Xuesong Suo ◽  
Chenwei Hou ◽  
Lei Sun ◽  
Zi Liu
Keyword(s):  
Clustering Algorithm ◽  
3D Model ◽  
Model Building ◽  
Reconstruction Algorithm ◽  
Cluster Center ◽  
Dynamic Clustering ◽  
Dynamic Cluster ◽  
Model Library ◽  
Transformer Substation ◽  
Different Shapes

The visual substation model construction is paid more and more attention. In order to build the substation 3D model without increasing the workload, researchers in related fields often make 3D modeling by transforming the 2D images into 3D model. This paper proposes a reconstruction algorithm based on dynamic clustering algorithm which is used in reconstruction of transformer substation. According to this method, a dynamic cluster center array can be established, and the different shapes of the same device can be divided, and the information can be extracted and matched with the 3D model library to complete the 3D model building. The verification results show that the proposed method has higher precision and recall. At last this paper gives a simple example and a complicated example to verify the validity of the method.

scholarly journals Photogrammetric 3D Model via Smartphone GNSS Sensor: Workflow, Error Estimate, and Best Practices

2020 ◽  
Vol 12 (21) ◽  
pp. 3616
Author(s):  
Stefano Tavani ◽  
Antonio Pignalosa ◽  
Amerigo Corradetti ◽  
Marco Mercuri ◽  
Luca Smeraglia ◽  
...  
Keyword(s):  
3D Model ◽  
Model Building ◽  
Satellite System ◽  
Test Case ◽  
Digital Terrain ◽  
Ground Control Points ◽  
Terrain Models ◽  
Aerial Vehicle ◽  
Global Navigation Satellite ◽  
The Impact

Geotagged smartphone photos can be employed to build digital terrain models using structure from motion-multiview stereo (SfM-MVS) photogrammetry. Accelerometer, magnetometer, and gyroscope sensors integrated within consumer-grade smartphones can be used to record the orientation of images, which can be combined with location information provided by inbuilt global navigation satellite system (GNSS) sensors to geo-register the SfM-MVS model. The accuracy of these sensors is, however, highly variable. In this work, we use a 200 m-wide natural rocky cliff as a test case to evaluate the impact of consumer-grade smartphone GNSS sensor accuracy on the registration of SfM-MVS models. We built a high-resolution 3D model of the cliff, using an unmanned aerial vehicle (UAV) for image acquisition and ground control points (GCPs) located using a differential GNSS survey for georeferencing. This 3D model provides the benchmark against which terrestrial SfM-MVS photogrammetry models, built using smartphone images and registered using built-in accelerometer/gyroscope and GNSS sensors, are compared. Results show that satisfactory post-processing registrations of the smartphone models can be attained, requiring: (1) wide acquisition areas (scaling with GNSS error) and (2) the progressive removal of misaligned images, via an iterative process of model building and error estimation.

In-house high-energy-remote SAD phasing using the magic triangle: how to tackle the P1 low symmetry using multiple orientations of the same crystal of human IBA57 to increase the multiplicity

2019 ◽  
Vol 75 (3) ◽  
pp. 317-324 ◽  
Author(s):  
Spyridon Gourdoupis ◽  
Veronica Nasta ◽  
Simone Ciofi-Baffoni ◽  
Lucia Banci ◽  
Vito Calderone
Keyword(s):  
Data Processing ◽  
Model Building ◽  
Real Data ◽  
Threshold Value ◽  
High Energy ◽  
Software Developers ◽  
Data Set ◽  
Structure Solution ◽  
Sad Phasing ◽  
Low Symmetry

This article describes the approach used to solve the structure of human IBA57 in-house by 5-amino-2,4,6-triiodoisophthalic acid (I3C) high-energy-remote single-wavelength anomalous dispersion (SAD) phasing. Multiple orientations of the same triclinic crystal were exploited to acquire sufficient real data multiplicity for phasing. How the collection of an in-house native data set and its joint use with the I3C derivative through a SIRAS approach decreases the data multiplicity needed by almost 50% is described. Furthermore, it is illustrated that there is a clear data-multiplicity threshold value for success and failure in phasing, and how adding further data does not significantly affect substructure solution and model building. To our knowledge, this is the only structure present in the PDB that has been solved in-house by remote SAD phasing in space group P1 using only one crystal. All of the raw data used, derived from the different orientations, have been uploaded to Zenodo in order to enable software developers to improve methods for data processing and structure solution, and for educational purposes.

3D-model building of the jaw impression

1997 ◽  
Author(s):  
Moumen T. Ahmed ◽  
Sameh M. Yamany ◽  
Elsayed E. Hemayed ◽  
Aly A. Farag
Keyword(s):  
3D Model ◽  
Model Building
Sign in / Sign up

Export Citation Format

Share Document