scholarly journals From photo-geology to 3D geological models. An open source approach

2016 ◽  
Author(s):  
Michele Santangelo ◽  
Ivan Marchesini ◽  
Francesco Mirabella ◽  
Francesco Bucci ◽  
Mauro Cardinali ◽  
...  
Keyword(s):  
Open Source ◽  
Central Italy ◽  
Three Dimensional ◽  
3D Models ◽  
Geological Mapping ◽  
Aerial Photographs ◽  
Preliminary Evaluation ◽  
Three Dimensional Modeling ◽  
Geological Models ◽  
Open Source Gis

Three-dimensional modeling of geological bodies is a useful tool for multiple applications. Such tasks are usually accomplished starting from field-collected data, which typically suffer from intrinsic limitations such as accessibility constraints and punctuality of data collected. In this work, we explore the reliability of photo-geological mapping from interpretation of aerial photographs in providing data useful to build up 3D geological models. The test was conducted in a 15 km2 in Umbria, central Italy. The three-steps open source GIS procedure that outputs 3D models from photo-geological data was developed using python in GRASS GIS environment and GNU-Linux OS. We maintain that this procedure can have potential broad applications in Earth Sciences, including geological and structural analyses, up to the preliminary evaluation of potential reservoirs.

scholarly journals From photo-geology to 3D geological models. An open source approach

2016 ◽  
Author(s):  
Michele Santangelo ◽  
Ivan Marchesini ◽  
Francesco Mirabella ◽  
Francesco Bucci ◽  
Mauro Cardinali ◽  
...  
Keyword(s):  
Open Source ◽  
Central Italy ◽  
Three Dimensional ◽  
3D Models ◽  
Geological Mapping ◽  
Aerial Photographs ◽  
Preliminary Evaluation ◽  
Three Dimensional Modeling ◽  
Geological Models ◽  
Open Source Gis

Three-dimensional modeling of geological bodies is a useful tool for multiple applications. Such tasks are usually accomplished starting from field-collected data, which typically suffer from intrinsic limitations such as accessibility constraints and punctuality of data collected. In this work, we explore the reliability of photo-geological mapping from interpretation of aerial photographs in providing data useful to build up 3D geological models. The test was conducted in a 15 km2 in Umbria, central Italy. The three-steps open source GIS procedure that outputs 3D models from photo-geological data was developed using python in GRASS GIS environment and GNU-Linux OS. We maintain that this procedure can have potential broad applications in Earth Sciences, including geological and structural analyses, up to the preliminary evaluation of potential reservoirs.

scholarly journals From photo-geology to 3D geological models. An open source approach

2016 ◽  
Author(s):  
Michele Santangelo ◽  
Ivan Marchesini ◽  
Francesco Mirabella ◽  
Francesco Bucci ◽  
Mauro Cardinali ◽  
...  
Keyword(s):  
Open Source ◽  
Central Italy ◽  
Three Dimensional ◽  
3D Models ◽  
Preliminary Evaluation ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Geological Models ◽  
Open Source Gis ◽  
Gis Environment

Three-dimensional modeling of geological bodies is a useful tool for multiple applications. Such tasks are usually accomplished starting from field-collected data, which typically suffer from intrinsic limitations such as accessibility constraints and punctuality of data collected. In this work, we explore the reliability of photo-geological analyses starting from aerial photo-interpretation in providing data useful to build up 3D geological models, and validate them using exploration wells data in a lignite rich area in Umbria, central Italy. The procedure that produces 3D models from photo-geological data is a three-step open source GIS procedure developed using python in GRASS GIS environment and GNU-Linux OS. We maintain that this procedure can have potential broad applications in Earth Sciences, including geological and structural analyses, up to the preliminary evaluation of potential reservoirs.

scholarly journals Processing Three-Dimensional Models of Archaeological Artifacts

2021 ◽  
Vol 20 (7) ◽  
pp. 48-61
Author(s):  
Pavel V. Chistyakov ◽  
Ekaterina N. Bocharova ◽  
Ksenia A. Kolobova
Keyword(s):  
Three Dimensional ◽  
3D Models ◽  
International Standards ◽  
Post Processing ◽  
Three Dimensional Model ◽  
Scaled Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Dimensional Models ◽  
Three Dimensional Models

This article provides a detailed account of the process of scanning, post-processing and further manipulation of three-dimensional models obtained with structured light scanners. Purpose. The purpose of the study is determined by the need for national archaeologists to learn the methods of three-dimensional modeling for the implementation of scientific research corresponding to international standards. Unfortunately, this direction in national archaeology began to develop in a relatively recent time and there is a lag in the application of three-dimensional modeling of national archaeology compared to the world level. Results. Any archaeological, experimental or ethnographic artifact can be used for three-dimensional scanning. To perform post-processing of three-dimensional models it is necessary to carry out primary scanning of an artifact by one of the existing algorithms. The algorithm for creating models, their positioning, simplification, saving in various formats and export is described. The main sequence of 3D models post-processing includes: processing of groups of scanned projections (their cleaning and alignment), creation of artifact model and processing/rectification of the resulting model using special software. Conclusion. As a result of correct implementation of the algorithm, the researcher receives a scaled model completely corresponding to the original artifact. Obtaining a scalable, texture-free three-dimensional model of the artifact, which fully corresponds to the original and exceeds a photograph in the quality of detail transfer, allows a scientist to conduct precise metric measurements and any procedures of non-invasive manipulation of the models. The ability to access a database of three-dimensional models of archaeological collections greatly simplifies the work of archaeologists, especially in situations when country borders are closed.

Three Dimensional Modeling of Buildings Using Three Dimensional Laser Scanning Data

2012 ◽  
Vol 594-597 ◽  
pp. 2398-2401
Author(s):  
Dong Ling Ma ◽  
Jian Cui ◽  
Fei Cai
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
3D Visualization ◽  
Cloud Model ◽  
Three Dimensional ◽  
3D Models ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Feature Lines ◽  
Point Cloud Model

This paper provides a scheme to construct three dimensional (3D) model fast using laser scanning data. In the approach, firstly, laser point cloud are scanned from different scan positions and the point cloud coming from neighbor scan stations are spliced automatically to combine a uniform point cloud model, and then feature lines are extracted through the point cloud, and the framework of the building are extracted to generate 3D models. At last, a conclusion can be drawn that 3D visualization model can be generated quickly using 3D laser scanning technology. The experiment result shows that it will bring the application model and technical advantage which traditional mapping way can not have.

Conceptual Three-Dimensional Modeling Using Intuitive Gesture-Based Midair Three-Dimensional Sketching Technique

2018 ◽  
Vol 18 (4) ◽  
Author(s):  
Jinmiao Huang ◽  
Rahul Rai
Keyword(s):  
User Study ◽  
Low Cost ◽  
Three Dimensional ◽  
3D Models ◽  
Interaction Technique ◽  
Three Dimensional Modeling ◽  
Study Results ◽  
Novice Users ◽  
Technical Solutions ◽  
3D Shapes

We introduce an intuitive gesture-based interaction technique for creating and manipulating simple three-dimensional (3D) shapes. Specifically, the developed interface utilizes low-cost depth camera to capture user's hand gesture as the input, maps different gestures to system commands and generates 3D models from midair 3D sketches (as opposed to traditional two-dimensional (2D) sketches). Our primary contribution is in the development of an intuitive gesture-based interface that enables novice users to rapidly construct conceptual 3D models. Our development extends current works by proposing both design and technical solutions to the challenges of the gestural modeling interface for conceptual 3D shapes. The preliminary user study results suggest that the developed framework is intuitive to use and able to create a variety of 3D conceptual models.

scholarly journals How to circumvent the limitations of open source software and orthorectify how (or better) than with commercial software

2020 ◽  
Author(s):  
Valerio Baiocchi ◽  
Roberta Onori ◽  
Felicia Monti ◽  
Francesca Giannone
Keyword(s):  
Open Source ◽  
Satellite Images ◽  
Research Work ◽  
Three Dimensional ◽  
Commercial Software ◽  
Whole Process ◽  
High Resolution Satellite Images ◽  
Open Source Gis ◽  
Gis Software ◽  
Better Than

<p>High and very high resolution satellite images are now an irreplaceable resource for earth observation in general and for the extraction of hydrogeological information in particular. In order to use them correctly and compare them with previous surveys and maps, they must be treated geometrically to remove the distortions introduced by the acquisition process. Orthorectification is not a simple georeferencing because the process must take into account the three-dimensional acquisition geometry of the sensor. For this reason orthorectification must be performed within specific commercial software with additional costs compared to image acquisition which, in some cases, is currently free of charge.<br>Some orthorectification algorithms, mainly based on the RPC approach, are available in open source GIS software such as QGIS. OTB (Orpheus toolbox) for QGIS contains some of these algorithms but its interfaces are not clear and there are some incomprehensible limitations such as the impossibility to input three-dimensional ground control points (GCPs). This severely limits the final achievable accuracy because it does not allow to correctly estimate the influence of different ground morphologies on the acquisition geometry. To get around these limitations you can make a "pseudo DEM" and other expedients to complete the whole process obtaining absolute results comparable if not better than those of commercial software.<br>The proposed procedure may not be the fastest but it can be a valid alternative for those who use satellite images as a tool in their research work.</p><p> </p>

scholarly journals FaReT: A free and open-source toolkit of three-dimensional models and software to study face perception

2019 ◽  
Author(s):  
Jason Scott Hays ◽  
Claudia Wong ◽  
Fabian Soto
Keyword(s):  
Open Source ◽  
Face Perception ◽  
Three Dimensional ◽  
3D Models ◽  
Face Modeling ◽  
3D Face Modeling ◽  
The Face ◽  
Face Stimuli ◽  
Three Dimensional Models ◽  
Model Database

A problem in the study of face perception is that results can be confounded by poor stimulus control. Ideally, experiments should precisely manipulate facial features under study and tightly control irrelevant features. Software for 3D face modeling provides such control, but there is a lack of free and open source alternatives specifically created for face perception research. Here, we provide such tools by expanding the open-source software MakeHuman. We present a database of 27 identity models and 6 expression pose models (sadness, anger, happiness, disgust, fear, and surprise), together with software to manipulate the models in ways that are common in the face perception literature, allowing researchers to: (1) create a sequence of renders from interpolations between two or more 3D models (differing in identity, expression, and/or pose), resulting in a “morphing” sequence; (2) create renders by extrapolation in a direction of face space, obtaining 3D “anti-faces” and caricatures; (3) obtain videos of dynamic faces from rendered images; (4) obtain average face models; (5) standardize a set of models so that they differ only in selected facial shape features, and (6) communicate with experiment software (e.g., PsychoPy) to render faces dynamically online. These tools vastly improve both the speed at which face stimuli can be produced and the level of control that researchers have over face stimuli. We validate the face model database and software tools through a small study on human perceptual judgments of stimuli produced with the toolkit.

scholarly journals СТВОРЕННЯ ПАРАМЕТРИЧНОЇ МОДЕЛІ ПОВЕРХНІ ТРИКОТАЖУ ПЕРЕПЛЕТЕННЯ ЛАСТИК 2x2

2020 ◽  
Vol 144 (2) ◽  
pp. 80-89
Author(s):  
Т. В. Єліна ◽  
Л. Є. Галавська ◽  
О. П. Манойленко
Keyword(s):  
Mechanical Characteristics ◽  
Three Dimensional ◽  
3D Models ◽  
Air Permeability ◽  
Parametric Models ◽  
Detailed Structure ◽  
Geometrical Characteristics ◽  
Three Dimensional Modeling ◽  
Fabric Surface ◽  
Physical And Mechanical Characteristics

This study aims to develop an algorithm for constructing surface models (macro-models) of rib knitted structures, for three-dimensional modeling of tensile deformations in coursewise direction and predicting the physical and mechanical characteristics of knitted fabrics and products. During the research, methods of theoretical analysis, spline theory, computer graphics, programming tools have been used. As a result of the research, it was found that for modeling of some physical and mechanical characteristics of knitted rib structures in a deformed state, it is advisable to use geometric models that reproduce the geometry of the knitted fabric surface with high accuracy, but do not have detailed structure at the level of fibers and threads. If necessary, the values of air permeability, thermal conductivity and others porosity for such models can be taken into account under the form of appropriate indexes. At the same time, to calculate the coefficients of porosity and air permeability, one can use both experimental data and 3D models with a higher detailed structure of the textile material (meso-model). In the course of research a set of geometrical characteristics of samples of rib knits patterns is formed. Samples of 2x2 rib knits of PAN yarn of 31х2 tex have been made with a flat bed knitting machine of 10th gauge. The samples were suspended in the clamps of the relaxometer type "rack" and loaded with weights weighing from 20 to 120 g with an interval of 20 g. By means of the camera, the geometrical characteristics of the knitted surface in dry-relaxed state and in 6 discrete tensile states were recorded and determined. According to the obtained data, parametric 3D models of the knitted surface were built. An algorithm for constructing a macromodel of knitted rib 2x2 structure in the process of stretching in the coursewise direction, taking into account the peculiarities of the situational change in the geometry of the thread within the report has been developed. Three-dimensional parametric models of knitted surface (macro-models) of knitted 2x2 rib structures in the Autodesk Inventor environment have been created.

scholarly journals Rapid Method for Electron Tomographic Reconstruction and Three-Dimensional Modeling of the Murine Synapse Using an Automated Fiducial Marker-Free System

2013 ◽  
Vol 19 (S5) ◽  
pp. 182-187 ◽  
Author(s):  
Hyun-wook Kim ◽  
Seung Hak Oh ◽  
Namkug Kim ◽  
Eiko Nakazawa ◽  
Im Joo Rhyu
Keyword(s):  
Electron Tomography ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3D Models ◽  
Three Dimension ◽  
Synaptic Organization ◽  
Back Projection ◽  
Virtual Image ◽  
Free System ◽  
Three Dimensional Modeling

AbstractElectron tomography (ET) has recently afforded new insights into neuronal architecture. However, the tedious process of sample preparation, image acquisition, alignment, back projection, and additional segmentation process of ET repels beginners. We have tried Hitachi's commercial packages integrated with a Hitachi H-7650 TEM to examine the potential of using an automated fiducial-less approach for our own neuroscience research. Semi-thick sections (200–300 nm) were cut from blocks of fixed mouse (C57BL) cerebellum and prepared for ET. Sets of images were collected automatically as each section was tilted by 2° increments (±60°). “Virtual” image volumes were computationally reconstructed in three dimension (3D) with the EMIP software using either the commonly used “weighted back-projection” (WBP) method or “topography-based reconstruction” (TBR) algorithm for comparison. Computed tomograms using the TBR were more precisely reconstructed compared with the WBP method. Following reconstruction, the image volumes were imported into the 3D editing software A-View and segmented according to synaptic organization. The detailed synaptic components were revealed by very thin virtual image slices; 3D models of synapse structure could be constructed efficiently. Overall, this simplified system provided us with a graspable tool for pursuing ET studies in neuroscience.

3D-modeling in forensic medicine: a tutorial

2019 ◽  
Author(s):  
Yuliya Shakiryanova ◽  
Sergey Leonov ◽  
Daniil Korabelnikov
Keyword(s):  
Forensic Medicine ◽  
Three Dimensional ◽  
3D Models ◽  
Digital Photographs ◽  
Three Dimensional Modeling ◽  
Modern Computer ◽  
Video Frames ◽  
Dimensional Models ◽  
Step Algorithm ◽  
Three Dimensional Models

The tutorial provides an overview of the main methods of creating three-dimensional (3D) models of objects and their applications. A step-by-step algorithm for creating virtual copies of objects based on digital photos and video frames using modern computer programs "AgisoftPhotoscan" and "ContextCapture" is described. Details of the necessary conditions for obtaining high-quality digital photos and models, especially the process of photography, the requirements for the resulting digital photos. Recommendations are given for obtaining digital photographs suitable for creating three-dimensional models in various fields of research. The theoretical foundations of the method of creating three-dimensional models using digital photographs are described in detail, the basic concepts used in three-dimensional modeling are defined. The areas of application of three-dimensional models in forensic medicine, as well as problems that can be solved with the help of the created models are determined. Established criteria, which may affect the accuracy of the models, the reproduction of the qualitative and quantitative characteristics of the research object. Illustrative examples from their own practice.

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