scholarly journals PRELIMINARY EVALUATION OF A COMMERCIAL 360 MULTI-CAMERA RIG FOR PHOTOGRAMMETRIC PURPOSES

2018 ◽  
Vol XLII-2 ◽  
pp. 1113-1120 ◽  
Author(s):  
L. Teppati Losè ◽  
F. Chiabrando ◽  
A. Spanò
Keyword(s):  
Point Of View ◽  
Preliminary Evaluation ◽  
Theoretical Point ◽  
Control Points ◽  
Spherical Image ◽  
Spherical Images ◽  
And Control ◽  
Orientation Parameters ◽  
Spherical Panorama

The research presented in this paper is focused on a preliminary evaluation of a 360 multi-camera rig: the possibilities to use the images acquired by the system in a photogrammetric workflow and for the creation of spherical images are investigated and different tests and analyses are reported. Particular attention is dedicated to different operative approaches for the estimation of the interior orientation parameters of the cameras, both from an operative and theoretical point of view. The consistency of the six cameras that compose the 360 system was in depth analysed adopting a self-calibration approach in a commercial photogrammetric software solution. A 3D calibration field was projected and created, and several topographic measurements were performed in order to have a set of control points to enhance and control the photogrammetric process. The influence of the interior parameters of the six cameras were analyse both in the different phases of the photogrammetric workflow (reprojection errors on the single tie point, dense cloud generation, geometrical description of the surveyed object, etc.), both in the stitching of the different images into a single spherical panorama (some consideration on the influence of the camera parameters on the overall quality of the spherical image are reported also in these section).

scholarly journals Designing Control Points in UAV-Photogrammetry Mapping Using GNSS Concept to Produce Land Use Map (Case Study: Ciwidey Village, Bandung Regency, Indonesia)

2019 ◽  
Vol 94 ◽  
pp. 01020
Author(s):  
Sadikin Hendriatiningsih ◽  
Asep Y. Saptari ◽  
Sudarman ◽  
Ratri Widyastuti ◽  
Putri Rahmadani
Keyword(s):  
Observation Time ◽  
Baseline Length ◽  
Control Points ◽  
Quality Of Control ◽  
Field Situation ◽  
American Society ◽  
Time Accuracy ◽  
And Control

Production of orhtophoto maps from UAV-photogrammetry method depend on aerial data and control points that are measured by GNSS method. Quality control of orhtophoto maps need comparison coordinate from Check Points and orthophoto maps coordinate to calculate the Root Mean Square Error (RMSE). So that, quality of control points is important in aerial data processing. In this research, baseline length, observation time, measurement method, and area characteristics will be discussed based on the GNSS concept to fulfill the accuracy standard of control points from the American Society of Photogrammetry and Remote Sensing (ASPRS). The shorter baseline length, and the loner observation time, accuracy should be increase significantly, but it depends on the field situation and the accuracy required for the user. After all, the result of this research is to obtain control points design based on GNSS concept in Ciwidey Village, Bandung Regency

scholarly journals Tractable models of ecological assembly

2020 ◽  
Author(s):  
Carlos A. Serván ◽  
Stefano Allesina
Keyword(s):  
Complex Dynamics ◽  
Point Of View ◽  
Priority Effects ◽  
Stable Configuration ◽  
Theoretical Point ◽  
Ecological Communities ◽  
Top Down ◽  
Bottom Up ◽  
Coexisting Species ◽  
And Control

AbstractEcological assembly, the way natural communities form under ecological time-scales, is a fundamental and yet poorly understood process. Recent theoretical and empirical approaches to assembly consider systems in which a group of species is introduced in a new environment, and dynamics prune the system down to a sub-community of coexisting species. This “top-down” assembly approach contrasts with the well-studied “bottom-up”, or sequential, assembly, in which species from a pool enter the system one at a time, giving rise to priority effects and complex dynamics. Here we determine under which conditions the two approaches are equivalent, i.e., lead asymptotically to the same exact set of coexisting species. To achieve this result, we represent the assembly process as a network in which nodes are sub-communities and edges stand for invasions shifting the composition of the ecological community from a stable configuration to another. This abstraction makes it easy to determine which states the community can occupy, as well as highlight the potential for priority effects or cyclic species composition. We discuss how the equivalence between bottom-up and top-down assembly can advance our understanding of this challenging process from an empirical and theoretical point of view, informing the study of ecological restoration and the design and control of ecological communities.

scholarly journals Properties of nematic LC planar and smoothly-irregular waveguide structures: research in the experiment and using computer modeling

2019 ◽  
Vol 43 (6) ◽  
pp. 976-982
Author(s):  
A.A. Egorov ◽  
L.A. Sevastyanov ◽  
V.D. Shigorin ◽  
A.S. Ayriyan ◽  
E.A. Ayriyan
Keyword(s):  
Liquid Crystal ◽  
Computer Modeling ◽  
Control Systems ◽  
Point Of View ◽  
Theoretical Point ◽  
Irregular Waveguide ◽  
Integrated Optical ◽  
Lc Sensors ◽  
And Control ◽  
Experimental Researches

Nematic liquid crystal planar and smoothly-irregular waveguide structures were studied experimentally and by the computer modeling. Two types of optical smoothly-irregular waveguide structures promising for application in telecommunications and control systems are studied by numerical simulation: liquid crystal waveguides and thin film solid generalized waveguide Luneburg lens. Study of the behavior of these waveguide structures where liquid crystal layer can be used to control the properties of the entire device, of course, promising, especially since such devices are also able to perform various sensory functions when changing some external parameters, accompanied by a change in a number of their properties. It can be of interest to researchers not only in the field of the integrated optics but also in some others areas: nano-photonics, optofluidics, telecommunications, and control systems. The dependences of the attenuation coefficient (optical losses) of waveguide modes and the effective sizes (correlation radii) of quasi-stationary irregularities of the liquid-crystal layers on the linear laser radiation polarization and on the presence of pulse-periodic electric field were experimentally observed. An estimate was made of the correlation radii of liquid-crystal waveguide quasi-stationary irregularities. The obtained results are undoubtedly important for further research of waveguide liquid crystal layers, both from the theoretical point of view, and practical – in the organization and carrying out new experimental researches, for example, when developing promising integrated-optical LC sensors.

scholarly journals Environmental quality of marginal territories using comparative analysis of fluctuating asymmetry methods and determining the area of leaf damage

2020 ◽  
Vol 210 ◽  
pp. 02009
Author(s):  
Aleksander Lugovskoy ◽  
Sergey Gildenskiold ◽  
Tatjana Krylova ◽  
Nina Fomina
Keyword(s):  
Comparative Analysis ◽  
Fluctuating Asymmetry ◽  
Life Support ◽  
Point Of View ◽  
Leaf Damage ◽  
Territorial Development ◽  
Leisure Facilities ◽  
Favorable Conditions ◽  
And Control

The paper assess marginal and control territories within the Moscow Metropolitan area using a comparative analysis of fluctuating asymmetry method and determining the area of leaf damage to obtain a comprehensive assessment of the territory from the point of view of human habitation with minimal comfort parameters within the sensitivity of plants. The results of the combined analysis of two methods are obtained, which confirm the possibility of their use and the representativeness of the results obtained in assessing the comfort of the environment. The assessment of the quality of the environment in marginal territories was made by quantitative and qualitative indicators for the rational use of land resources, their involvement in economic turnover with the creation of favorable conditions for ensuring the flow of social processes of territorial development and comfortable life support of the population. It was proposed that socially-oriented infrastructure, leisure facilities, and social and cultural facilities have been formed in these territories with a sufficiently large and diverse number of types and forms of employment for the population, which should become the basis for the development of marginal territories.

scholarly journals PANORAMA IMAGE SETS FOR TERRESTRIAL PHOTOGRAMMETRIC SURVEYS

2016 ◽  
Vol III-5 ◽  
pp. 159-166 ◽  
Author(s):  
L. Piermattei ◽  
W. Karel ◽  
A. Vettore ◽  
N. Pfeifer
Keyword(s):  
Control Point ◽  
Laser Scanner ◽  
3D Models ◽  
Target Object ◽  
Point Of View ◽  
Test Field ◽  
Control Data ◽  
Projection Center ◽  
And Control

High resolution 3D models produced from photographs acquired with consumer-grade cameras are becoming increasingly common in the fields of geosciences. However, the quality of an image-based 3D model depends on the planning of the photogrammetric surveys. This means that the geometric configuration of the multi-view camera network and the control data have to be designed in accordance with the required accuracy, resolution and completeness. From a practical application point of view, a proper planning (of both photos and control data) of the photogrammetric survey especially for terrestrial acquisition, is not always ensured due to limited accessibility of the target object and the presence of occlusions. To solve these problems, we propose a different image acquisition strategy and we test different geo-referencing scenarios to deal with the practical issues of a terrestrial photogrammetric survey. The proposed photogrammetric survey procedure is based on the acquisition of a sequence of images in panorama mode by rotating the camera on a standard tripod. The offset of the pivot point from the projection center prevents the stitching of these images into a panorama. We demonstrate how to still take advantage of this capturing mode. The geo-referencing investigation consists of testing the use of directly observed coordinates of the camera positions, different ground control point (GCP) configurations, and GCPs with different accuracies, i.e. artificial targets vs. natural features. Images of the test field in a low-slope hill were acquired from the ground using an SLR camera. To validate the photogrammetric results a terrestrial laser scanner survey is used as benchmark.

scholarly journals Theoretical justification for the development of computer model of MDF structure and its milling process

2021 ◽  
Vol 2094 (4) ◽  
pp. 042043
Author(s):  
T V Efimova ◽  
T L Ischenko
Keyword(s):  
Computer Model ◽  
Milling Process ◽  
Point Of View ◽  
Theoretical Point ◽  
The Finite Element Method ◽  
Theoretical Justification ◽  
Operating Modes ◽  
Energy Indicators

Abstract The main parameter for determination of quality of MDF boardprocessing after milling is roughness of the surface. The well-known models of wood cutting are unsuitable for the assessment of this parameter, since they make it possible to draw only qualitative conclusions about the roughness, they do not allow calculating the numerical value. To calculate the roughness value, the model must take into account the structure of the material and the main parameters affecting the roughness. The purpose of this work is to substantiate the development of a computer model of the MDF structure and the process of its milling using the finite element method. The implementation of this approach will allow, according to the specified parameters of the cutter and modes of its operation, to determine the quality and energy indicators of the milling process from a theoretical point of view. As a result of the work carried out, a detailed theoretical justification for the development of a computer model of MDF structure and the process of its milling was given. Its implementation makes it possible to determine the quality and energy parameters of the milling process according to the specified parameters of the cutter and its operating modes.

scholarly journals Conceptual Provisions on the Directions of Cost Optimization of Energy Industry Enterprises

2021 ◽  
pp. 253-261
Author(s):  
R. Reznikov ◽  
Keyword(s):  
Cost Optimization ◽  
Point Of View ◽  
Energy Industry ◽  
Economic Point ◽  
Full Analysis ◽  
The Cost ◽  
Energy Companies ◽  
And Control ◽  
Financial Balance

Conceptual provisions on the directions of cost optimization of energy industry enterprises on the basis of system, information and project approaches are proposed, which provide for the implementation of procedures for diagnosis and optimization of suboptimal costs and control of the implementation of relevant projects. Diagnosis of suboptimal costs of energy companies is proposed to be carried out using a comprehensive approach to the diagnosis of suboptimal costs based on a combination of information-logical, descriptive-analytical and economic-mathematical models of enterprise analysis, as well as full analysis (vertical and horizontal) of financial statements including P&L, analysis of Cash Flow and financial balance of the enterprise. Applying the appropriate approach allows you to identify the costs that the company can optimize without affecting the quality of electricity and without violating other aspects of the company, which frees up the company to upgrade equipment, additional logistics, reduce electricity costs and implement other projects in within the portfolio. To optimize the costs of energy companies, an appropriate project-oriented approach is proposed, which is based on the use of the method of forming a portfolio of optimization projects using a combination of WSJF model and 6 sigma matrix. The uniqueness of the approach lies in the synergy of the proposed tools and methods and their implementation for energy companies. The proposed approach allows to form a portfolio of interconnected projects, which allows to achieve better financial results through synergies between projects and saves energy companies through more efficient use of its financial resources. Implementation of conceptual provisions on the areas of cost optimization of energy companies allows to reduce the cost of electricity, losses of enterprises and increase their profitability by reinvesting savings in cost optimization projects. Optimization is achieved by diagnosing those costs that can be reduced without affecting quality and in which it makes sense to invest from an economic point of view.

scholarly journals Data for Weak Lines

1995 ◽  
Vol 10 ◽  
pp. 574-576
Author(s):  
A. Hibbert
Keyword(s):  
Oscillator Strength ◽  
Hubble Space Telescope ◽  
Relativistic Effects ◽  
Electric Dipole Transition ◽  
Point Of View ◽  
Oscillator Strengths ◽  
Theoretical Point ◽  
Dipole Matrix Element

Weak lines, being unsaturated, are particularly important for the determination of interstellar abundances of elements. From a theoretical point of view, there are several possible causes of an electric dipole transition having a small oscillator strength. In some cases, several contributions to the dipole matrix element substantially cancel (e.g. the 1808 Å line Si II), while in other cases, the oscillator strength would be zero but for the inclusion of small relativistic effects (e.g. the intersystem 1909 Å line in C. II).For weak lines, the interstellar abundances depend on the oscillator strength (calculated or measured) and the equivalent width (observed). The increased resolution of the Goddard High Resolution Spectrograph on board the Hubble Space Telescope provides for many lines equivalent widths of much greater precision than was previously available. This situation presents a challenge to theorists to improve the quality of their calculations of oscillator strengths.Such calculations are difficult for weak transitions, especially when the cause is cancellation. Of course, with larger and more powerful computer a vailable, it is possible to undertake more extensive calculations. But the quality of observational data now makes it imperative for theorists not merely to do a better calculation than before, but to give a considered estimate of the accuracy of the results. Since there are no effective theoretical methods for obtaining rigorous bounds to oscillator strengths which could give a useful guide to accuracy, theoretical estimates of accuracy can be achieved only by undertaking a systematic sequence of calculations of increasing complexity, while ensuring that no significant contributions to the calculations are omitted.

scholarly journals On the origin and development of some notions of entropy

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Francisco Balibrea
Keyword(s):  
Applied Sciences ◽  
Dynamical Systems ◽  
Topological Entropy ◽  
Discrete Dynamical Systems ◽  
Point Of View ◽  
Topological Dynamics ◽  
Theoretical Point ◽  
Compact Metric Space ◽  
Continuous Maps ◽  
And Control

AbstractDiscrete dynamical systems are given by the pair (X, f ) where X is a compact metric space and f : X → X a continuous maps. During years, a long list of results have appeared to precise and understand what is the complexity of the systems. Among them, one of the most popular is that of topological entropy. In modern applications other conditions on X and f have been considered. For example X can be non-compact or f can be discontinuous (only in a finite number of points and with bounded jumps on the values of f or even non-bounded jumps). Such systems are interesting from theoretical point of view in Topological Dynamics and appear frequently in applied sciences such as Electronics and Control Theory. In this paper we are dealing mainly with the original ideas of entropy in Thermodinamics and their evolution until the appearing in the twenty century of the notions of Shannon and Kolmogorov-Sinai entropies and the subsequent topological entropy. In turn such notions have to evolve to other recent situations where it is necessary to give some extended versions of them adapted to the new problems.

Study on Blasting Technology and Control Measures of Shallow Tunnel

2014 ◽  
Vol 488-489 ◽  
pp. 782-785
Author(s):  
Yu Lin Zou ◽  
Cong He
Keyword(s):  
Design Method ◽  
Control Measures ◽  
Western China ◽  
Control Points ◽  
Safety Control ◽  
Road Design ◽  
Highway Tunnel ◽  
And Control ◽  
Building Project

Based on a municipal highway tunnel in western China, for the building of the tunnel surface dense, especially import Portal Jude Biao most shallow depth of less than 10m building project, we proposed borehole layout, charge and detonate Network Road design method, and the corresponding control points of drilling and blasting operations and blasting safety control measures and means to ensure that the duration and quality of construction, can provide some experience of similar projects and basis.

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