Interpolation by regularized spline with tension: II. Application to terrain modeling and surface geometry analysis

1993 ◽  
Vol 25 (6) ◽  
pp. 657-669 ◽  
Author(s):  
Helena Mitášová ◽  
Jaroslav Hofierka
Keyword(s):  
Surface Geometry ◽  
Terrain Modeling ◽  
Geometry Analysis

Geometrical characterisation of fault arrays in three dimensions

2021 ◽  
Author(s):  
Vincent Roche ◽  
Giovanni Camanni ◽  
Conrad Childs ◽  
Tom Manzocchi ◽  
John Walsh ◽  
...  
Keyword(s):  
Full Range ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Normal Faults ◽  
Fault Geometry ◽  
Surface Geometry ◽  
Fault Surface ◽  
Mechanical Stratigraphy ◽  
Quantitative Basis ◽  
Geometry Analysis

<p>Normal faults are often complex three-dimensional structures comprising multiple sub-parallel segments separated by intact or breached relay zones. In this study we outline geometrical characterisations capturing this 3D complexity and providing a semi-quantitative basis for the comparison of faults and for defining the factors controlling their geometrical evolution. Relay zones are classified according to whether they step in the strike or dip direction and whether the relay zone-bounding fault segments are unconnected in 3D or bifurcate from a single surface. Complex fault surface geometry is then described in terms of the relative numbers of different types of relay zones to allow comparison of fault geometry between different faults and different geological settings. A large database of 87 fault arrays compiled primarily from mapping 3D seismic reflection surveys and classified according to this scheme, reveals the diversity of 3D fault geometry. Analysis demonstrates that mapped fault geometries depend on geological controls, primarily the heterogeneity of the faulted sequence and the presence of a pre-existing structure. For example, relay zones with an upward bifurcating geometry are prevalent in faults that reactivate deeper structures, whereas the formation of laterally bifurcating relays is promoted by heterogeneous mechanical stratigraphy. In addition, mapped segmentation depends on resolution limits and biases in fault mapping from seismic data. In particular, the results suggest that the proportion of bifurcating relay zones increases as data resolution increases. Overall, where a significant number of relay zones are mapped on a single fault, a wide variety of relay zone geometries occurs, demonstrating that individual faults can comprise segments that are both bifurcating and unconnected in three dimensions. Models for the geometrical evolution of fault arrays must therefore account for the full range of relay zone geometries that appears to be a characteristic of all faults.</p>

PROPERTIES OF WC-Cu ELECTRO SPARK COATINGS SUBJECTED TO LASER MODIFICATION

Tribologia ◽  
2017 ◽  
pp. 73-79 ◽  
Author(s):  
Izabela PLISZKA ◽  
Norbert RADEK ◽  
Aneta GĄDEK-MOSZCZAK
Keyword(s):  
Laser Treatment ◽  
Thin Layers ◽  
Laser Beams ◽  
Surface Geometry ◽  
Tribological Test ◽  
Electrospark Deposition ◽  
Electrospark Coating ◽  
Laser Surface Modification ◽  
Deposition Surface ◽  
Geometry Analysis

The article presents the possibilities of using laser surface modification on the way EDM to better tribological properties. The paper tries to expand knowledge in the fields of the application of electrospark deposition. Surface treatment by applying a coating by electrospark deposition has many advantages (e.g., local interface or applying thin layers); therefore, this technology is used in the industry. Concentrated streams of laser beams can effectively modified the state of the electrospark coating, WC-Cu, and improve its performance. The aim of the study is to evaluate the influence of laser treatment on the properties of electrospark coatings. Evaluation of the properties of the coatings after laser treatment was carried out by observation of the microstructure, surface geometry analysis, and tribological test.

scholarly journals Segmentation of Change in Surface Geometry Analysis for Cultural Heritage Applications

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4899
Author(s):  
Sunita Saha ◽  
Jacek Martusewicz ◽  
Noëlle L. W. Streeton ◽  
Robert Sitnik
Keyword(s):  
Cultural Heritage ◽  
Target Surface ◽  
Segmentation Method ◽  
Surface Geometry ◽  
Time Intervals ◽  
Measurement Results ◽  
Local Distance ◽  
Geometrical Data ◽  
Point To Point ◽  
Geometry Analysis

This work proposes a change-based segmentation method for applications to cultural heritage (CH) imaging to perform monitoring and assess changes at each surface point. It can be used as a support or component of the 3D sensors to analyze surface geometry changes. In this research, we proposed a new method to identify surface changes employing segmentation based on 3D geometrical data acquired at different time intervals. The geometrical comparison was performed by calculating point-to-point Euclidean distances for each pair of surface points between the target and source geometry models. Four other methods for local distance measurement were proposed and tested. In the segmentation method, we analyze the local histograms of the distances between the measuring points of the source and target models. Then the parameters of these histograms are determined, and predefined classes are assigned to target surface points. The proposed methodology was evaluated by considering two different case studies of restoration issues on CH surfaces and monitoring them over time. The results were presented with a colormap visualization for each category of the detected change in the analysis. The proposed segmentation method will help in the field of conservation and restoration for the documentation and quantification of geometrical surface change information. This analysis can help in decision-making for the assessment of damage and potential prevention of further damage, and the interpretation of measurement results.

Stochastic Geometry Analysis of Cellular Networks

2018 ◽  
Author(s):  
Bartłomiej Błaszczyszyn ◽  
Martin Haenggi ◽  
Paul Keeler ◽  
Sayandev Mukherjee
Keyword(s):  
Cellular Networks ◽  
Stochastic Geometry ◽  
Geometry Analysis

Stochastic Geometry Analysis of Wireless Backhaul Networks with Beamforming in Roadside Environments

2021 ◽  
Vol E104.B (1) ◽  
pp. 118-127
Author(s):  
Yuxiang FU ◽  
Koji YAMAMOTO ◽  
Yusuke KODA ◽  
Takayuki NISHIO ◽  
Masahiro MORIKURA ◽  
...  
Keyword(s):  
Stochastic Geometry ◽  
Wireless Backhaul ◽  
Backhaul Networks ◽  
Geometry Analysis

Perceived Glossiness: Beyond Surface Properties

2019 ◽  
Vol 2019 (1) ◽  
pp. 37-42
Author(s):  
Davit Gigilashvili ◽  
Jean-Baptiste Thomas ◽  
Marius Pedersen ◽  
Jon Yngve Hardeberg
Keyword(s):  
Surface Properties ◽  
Human Subjects ◽  
Surface Geometry ◽  
Surface Reflection ◽  
Different Color

Gloss is widely accepted as a surface- and illuminationbased property, both by definition and by means of metrology. However, mechanisms of gloss perception are yet to be fully understood. Potential cues generating gloss perception can be a product of phenomena other than surface reflection and can vary from person to person. While human observers are less likely to be capable of inverting optics, they might also fail predicting the origin of the cues. Therefore, we hypothesize that color and translucency could also impact perceived glossiness. In order to validate our hypothesis, we conducted series of psychophysical experiments asking observers to rank objects by their glossiness. The objects had the identical surface geometry and shape but different color and translucency. The experiments have demonstrated that people do not perceive objects with identical surface equally glossy. Human subjects are usually able to rank objects of identical surface by their glossiness. However, the strategy used for ranking varies across the groups of people.

Bilateral Breast Geometry Analysis A Preliminary Tool for Detection of Breast Abnormality

2019 ◽  
Vol 7 (9) ◽  
pp. 72-77
Author(s):  
Hidangmayum Bebina ◽  
Joshi Manisha Shivaram ◽  
Aradhana Katke ◽  
Umadevi V
Keyword(s):  
Breast Abnormality ◽  
Geometry Analysis

EVALUATION OF VEHICLE MOBILITY THROUGH UAS PHOTOGRAMMETRY AND DIGITAL TERRAIN MODELING WITH HIGH RESOLUTION DATASETS

2019 ◽  
Author(s):  
Evan J. Hartshorn ◽  
◽  
Eric V. McDonald ◽  
David Page ◽  
Donald Edwin Sabol ◽  
...  
Keyword(s):  
High Resolution ◽  
Terrain Modeling ◽  
Digital Terrain ◽  
Vehicle Mobility ◽  
Digital Terrain Modeling

The role of terrain modeling in lunar rover simulation

SIMULATION ◽  
1993 ◽  
Vol 61 (1) ◽  
pp. 60-68
Author(s):  
Niranjan S. Rao ◽  
Matthew H. Appleby
Keyword(s):  
Terrain Modeling ◽  
Lunar Rover
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