संघ लोक सेवा आयोग’s Post

Excited to announce that my recent article, "Performance Analysis of Optical Flow Techniques for Airborne SAR Image Registration " is published in IEEE Transactions on Geoscience and Remote Sensing (GRSS) and is also chosen as the GRSS article of the week. Our latest research exploring the application of optical flow techniques, commonly used in computer vision, to radar data analysis. Our study, conducted using data from Fraunhofer FHR's Wachtberg airborne imaging radar, addresses the challenges posed by fluctuating flight paths and wide incidence angle ranges. While conventional methods struggle with data coregistration due to these challenges, we've found that computer vision methods such as TVL1, Horn & Schunck, Lucas Kanade, and RAFT offer promising solutions. Through extensive analysis across simulated and real data scenarios, our research demonstrates the effectiveness of these CV techniques, particularly highlighting TVL1's robust performance. This work showcases the potential of computer vision in enhancing radar data analysis, offering insights that can advance various applications in remote sensing and geoscience. To read more : 10.1109/TGRS.2024.3369402 I am grateful to the European Union's Horizon 2020 Research and Innovation Program for their support via the Marie Skłodowska-Curie Grant and MENELAOS-NT. Special thanks to Fraunhofer FHR for their invaluable contribution of the dataset, without which this research would not have been achievable. Their support has been essential to the success of this study. #SAR #earthobservation #remotesensing #computervision #radardataanalysis

The article I wish I had written!... So relevant. To finally put an end to the multitude of publications that consistently present misleading variations of the Gutenberg-Richter b-value. When will they realize that they are merely seeing computational biases?https://lnkd.in/etynJKH9

The article titled "Integrative Probabilistic Design of River Jetties by 3D Numerical Models of Transport Phenomena: The Case Study of Kabakoz River Jetties" that we wrote together with Can Elmar Balas was published in the Marine Science and Technology Bulletin.

In geoid modelling, the gravimetric data are measured at the surface of the Earth, the gravitational effect of the topographic masses should be removed from the data before using them for geoid modelling. Watch my lecture to see how this effect is modelled mathematically. https://lnkd.in/dqZc3Twe

Modelling the evolution of nearshore coastal processes always poses a challenge due to the complex interactions between waves, hydrodynamics and the coastal bed, especially in the presence of coastal protection works. Our publication (Modelling MDPI) presents an integrated numerical model, driven initially by a mild-slope wave model for the efficient simulation of nearshore coastal processes. The model is validated against experimental measurements, exhibiting solid performance in various settings, with special attention given to the wave structure interaction and the effect of wave reflection in longshore dynamics. If you're interested in the details, you can access our paper through the link: https://lnkd.in/de-ZaG_w. If you have any questions or would like to discuss the findings further, please feel free to reach out. Grateful for the collaboration with Assistant Professor Michalis Chondros and Dr. Andreas Papadimitriou. National Technical University of Athens, Scientia Maris #NumericalModelling #CoastalProcesses #WaveReflection #WaveEnergyDissipation

PAGravf4.5en is always fee and open. www.zcyphygeodesy.com/en/ The basic principles, main methods and all the formulas in physical geodesy and Earth gravity field have been realized completely in PAGravf4.5 to imporve high education environment. Many long-term puzzles such as various terrain effects on various observations, all-element analytical modelling on gravity field, fine gravity prospecting modelling from heterogeneous observations, external accuracy index measurement and computational performance control have been effectively solved to strengthen the application capacity of Earth gravity field.

Freshly published Bulletin of the Institute of Mathematical Statistics includes also a #YoungStatS contribution from Professor Darryl D. Holm (Imperial College London) about transport noise in fluid dynamics, topic of our November's webinar. Hopingly an interesting read. #probability #stochasticprocesses #fluiddynamics #optimaltransport #stochasticnoise #oceanography #youngstats #ims #mathematics

Excited to share our recent paper titled ‘A generalized Chebyshev operational method for Volterra integro-partial differential equations with weakly singular kernels‘. It introduces a Matrix Collocation Method for solving Volterra integro-partial differential equations with weakly singular kernels (VIPDEWSK). The approach utilizes Shifted Chebyshev Polynomials of the Fifth Kind (SCPFK) to construct pseudo-operational matrices, avoiding explicit integration for faster computations. Error bounds are analyzed in a Chebyshev-weighted space, offering insights into approximation accuracy. Big thanks to Professor Sadri and the other co-authors for their collaborative efforts. You can access the article right here: 2024DOI:https://lnkd.in/evHB66Qj https://lnkd.in/e98gmPwf

https://lnkd.in/eT4rMnk3 Geographical structure of Chinese dialects A computational, fuzzy cluster analysis along the three dimensions - historical Chinese settlement patterns - river systems - mountain ranges

[Diagram Explained] Space, Thematic Space, and Activity System + In the previous articles, I discussed three themes about knowledge diagrams: 1. The theme of “Hierarchy”: The Ecological Formism Approach to Diagrams 2. The theme of “Network”: Concept System, Diagram Network, and Knowledge Frameworks 3. The theme of “Path”: Activity, Knowledge, and Moving on Diagrams 4. The theme of “Concept”: Themes, Concepts, and Situational Diagrams This article aims to discuss the theme of “Space” because it is related to Situational Diagrams. I will use the Activity System Model as an example for our discussion. See the above diagram. Part 1 will tell the story and Part 2 moves on to discuss the theme of “Space” from the perspective of Thematic Space Theory (TST). https://lnkd.in/gg2dg74a (2/4/2024)