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Journal articles on the topic 'A set of positional coordinates'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Herrera Martínez, Luis Alberto, and Jhon Henry Fonseca Piedrahita. "Differences in geographical coordinates of minefields in Colombia according to their acquisition method." Revista Logos Ciencia & Tecnología 15, no. 2 (2023): 33–48. http://dx.doi.org/10.22335/rlct.v15i2.1742.

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The scourge of explosive devices such as landmines, improvised explosive devices and unexploded ordnance, a product of armed conflicts in several countries around the world, has set a great precedent in the violation of fundamental human rights. In Colombia, the efforts of the government and NGOs to reduce their effects have succeeded in clearing minefields of more than 8 million square metres and destroying more than 7000 explosive devices. The standards for finding and clearing minefields (Confirmed Hazardous Areas - CHAs) include the determination of geographical coordinates (Latitude and L

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Herrera Martínez, Luis Alberto, and Jhon Henry Fonseca Piedrahita. "Differences in geographical coordinates of minefields in Colombia according to their acquisition method." Revista Logos Ciencia & Tecnología 15, no. 2 (2023): 33–48. http://dx.doi.org/10.22335/rlct.v15i2.17342.

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The scourge of explosive devices such as landmines, improvised explosive devices and unexploded ordnance, a product of armed conflicts in several countries around the world, has set a great precedent in the violation of fundamental human rights. In Colombia, the efforts of the government and NGOs to reduce their effects have succeeded in clearing minefields of more than 8 million square metres and destroying more than 7000 explosive devices. The standards for finding and clearing minefields (Confirmed Hazardous Areas - CHAs) include the determination of geographical coordinates (Latitude and L

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3

GOUDARZI, Mohammad Ali, and René Jr LANDRY. "ASSESSING HORIZONTAL POSITIONAL ACCURACY OF." Geodesy and cartography 43, no. 2 (2017): 56–65. http://dx.doi.org/10.3846/20296991.2017.1330767.

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The horizontal positional accuracy of Google Earth is assessed in the city of Montreal, Canada, using the precise coordinates of ten GPS points spatially distributed all over the city. The results show that the positional accuracy varies in the study area between ∼0.1 m in the south to ∼2.7 m in the north. Furthermore, two methods are developed for correcting the observed positional errors: (a) using a set of transformation parameters between true coordinates of the geodetic points and their coordinates in Google Earth, and by (b) interpolating the misfit vectors at the geodetic points. The fo

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Ayodele, E. G., C. J. Okolie, and O. A. Mayaki. "An Assessment of the Reliability of the NIGNET Data." March 2019 3, no. 1 (2019): 18–29. http://dx.doi.org/10.36263/nijest.2019.01.0097.

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The Nigerian Geodetic Reference Frame is defined by a number of Continuously Operating Reference Stations (CORS) that constitute the Nigerian GNSS Network (NIGNET). NIGNET is essential for planning and national development with the main goal of ensuring consistency in the geodetic framework both nationally and internationally. Currently, the strength of the network in terms of data reliability has not been adequately studied due to the fact that research into CORS in Nigeria is just evolving, which constitutes a limitation in its applications. Therefore, the aim of this research is to explore

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Zulkifli, Nur Adilla, Ami Hassan Md Din, Wan Anom Wan Aris, and Zheng Yong Chien. "DIFFERENCES BETWEEN 2009 AND 2016 REVISIONS BASED ON COORDINATES IN GDM2000." Journal of Information System and Technology Management 6, no. 24 (2021): 161–73. http://dx.doi.org/10.35631/jistm.624017.

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The Geocentric Datum of Malaysia (GDM200) is realised with respect to International Terrestrial Reference Frame (ITRF) 2000 at epoch 2nd January 2000. In comparison with the 2000 frame, ITRF2014 has significant improvement in terms of its definition and realisation. Moreover, several great earthquakes that struck the Indonesian region for the past decades have deformed the tectonic plate, resulting in a shifted GDM2000. These earthquakes, followed by post-seismic activities, has caused GDM2000 to become obsolete. Following that, the Department of Survey and Mapping Malaysia (DSMM) has taken th

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Sun, Shu Hua. "Analysis of Position for the 4-PUU Parallel Manipulator." Applied Mechanics and Materials 220-223 (November 2012): 1757–60. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1757.

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An original 4-PUU parallelManipulator with three-dimensional translations and one rotational motion about Z axis was presented. Its positional inverse modals were set up by using the conversion of coordinates and projection in analytic geometry, and the method of the forward solution of theManipulator and corresponding numerical examples were given.This methods were verified by using MATLAB software,which can provide the basis for studying the parallel robots work space. And it has wide application in the fields of industrial robots, micromanipulators, virtual axis machine tools, damping platf

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7

Torbinio, Claudio. "Positional Triage: geotagging and geographic information system (GIS)." Confronto professionale 2, no. 2 (2013): 100.

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The combination of GPS services [1] and information technology is increasing with the use of geotagging services [2] now present by default in many devices such as smartphones [3], cell phones and cameras. A phone camera, properly enabled, can take pictures and embed GPS coordinates of position in the metadata [4] of the resulting image file. Have recently also been set up online services such as Foursquare [5], Flickr [6], Twitter [7], directed to or geocaching geotagging [8]. This feature has significant effects on the deep and personal safety and the products and projects that are useful to

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Čeh, Gielsdorf, Trobec, Krivic, and Lisec. "Improving the Positional Accuracy of Traditional Cadastral Index Maps with Membrane Adjustment in Slovenia." ISPRS International Journal of Geo-Information 8, no. 8 (2019): 338. http://dx.doi.org/10.3390/ijgi8080338.

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The main purpose of this research is to evaluate the improvement in positional accuracy (PAI) of cadastral boundary points’ coordinates through the adjustment of a large set of digital cadastral index maps of rural regions based on traditional Franciscan-origin maps of heterogeneous geometric quality. The distribution of residuals of local coordinates of reference points onto the as yet unconnected neighboring points is researched. In this article, we use the adjustment method based on neighborhood transformation with a mechanical membrane model deriving from Hooke’s Law and consider a general

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Antonenkova, Tat'yana Vladimirovna. "Technological bases: concept and problems of formation." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 2 (2022): 21–32. http://dx.doi.org/10.24143/2073-1574-2022-2-21-32.

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The task of achieving the required accuracy of the positional relationship of the part surfaces, as a rule, is solved at the stage of manufacturing the engineering products. Basing is a procedure associated with the orientation of surfaces in the process of processing a part or assembling a product in order to meet the specified conditions of positional relationship. The practical interpretations of the principles of the basing theory do not allow to find the sound solutions to the key problems that arise in the course of basing. The presented analysis of the interpretations of the concepts us

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Shmutter, B., and Y. Doytsher. "Matching a set of digitized cadastral maps." CISM journal 46, no. 3 (1992): 277–84. http://dx.doi.org/10.1139/geomat-1992-0029.

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Errors inherent in the digitizing process inevitably lead to variations in the locations of boundaries of neighboring cadastral blocks. It then becomes necessary to adjust the digitized data to compensate for discrepancies and discontinuities in the digitized cadastral information. For this purpose it is proposed that a procedure commonly used in aerial triangulation be adopted. Each map is regarded as an equivalent to a single photograph and a set of neighboring maps as a photogrammetric block. A system of appropriate equations is formed to adjust the “block”. Points lying on boundaries of ad

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van Oort, P. A. J., A. Stein, A. K. Bregt, S. de Bruin, and J. Kuipers. "A Variance and Covariance Equation for Area Estimates with a Geographic Information System." Forest Science 51, no. 4 (2005): 347–56. http://dx.doi.org/10.1093/forestscience/51.4.347.

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Abstract Geographic Information Systems automatically calculate the area of a polygon from the coordinate values of the vertices that describe its boundary. Uncertainty in these coordinate values results in uncertainty in area estimates. Earlier articles showed how area uncertainty of individual polygons could be calculated. In this article we propose a covariance equation to quantify the impact of uncertainty in the position of a vertex on uncertainty in the area of all polygons sharing this vertex. The approach is based on the assumption of absence of spatial correlation in positional errors

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Ye, Maoyuan, Jing Zhang, Shanshan Zhao, Juhua Liu, Bo Du, and Dacheng Tao. "DPText-DETR: Towards Better Scene Text Detection with Dynamic Points in Transformer." Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 3 (2023): 3241–49. http://dx.doi.org/10.1609/aaai.v37i3.25430.

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Recently, Transformer-based methods, which predict polygon points or Bezier curve control points for localizing texts, are popular in scene text detection. However, these methods built upon detection transformer framework might achieve sub-optimal training efficiency and performance due to coarse positional query modeling. In addition, the point label form exploited in previous works implies the reading order of humans, which impedes the detection robustness from our observation. To address these challenges, this paper proposes a concise Dynamic Point Text DEtection TRansformer network, termed

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Ashkenazi, V. "Coordinate Systems: How to Get Your Position Very Precise and Completely Wrong." Journal of Navigation 39, no. 2 (1986): 269–78. http://dx.doi.org/10.1017/s0373463300000126.

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Positioning by navigation satellites is carried out in three-dimensional geocentric cartesian coordinates, X, Y, Z. This applies to both the Transit System, which has now been in operation for over 20 years, and the Global Positioning System which is being tested and is due to become operational in 1988. Traditionally, the cartographer, the seafaring navigator and the geodetic surveyor have always expressed their coordinates in geographical terms, i.e. latitude and longtitude, whereas the land-based civil engineer, surveyor and the foot (or mechanized) soldier preferred theirs in terms of proj

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Gupta, Tejpal, Ms Reena Phurailatpam, Mishra Ajay, Pai Rajeshri, Mohindra Pranshu, and Chopra Supriya. "Quality Assurance and Commissioning of an Infrared Marker-based Patient Positioning System for Frameless Extracranial Stereotactic Radiotherapy." International Journal of Biomedical Science 3, no. 4 (2007): 298–301. http://dx.doi.org/10.59566/ijbs.2007.3298.

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Rapid advancements in imaging technology have led to remarkable improvements in identification and localization of tumors, ushering the era of high-precision techniques in contemporary radiotherapy practice. However, uncertainties in patient set-up and organ motion during a course of fractionated radiotherapy can compromise precision of radiation therapy. Excellent accuracy has been achieved with invasive and non-invasive fixation systems for stereotactic radiotherapy. This report describes the commissioning procedure and Quality Assurance studies done to evaluate the accuracy of isocenter loc

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Malkin, Zinovy. "Improving Source Positions in the OCARS Catalog: A First Approach." Astronomical Journal 170, no. 1 (2025): 48. https://doi.org/10.3847/1538-3881/addc65.

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Abstract Optical Characteristics of Astrometric Radio Sources (OCARS) is a compiled catalog of various additional data associated with astrometric radio sources whose coordinates have been determined from very long baseline interferometry observations. It contains source coordinates, object type, redshift, optical, and near-infrared magnitudes. Until now, OCARS source coordinates were simply copied from input catalogs and, as a result, were systematically inhomogeneous. This work is the first attempt to obtain a unified set of radio source coordinates aligned to the International Celestial Ref

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Zhang, Ge, Guoxing Yi, Zhennan Wei, Yangguang Xie, and Ziyang Qi. "A Novel Positional Calibration Method for an Underwater Acoustic Beacon Array Based on the Equivalent Virtual Long Baseline Positioning Model." Journal of Marine Science and Engineering 12, no. 5 (2024): 825. http://dx.doi.org/10.3390/jmse12050825.

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The performance of long baseline (LBL) positioning systems is significantly impacted by the distribution and positional calibration accuracy of underwater acoustic beacon arrays. In previous calibration methods for beacon arrays based on autonomous underwater vehicle (AUV) platforms, the slant range information of each beacon was processed independently, and each beacon was calibrated one at a time. This approach not only decreases the calibration efficiency but also leaves the positional calibration accuracy of each beacon highly susceptible to the navigation trajectory of the AUV. To overcom

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Bookstein, Fred L. "Centric Allometry: Studying Growth Using Landmark Data." Evolutionary Biology 48, no. 2 (2021): 129–59. http://dx.doi.org/10.1007/s11692-020-09530-w.

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AbstractThe geometric morphometric (GMM) construction of Procrustes shape coordinates from a data set of homologous landmark configurations puts exact algebraic constraints on position, orientation, and geometric scale. While position as digitized is not ordinarily a biologically meaningful quantity, and orientation is relevant mainly when some organismal function interacts with a Cartesian positional gradient such as horizontality, size per se is a crucially important biometric concept, especially in contexts like growth, biomechanics, or bioenergetics. “Normalizing” or “standardizing” size (

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Abeyrathna, R. M. Rasika D., Victor Massaki Nakaguchi, Arkar Minn, and Tofael Ahamed. "Recognition and Counting of Apples in a Dynamic State Using a 3D Camera and Deep Learning Algorithms for Robotic Harvesting Systems." Sensors 23, no. 8 (2023): 3810. http://dx.doi.org/10.3390/s23083810.

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Recognition and 3D positional estimation of apples during harvesting from a robotic platform in a moving vehicle are still challenging. Fruit clusters, branches, foliage, low resolution, and different illuminations are unavoidable and cause errors in different environmental conditions. Therefore, this research aimed to develop a recognition system based on training datasets from an augmented, complex apple orchard. The recognition system was evaluated using deep learning algorithms established from a convolutional neural network (CNN). The dynamic accuracy of the modern artificial neural netwo

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Zhan, Yuehe, Shimo Wu, and Shiqi Luo. "Facing the Algorithm Study of Position Control for Five-Axis CNC Machine Tool Processing Parts." Theoretical and Natural Science 97, no. 1 (2025): 41–47. https://doi.org/10.54254/2753-8818/2025.21237.

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With the increasing demand for complex surface parts, the accuracy requirements for orientation control when manufacturing parts using five-axis CNC machine tools are also higher. This paper aims to conduct an algorithm study on the orientation control problem during the machine tool part manufacturing process. After understanding the working principle of a five-axis CNC machine tool, a simple model was established. On the basis that when the panel rotates around the B axis, the Y-axis coordinate of the drilling point and the center of the panel remains unchanged, and when it rotates around th

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Sun, Yi, Tao Ma, Chia Yung Han, Joseph Ross, and William Wee. "A Study of Tracking System Using Multiple Emitter Towers." Advanced Materials Research 694-697 (May 2013): 927–35. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.927.

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This paper presents a simple and accurate coordinate transformation method for extending the tracking space of the Intersense IS-900 spatial and motion tracking system using multiple pre-configured emitter towers to form the emitter constellation, but without resorting to the use of a surveyor machine. The proposed approach uses the differences of positional coordinate readings from each emitter tower among a set of commonly viewed spatial points to calculate the parameters needed to define the coordinate transformation. By applying this method, the tracking accuracy using the entire emitter c

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Guseva, I. S. "On the Problem of Standard Fields for CCD Astrometry." Symposium - International Astronomical Union 167 (1995): 353–54. http://dx.doi.org/10.1017/s007418090005676x.

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At the start of CCD observations one must investigate the metrological properties of the complex instrument: optics + CCD. One needs a densely spaced set of stars with precise coordinates and magnitudes. We first used the Pleiades catalogue by Eichhorn et al. (1970). Experimental observations were started at Pulkovo in 1993 using a very small refractor (D = 100 mm, F = 712 mm) equipped with a CCD ISD015A (520 × 580 pixels, 18 × 24 microns). The focal length of our astrograph provides an angular field of view of 45 × 67 arcmin (angular scale is 5.2 × 7 arcsec/pixel). With different exposures we

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Pang, Liang, Xiao Chen, Yong Shi, Zhi Xue, and Rida Khatoun. "Localization of multiple jamming attackers in vehicular ad hoc network." International Journal of Distributed Sensor Networks 13, no. 8 (2017): 155014771772569. http://dx.doi.org/10.1177/1550147717725698.

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In vehicular ad hoc network, wireless jamming attacks are easy to be launched in the control channel and can cause serious influence on the network performance which may cause further safety accidents. In order to address the issue of wireless jamming attacks, a new technique which localizes the jamming attackers and prevents vehicles from jamming through human intervention is proposed. In this article, we propose a range-free approach to localize the source of the attacker and determine the number of jamming attackers. The data set is the locating information and the jamming detection informa

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Denisov, V. P., M. V. Krutikov, A. A. Mescheryakov, and P. A. Polyanskih. "Models of Pulse Radar Signals Received by a Single-position Radio Reconnaissance Station on Ground Tracks." Ural Radio Engineering Journal 6, no. 4 (2022): 390–413. http://dx.doi.org/10.15826/urej.2022.6.4.003.

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This article represents the basics of a single-position passive method of determining the coordinates of a radio emission source by using a set of reflections of the emitted signals from natural and artificial formations on the radio waves propagation path. The algorithm is based on comparing the coordinates of possible reflectors plotted on the terrain map with the coordinates calculated from the measured bearings of the reflection sources and the delays of the reflected signals in relation to the direct signal. The data of a radiophysical experiment on the study of reflections carried out in

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Hamza, Veton, Bojan Stopar, Tomaž Ambrožič, Goran Turk, and Oskar Sterle. "Testing Multi-Frequency Low-Cost GNSS Receivers for Geodetic Monitoring Purposes." Sensors 20, no. 16 (2020): 4375. http://dx.doi.org/10.3390/s20164375.

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Global Navigation Satellite System (GNSS) technology is widely used for geodetic monitoring purposes. However, in cases where a higher risk of receiver damage is expected, geodetic GNSS receivers may be considered too expensive to be used. As an alternative, low-cost GNSS receivers that are cheap, light, and prove to be of adequate quality over short baselines, are considered. The main goal of this research is to evaluate the positional precision of a multi-frequency low-cost instrument, namely, ZED-F9P with u-blox ANN-MB-00 antenna, and to investigate its potential for displacement detection.

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Sullivan, Jessica, J. Christopher Howk, Nicolas Lehner, John M. O’Meara, and Sunil Simha. "Tilsotua: Reproducing Slitmask Sky Positions for use with the LRIS Multislit Archive." Publications of the Astronomical Society of the Pacific 137, no. 5 (2025): 054505. https://doi.org/10.1088/1538-3873/adc48a.

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Abstract We present tilsotua, a code that calculates sky positions of the slits from Low-Resolution Imaging Spectrograph (LRIS) slitmasks used in multislit observations. Raw data for the Keck/LRIS spectrograph does not include information about the sky positions of the slitmask targets, making it difficult to use beyond the scope of the original programs. tilsotua translates slit coordinates from the mask design files in the mask milling machine frame to sky coordinates. tilsotua also shifts the original input astrometry to modern frames using the objects targeted by mask alignment boxes. This

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Bruzzone, Luca, and Shahab Edin Nodehi. "Application of Half-Derivative Damping to Cartesian Space Position Control of a SCARA-like Manipulator." Robotics 11, no. 6 (2022): 152. http://dx.doi.org/10.3390/robotics11060152.

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In classical Cartesian space position control, KD, the end-effector follows the set-point trajectory with a stiffness expressed in the directions of the external coordinates through the stiffness matrix, K, and with a damping proportional to the first-order derivatives of errors of the external coordinates through the damping matrix, D. This work deals with a fractional-order extension of the Cartesian space position control, KDHD, which is characterized by an additional damping term, proportional to the half-order derivatives of the errors of the external coordinates through a second damping

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Nero, Marcelo Antonio, Jorge Pimentel Cintra, Gilberlan de Freitas Ferreira, Túllio Áullus Jó Pereira, and Thaísa Santos Faria. "A COMPUTATIONAL TOOL TO EVALUATE THE SAMPLE SIZE IN MAP POSITIONAL ACCURACY." Boletim de Ciências Geodésicas 23, no. 3 (2017): 445–60. http://dx.doi.org/10.1590/s1982-21702017000300030.

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Abstract: In many countries, the positional accuracy control by points in Cartography or Spatial data corresponds to the comparison between sets of coordinates of well-defined points in relation to the same set of points from a more accurate source. Usually, each country determines a maximum number of points which could present error values above a pre-established threshold. In many cases, the standards define the sample size as 20 points, with no more consideration, and fix this threshold in 10% of the sample. However, the sampling dimension (n), considering the statistical risk, especially w

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Gumus, Kutalmis, Cahit Tagi Celik, and Halil Erkaya. "Investigation of accurate method in 3-D position using Cors-Net in Istanbul." Boletim de Ciências Geodésicas 18, no. 2 (2012): 171–84. http://dx.doi.org/10.1590/s1982-21702012000200001.

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In this study, for Istanbul, there are two Cors Networks (Cors-TR, Iski Cors) providing Virtual Reference Station (VRS), and Flachen Korrektur Parameter (FKP), corrections to rover receiver for determining 3-D positions in real time by Global Positioning System (GPS). To determine which method (or technique) provides accurate method for position fixing, a test network consisting of 49 stations was set up in Yildiz Technical University Davudpasa Campus. The coordinates of the stations in the test network were determined by conventional geodetic, classical RTK, VRS and FKP methods serviced by bo

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Crenshaw, H. C., C. N. Ciampaglio, and M. McHenry. "Analysis of the three-dimensional trajectories of organisms: estimates of velocity, curvature and torsion from positional information." Journal of Experimental Biology 203, no. 6 (2000): 961–82. http://dx.doi.org/10.1242/jeb.203.6.961.

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Most biological motions are three-dimensional. This includes the trajectories of whole organisms and of their appendages. While recordings of three-dimensional trajectories are sometimes published, quantitative analysis of these trajectories is uncommon, primarily because there are no standard techniques or conventions in biology for the analysis of three-dimensional trajectories. This paper describes a new technique, finite helix fit (FHF), based on the geometry of three-dimensional curves, whereby a three-dimensional trajectory is completely described by its velocity, curvature and torsion.

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Markevich, V. E., and V. V. Legkostup. "Guiding a supersonic controlled object in a multi-position air basing radar." Informatics 17, no. 2 (2020): 120–38. http://dx.doi.org/10.37661/1816-0301-2020-17-2-120-138.

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The possibility of control of a guided supersonic aviation unmanned interceptor on a moving target in an autonomous airborne multi-position radar station has been investigated. To obtain the coordinate information, the algorithm of difference-range finding and difference range-Doppler spatial measurements is selected using a limited number of transmitting positions that do not provide an unambiguous determination of the coordinates and speed of the object with high accuracy. The paper proposes various approaches to eliminate a priori uncertainty regarding the estimated coordinates in a limited

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Figueiredo, Pedro, Leandro Machado, João Vilas-Boas, and Ricardo Fernandes. "Reconstruction Error of Calibration Volume's Coordinates for 3D Swimming Kinematics." Journal of Human Kinetics 29, no. 1 (2011): 35–40. http://dx.doi.org/10.2478/v10078-011-0037-6.

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Reconstruction Error of Calibration Volume's Coordinates for 3D Swimming KinematicsThe aim of this study was to investigate the accuracy and reliability of above and underwater 3D reconstruction of three calibration volumes with different control points disposal (#1 - on vertical and horizontal rods; #2 - on vertical and horizontal rods and facets; #3 - on crossed horizontal rods). Each calibration volume (3 × 2 × 3 m) was positioned in a 25 m swimming pool (half above and half below the water surface) and recorded with four underwater and two above water synchronised cameras (50 Hz). Reconstr

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Vavilova, N. B., A. A. Golovan, A. V. Kozlov, and I. A. Papusha. "A fine alignment of a strapdown inertial navigation system, witch is part of the navigation complex of an autonomous underwater vehicle and in pitching conditions." Podvodnye issledovaniia i robototehnika 52, no. 2 (2025): 72–80. https://doi.org/10.37102/1992-4429_2025_52_02_07.

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The problem of initial alignment for a strapdown inertial navigation system (INS), which is part of the navigation complex for an autonomous underwater vehicle (AUV), is being considered. INS also uses the following sensors for its aided navigation: a hydroacoustic sensor that measures the distance to a floating beacon with known coordinates, as well as a lag and depth sensor. The goal of the INS alignment problem is to accurately determine (estimate) the values of attitude angles such as heading, roll and trim using readings from inertial sensors: accelerometers, angular velocity sensors (ARC

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Hormann, Verena, Rick Lumpkin, and Renellys C. Perez. "A Generalized Method for Estimating the Structure of the Equatorial Atlantic Cold Tongue: Application to Drifter Observations." Journal of Atmospheric and Oceanic Technology 30, no. 8 (2013): 1884–95. http://dx.doi.org/10.1175/jtech-d-12-00173.1.

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Abstract A generalized method is developed to determine the position of the Atlantic northern cold tongue front across its zonal extent from satellite sea surface temperature (SST) data. Previous approaches estimated the frontal position subjectively or individually, calling for a more objective technique that is suitable for large datasets. The developed methodology is based on a median frontal SST, and associated positional uncertainties are on the order of 0.3° latitude for the period 1998–2011. Frontal characteristics are generally consistent with tropical instability waves (TIWs) and inte

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Frommholz, D. "A SYNTHETIC 3D SCENE FOR THE VALIDATION OF PHOTOGRAMMETRIC ALGORITHMS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W13 (June 5, 2019): 1221–28. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w13-1221-2019.

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<p><strong>Abstract.</strong> This paper describes the construction and composition of a synthetic test world for the validation of photogrammetric algorithms. Since its 3D objects are entirely generated by software, the geometric accuracy of the scene does not suffer from measurement errors which existing real-world ground truth is inherently afflicted with. The resulting data set covers an area of 13188 by 6144 length units and exposes positional residuals as small as the machine epsilon of the double-precision floating point numbers used exclusively for the coordinates. It

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Jiang, Sijia, Jing Hua, and Zhizhong Han. "Query Quantized Neural SLAM." Proceedings of the AAAI Conference on Artificial Intelligence 39, no. 4 (2025): 4057–65. https://doi.org/10.1609/aaai.v39i4.32425.

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Neural implicit representations have shown remarkable abilities in jointly modeling geometry, color, and camera poses in simultaneous localization and mapping (SLAM). Current methods use coordinates, positional encodings, or other geometry features as input to query neural implicit functions for signed distances and color which produce rendering errors to drive the optimization in overfitting image observations. However, due to the run time efficiency requirement in SLAM systems, we are merely allowed to conduct optimization on each frame in few iterations, which is far from enough for neural

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FRANCIOSA, PAOLO GIULIO, CARLO GAIBISSO, GIORGIO GAMBOSI, and MAURIZIO TALAMO. "A CONVEX HULL ALGORITHM FOR POINTS WITH APPROXIMATELY KNOWN POSITIONS." International Journal of Computational Geometry & Applications 04, no. 02 (1994): 153–63. http://dx.doi.org/10.1142/s0218195994000100.

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We consider the problem of deriving good approximations of the convex hull of a set of points in the plane in the realistic case that only arbitrary finite approximations of the real valued coordinates can be known. In particular, the algorithm we introduce derives sequences of improved certified approximations converging to the exact solution, at the same time allowing the insertion of new points to the problem instance. The complexity analysis of the algorithm is performed by referring to a suitable computation model, based on a RAM with logarithmic costs, and the derived space and time boun

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Avila, Ruben, and Shoaib Raza Syed. "On the Elliptical Orbit of the Earth and Position of the Sun in the Sky: An Engineering Approach." Nucleus 61, no. 1 (2024): 10–15. https://doi.org/10.71330/thenucleus.2024.1330.

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The position of the Sun as seen by an observer on the Earth’s surface and the position and velocity vectors of the Earth revolving in an elliptical orbit around the Sun can be calculated using several computational approaches. These approaches include (but are not limited to) the use of an analytical approach; a numerical approach, and the use of a Solar Position Algorithm (PSA). In the analytical methodology, the Earth’s momentum equation is transformed to eliminate its time dependence, and the equation is solved analytically. Whereas, using the numerical approach, the dimensionless momentum

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Avila, Ruben, and Shoaib Raza Syed. "On the Elliptical Orbit of the Earth and Position of the Sun in the Sky: An Engineering Approach." Nucleus 61, no. 1 (2024): 10–15. https://doi.org/10.71330/nucleus.61.01.1330.

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The position of the Sun as seen by an observer on the Earth’s surface and the position and velocity vectors of the Earth revolving in an elliptical orbit around the Sun can be calculated using several computational approaches. These approaches include (but are not limited to) the use of an analytical approach; a numerical approach, and the use of a Solar Position Algorithm (PSA). In the analytical methodology, the Earth’s momentum equation is transformed to eliminate its time dependence, and the equation is solved analytically. Whereas, using the numerical approach, the dimensionless momentum

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Javadiha, Mohammadreza, Carlos Andujar, Enrique Lacasa, Angel Ric, and Antonio Susin. "Estimating Player Positions from Padel High-Angle Videos: Accuracy Comparison of Recent Computer Vision Methods." Sensors 21, no. 10 (2021): 3368. http://dx.doi.org/10.3390/s21103368.

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The estimation of player positions is key for performance analysis in sport. In this paper, we focus on image-based, single-angle, player position estimation in padel. Unlike tennis, the primary camera view in professional padel videos follows a de facto standard, consisting of a high-angle shot at about 7.6 m above the court floor. This camera angle reduces the occlusion impact of the mesh that stands over the glass walls, and offers a convenient view for judging the depth of the ball and the player positions and poses. We evaluate and compare the accuracy of state-of-the-art computer vision

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Buharov, K., N. Grishin, M. Kudrov, L. Rybak, and V. Cherkasov. "KINEMATICS ANALYSIS OF A 6-DOF ROBOTIC MOBILITY PLATFORM FOR TEST BENCHES AND SIMULATORS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 5 (2022): 81–90. http://dx.doi.org/10.34031/2071-7318-2022-7-5-81-90.

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The article discusses the main aspects of the application of mathematical modeling methods to analyze the properties of 6-DOF robotic mobility platforms (RMP), which can be used as complete test benches and simulators for testing various equipment, road construction equipment, vehicles, aviation, rocket and space. The application of simulators made it possible to create a virtual environment for user interaction with a special type of equipment that responds to commands like a real one. In addition, the article considers a numerical method for solving the inverse kinematics problem of the RMP,

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Shui, Zhongyi, Sunyi Zheng, Chenglu Zhu, et al. "DPA-P2PNet: Deformable Proposal-Aware P2PNet for Accurate Point-Based Cell Detection." Proceedings of the AAAI Conference on Artificial Intelligence 38, no. 5 (2024): 4864–72. http://dx.doi.org/10.1609/aaai.v38i5.28289.

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Point-based cell detection (PCD), which pursues high-performance cell sensing under low-cost data annotation, has garnered increased attention in computational pathology community. Unlike mainstream PCD methods that rely on intermediate density map representations, the Point-to-Point network (P2PNet) has recently emerged as an end-to-end solution for PCD, demonstrating impressive cell detection accuracy and efficiency. Nevertheless, P2PNet is limited to decoding from a single-level feature map due to the scale-agnostic property of point proposals, which is insufficient to leverage multi-scale

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Sharma, S. "Intrafraction Verification Using ExacTrac 6D Imaging for Frameless Cranial Radiosurgery." Journal of Global Oncology 4, Supplement 2 (2018): 91s. http://dx.doi.org/10.1200/jgo.18.66600.

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Background: Radiosurgery has been an integral component in the management of intracranial tumors. It involves the administration of a high dose to the tumor. An essential aspect of this kind of treatment delivery is accurate localization of the tumor target that is precisely reproducible during treatment. To achieve this, the methods of positioning and immobilization of the patient play a critical role. Conventionally, the patient has been immobilized with invasive head frame and the location of internal anatomy deduced by external coordinates. This method has some drawbacks. - It works on the

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Boussaoud, Driss, Christophe Jouffrais, and Frank Bremmer. "Eye Position Effects on the Neuronal Activity of Dorsal Premotor Cortex in the Macaque Monkey." Journal of Neurophysiology 80, no. 3 (1998): 1132–50. http://dx.doi.org/10.1152/jn.1998.80.3.1132.

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Boussaoud, Driss, Christophe Jouffrais, and Frank Bremmer. Eye position effects on the neuronal activity of dorsal premotor cortex in the macaque monkey. J. Neurophysiol. 80: 1132–1150, 1998. Visual inputs to the brain are mapped in a retinocentric reference frame, but the motor system plans movements in a body-centered frame. This basic observation implies that the brain must transform target coordinates from one reference frame to another. Physiological studies revealed that the posterior parietal cortex may contribute a large part of such a transformation, but the question remains as to whe

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Zhu, Yicheng, Zhenhua Ai, Jinqiang Yan, Silong Li, Guowei Yang, and Teng Yu. "NATCA YOLO-Based Small Object Detection for Aerial Images." Information 15, no. 7 (2024): 414. http://dx.doi.org/10.3390/info15070414.

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The object detection model in UAV aerial image scenes faces challenges such as significant scale changes of certain objects and the presence of complex backgrounds. This paper aims to address the detection of small objects in aerial images using NATCA (neighborhood attention Transformer coordinate attention) YOLO. Specifically, the feature extraction network incorporates a neighborhood attention transformer (NAT) into the last layer to capture global context information and extract diverse features. Additionally, the feature fusion network (Neck) incorporates a coordinate attention (CA) module

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Forlani, G., and F. Rivara. "Photogrammetric determination of discrepancies between actual and planned position of dental implants." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-5 (May 28, 2014): 131–38. http://dx.doi.org/10.5194/isprsannals-ii-5-131-2014.

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The paper describes the design and testing of a photogrammetric measurement protocol set up to determine the discrepancies between the planned and actual position of computer-guided template-based dental implants. Two moulds with the implants positioned in pre- and post- intervention are produced and separately imaged with a highly redundant block of convergent images; the model with the implants is positioned on a steel frame with control points and with suitable targets attached. The theoretical accuracy of the system is better than 20 micrometers and 0.3&ndash;0.4&deg; respectively

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Susaki, J., and H. Kishimoto. "IMPROVING THE ACCURACY OF ESTIMATED 3D POSITIONS USING MULTI-TEMPORAL ALOS/PRISM TRIPLET IMAGES." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3/W4 (March 11, 2015): 223–30. http://dx.doi.org/10.5194/isprsannals-ii-3-w4-223-2015.

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In this paper, we present a method to improve the accuracy of a digital surface model (DSM) by utilizing multi-temporal triplet images. The Advanced Land Observing Satellite (ALOS) / Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) measures triplet images in the forward, nadir, and backward view directions, and a DSM is generated from the obtained set of triplet images. To generate a certain period of DSM, multiple DSMs generated from individual triplet images are compared, and outliers are removed. Our proposed method uses a traditional surveying approach to increase observat

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Jarløv, Anders, Anne Elisabeth Jarløv, and Tim Toftgaard Jensen. "Recordings of Impedance and Communication Between Defibrillator and Pacemaker Electrodes." International Journal of Biomedical and Clinical Engineering 8, no. 2 (2019): 45–68. http://dx.doi.org/10.4018/ijbce.2019070103.

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External defibrillation involves short electric shocks of several thousand volts applied to the chest of patients suffering from heart stop. The shock coordinates disorganized muscle fibers of the heart which then can resume normal activity. Implanted pacemakers monitor the natural electrical activity of the heart via electrodes mounted permanently on the inside of the heart. If this activity is insufficient, the pacemaker stimulates the heart muscle by applying a short electrical impulse of a few volts. During the period of defibrillation, voltage differences arise simultaneously between vari

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Islam, Mohammad Shaiful, Tomoaki Nakamura, Yong-Hwan Cho, and Norimi Mizutani. "Investigation of the Spiral Wave Generation and Propagation on a Numerical Circular Wave Tank Model." Journal of Marine Science and Engineering 11, no. 2 (2023): 388. http://dx.doi.org/10.3390/jmse11020388.

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A two-phase incompressible flow model in three-dimensional cylindrical coordinates is applied for oblique wave generation in a numerical circular wave tank. The governing equations are discretized by a finite volume method, and a mass source function is added to reproduce oblique waves through a spiral wave generator positioned at the center of the tank. The volume of fluid method is implemented to track the free surfaces between the air and fluid, and the zonal embedded grid system is adopted to obtain a grid-independent solution in the cylindrical coordinates. A permeable, circumferentially

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Zuenko, Alexander A., Yurii A. Oleynik, and Roman A. Makedonov. "Planning of the open-pit working edge positions by the periods of mining within the constraint programming paradigm." Transaction Kola Science Centre 12, no. 5-2021 (2021): 161–65. http://dx.doi.org/10.37614/2307-5252.2021.5.12.015.

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The work is aimed at solving the three-dimensional problem of finding the open-pit working edge positions by the periods of mining, taking into account the a priori specified productivity for the mineral and overburden. The proposed method uses a block model of a pit, where for each block its coordinates, the content of minerals in it, and the conditional initial value of the block are known. Also, a discounting function is set - a change in the total value of a block, depending on the period of its mining. The task is to find the distribution of blocks over mining periods that maximizes the t

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Quiroga-Ocaña, Guillermo, Julio C. Montaño-Moreno, Enrique A. Enríquez-Velásquez, et al. "Computing and Assessment of Discrete Angle Positions for Optimizing the Solar Energy Harvesting for Urban Sustainable Development." Energies 14, no. 20 (2021): 6441. http://dx.doi.org/10.3390/en14206441.

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This paper proposes the computation and assessment of optimal tilt and azimuth angles for a receiving surface, using a mathematical model developed at the University of Tomsk, Russia. The model was validated and analyzed for the Nuevo León State, Northeast Mexico, utilizing a set of metrics, comparing against satellite data from NASA. A point of interest in the city of Monterrey was analyzed to identify orientation patterns throughout the year for an optimal solar energy gathering. The aim is providing the best orientation tilt angles for photovoltaic or solar thermal panels without tracking s

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