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  • Artikel
  • OceanRep  (4)
  • OceanRep: Artikel in Konferenzband  (4)
  • 1
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    Tracking the Evolution of Water Flow Patterns Based on Spatio-Temporal Particle Flow Clusters (2022)
    Details
    Publikationsdatum: 2022-09-20
    Beschreibung: Marine scientists investigate the movement of oceanic water particles with floating measurement devices released in the real ocean, as well as with virtual particles released in numerical model simulations. The detection, visualization, and evolution of clustered particles is key for gaining a comprehensive understanding of the underlying processes in the oceans. Thereby, vast amounts of mobility data (3D coordinates of these particles over time) need to be analyzed using mobility data science methods. In this paper, we describe the application of data science techniques to detect particle clusters and, more importantly, to track the evolution of these clusters over time in order to support the analysis of oceanic flows. In particular, we apply a well-known concept for tracking the cluster evolution from the data mining community that relies on pair-counting and, thus, is rather inefficient. In order to be applicable to large amounts of particles, we further elaborate two heuristic solutions to compute the cluster transitions based on spatial approximations. Experiments on real world data show a considerable speed-up while sacrificing marginal accuracy drops. Our prototype is used by domain experts for the analysis of the large-scale ocean by virtual particle release experiments in ocean simulations.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in Konferenzband
  • 2
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    Scalability and Performance of MOM: High Resolution Simulations of the Atlantic Circulation (2003)
    World Scientifcic Publishing
    In:  [Paper] In: 10th Workshop on the Use of High Performance Cumputing in Meteorology: Realizing the TeraComputing, 04.-08.11.2002, Reading, UK . Realizing Teracomputing: Proceedings of the Tenth ECMWF Workshop on the Use of High Performance Computers in Meteorology; Reading, UK, 4 – 8 November 2002 ; pp. 257-267 .
    Details
    Publikationsdatum: 2019-09-06
    Beschreibung: In the framework of FLAME (Family of Linked Atlantic Model Experiments) an eddy-permitting model of the Atlantic Ocean was used to hindcast the uptake and spreading of anthropogenic trace gases, CO2 and CFC, during the last century. The code is based on the public domain software MOM (Modular Ocean Model) Version 2.1. Towards a parallel version the code was extended for shmem and MPI message passing to achieve portability to Cray-T3E and NEC SX systems. The performance of this production code on Cray-T3E as well as NEC-SX5 and SX6 systems is discussed. To underline the need for high-resolution modeling some physical model results are presented.
    Materialart: Conference or Workshop Item , PeerReviewed
    Format: text
    DOI: 10.1142/5280
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in Konferenzband
  • 3
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    VoCC: Vortex Correlation Clustering Based on Masked Hough Transformation in Spatial Databases (2023)
    Association for Computing Machinery
    Details
    Publikationsdatum: 2023-09-28
    Beschreibung: A special focus in data mining is to identify agglomerations of data points in spatial or spatio-temporal databases. Multiple applications have been presented to make use of such clustering algorithms. However, applications exist, where not only dense areas have to be identified, but also requirements regarding the correlation of the cluster to a specific shape must be met, i.e. circles. This is the case for eddy detection in marine science, where eddies are not only specified by their density, but also their circular-shaped rotation. Traditional clustering algorithms lack the ability to take such aspects into account. In this paper, we introduce Vortex Correlation Clustering which aims to identify those correlated groups of objects oriented along a vortex. This can be achieved by adapting the Circle Hough Transformation, already known from image analysis. The presented adaptations not only allow to cluster objects depending on their location next to each other, but also allows to take the orientation of individual objects into considerations. This allows for a more precise clustering of objects. A multi-step approach allows to analyze and aggregate cluster candidates, to also include final clusters, which do not perfectly satisfy the shape condition. We evaluate our approach upon a real world application, to cluster particle simulations composing such shapes. Our approach outperforms comparable methods of clustering for this application both in terms of effectiveness and efficiency.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in Konferenzband
  • 4
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    SUSTeR: Sparse Unstructured Spatio Temporal Reconstruction on Traffic Prediction (2023)
    Association for Computing Machinery
    Details
    Publikationsdatum: 2024-02-05
    Beschreibung: Mining spatio-temporal correlation patterns for traffic prediction is a well-studied field. However, most approaches are based on the assumption of the availability of and accessibility to a sufficiently dense data source, which is rather the rare case in reality. Traffic sensors in road networks are generally highly sparse in their distribution: fleet-based traffic sensing is sparse in space but also sparse in time. There are also other traffic application, besides road traffic, like moving objects in the marine space, where observations are sparsely and arbitrarily distributed in space. In this paper, we tackle the problem of traffic prediction on sparse and spatially irregular and non-deterministic traffic observations. We draw a border between imputations and this work as we consider high sparsity rates and no fixed sensor locations. We advance correlation mining methods with a Sparse Unstructured Spatio Temporal Reconstruction (SUSTeR) framework that reconstructs traffic states from sparse non-stationary observations. For the prediction the framework creates a hidden context traffic state which is enriched in a residual fashion with each observation. Such an assimilated hidden traffic state can be used by existing traffic prediction methods to predict future traffic states. We query these states with query locations from the spatial domain.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in Konferenzband
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