Abstract
Interpolation and approximation of scattered scalar and vector data is a part of a solution of many engineering problems. The methods are based mostly on some triangulation of the data domain, usually limited to 2D or 3D data, followed by an interpolation or an approximation to obtain a smooth result. This contribution presents a meshless approach based on the Radial Basis Functions (RBF). It is nearly dimensionless and it enables interpolation of time varying data, i.e. interpolation of scattered spatio-temporal varying data, i.e. interpolation in space-time domain without “time-frames”. The meshless methods for scattered spatio-temporal data can be used for interpolation, approximation and evaluation of data acquired from buoys, sensor networks, sensors for tsunami, chemical and radiation detectors, ships and submarines detection, weather forecast, 3D vector fields compression and visualization, etc.
Research partially supported by the University of West Bohemia - Institutional research support.
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Notes
- 1.
For non DT tessellation, see Smolik [45].
- 2.
In the case of high N using block matrices might help in solving large systems of linear equations, see Majdisova [28] - a system of \(6.7\ 10^6\) points was solved.
- 3.
The distance defined as \(\Vert .\Vert _1\) is used in fuzzy approach, see Perfilieva [32].
- 4.
It should be noted that \(r^2 \log (r)= \frac{1}{2} r^2 \log (r^2)\), i.e. actually no \(\sqrt{r^2}\) computation is needed, only the values of the weights \(\lambda _j\) are doubled.
- 5.
In the actual implementation \(\varphi (r)=r^2 \ln {r^2}\) should be used as \(r^2 \ln {r^2}=2~r^2 \ln {r}\). The \(\lambda \) weights are doubled and \(\sqrt{.}\) operation is not needed.
- 6.
The SN-RBF with the Gauss function and bilinear polynomial was used; parameters \(\alpha =0.255\) and \(\beta =1\) in Eq. 10.
- 7.
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Acknowledgments
The author thanks to colleagues at the Shandong University(Jinan) and Zhejiang University(Hangzhou) China, University of West Bohemia, Pilsen for their critical comments, discussions, especially to colleagues Michal Smolik, Zuzana Majdisova, Martin Cervenka, Mariia Martynova and Jan Kasak for producing some images and for numerical verification.
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Skala, V. (2023). Multidimensional Scattered Time-varying Scattered Data Meshless Interpolation for Sensor Networks. In: Gervasi, O., et al. Computational Science and Its Applications – ICCSA 2023. ICCSA 2023. Lecture Notes in Computer Science, vol 13956 . Springer, Cham. https://doi.org/10.1007/978-3-031-36805-9_7
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