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. 2017 Oct 3;7:12565. doi: 10.1038/s41598-017-12852-z

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The illustration of the spatial (W _s), temporal (W _t), and combined (W _c) weighting schemes. The top figure shows the spatial weight decrease with the increasing distance (calculated using Equation 2, D is set to 500); the figure on the right shows the temporal weight having a bell curve with the center around 19–20 (calculated using Equation 3, parameters are set to T1 = 12, T2 = 27); the bottom left figure shows the combined weight distribution using the colors, the darker the higher W _c (calculated using Equation 1).