Edge-bundled spatial layer to visualize mobility flows in Europe on NUTS 2 level
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Description of edge-bundled spatial layer This repository contains a GeoPackage of edge-bundled line geometries between the centroids of all NUTS 2 regions in continental Europe. The centroids of the NUTS 2 regions are derived from the 2021 version of the regions. The spatial layer contains just the edge-bundled lines, and no values for the flows. The coordinate reference system used is the ETRS89-extended / LAEA Europe (EPSG:3035) commonly used by The European Union. This data is made to support the visualization of complex origin-destination matrix mobility data on the NUTS 2 level in Europe. Straight line geometries between origin and destination points can lose their legibility when the number of flows gets high. Usage To use the spatial layer, combine the provided GeoPackage with your origin-destination matrix data, such as migration, student exchange, or some other flow data. The edge-bundled flows has a directionality-preserving column for joining the flows (OD_ID). This can be done in QGIS/ArcGIS with a table join or in R/Python with a data frame merge. Data structure Column Description Datatype fid Unique identifier for a row in the data Integer (64 bit) orig_nuts The NUTS 2 code of the origin. String dest_nuts The NUTS 2 code of the destination. String OD_ID Unique identifier for the mobility using the NUTS 2 codes for origin and destination. E.g., FI1B_DK03 String Production code The spatial layer was produced by the Edge-bundling tool for regional mobility flow data, which is a fork of a similar tool by Ondrej Peterka (2024), which is based on the work of Wallinger et al., (2022). References Peterka, O. (2024). Xpeterk1/edge-path-bundling [Python, C++]. https://github.com/xpeterk1/edge-path-bundling (Original work published 2023) Wallinger, M., Archambault, D., Auber, D., Nöllenburg, M., & Peltonen, J. (2022). Edge-Path Bundling: A Less Ambiguous Edge Bundling Approach. IEEE Transactions on Visualization and Computer Graphics, 28(1), 313–323. https://doi.org/10.1109/TVCG.2021.3114795
# 捆绑边空间图层数据集说明 本仓库收纳了欧洲大陆所有欧盟统计区域命名体系2级（NUTS 2）区域质心之间的捆绑边线几何形状的GeoPackage文件。NUTS 2级区域的质心源自2021版区域数据集。该空间图层仅包含捆绑边线，未附带任何流量数值。所用坐标系为欧盟通用的ETRS89扩展/LAEA欧洲坐标系（EPSG:3035）。 本数据集旨在支撑欧洲NUTS 2层级下复杂起讫点矩阵迁移类数据的可视化。当流量规模较大时，起讫点之间的直线几何形状往往会丧失可读性。 ## 使用方法 若要使用该空间图层，请将提供的GeoPackage文件与你的起讫点矩阵数据（如移民、学生交流或其他流量数据）相结合。捆绑边流量数据设有一个保留方向性的关联列（OD_ID），可用于匹配流量数据。此操作可通过QGIS/ArcGIS的表连接功能实现，也可在R/Python环境中通过数据框合并完成。 ## 数据结构 | 列名 | 描述 | 数据类型 | | ---- | ---- | ---- | | fid | 数据中行的唯一标识符 | 64位整数 | | orig_nuts | 起点的NUTS 2代码 | 字符串 | | dest_nuts | 终点的NUTS 2代码 | 字符串 | | OD_ID | 基于起讫点NUTS 2代码的迁移唯一标识符。例如：FI1B_DK03 | 字符串 | ## 制作代码 本空间图层通过面向区域迁移流量数据的边捆绑工具制作，该工具是Ondrej Peterka（2024）开发的同类工具的分支，其开发基础为Wallinger等人（2022）的研究成果。 ## 参考文献 Peterka, O. (2024). Xpeterk1/edge-path-bundling [Python, C++]. https://github.com/xpeterk1/edge-path-bundling (Original work published 2023) Wallinger, M., Archambault, D., Auber, D., Nöllenburg, M., & Peltonen, J. (2022). Edge-Path Bundling: A Less Ambiguous Edge Bundling Approach. IEEE Transactions on Visualization and Computer Graphics, 28(1), 313–323. https://doi.org/10.1109/TVCG.2021.3114799
