Data Supplement: Fracture Subgraphs from the Lilstock Pavement, Bristol Channel, UK

This dataset is supplement to the manuscript, "Investigating Spatial Heterogeneity within Fracture Networks using<br>Hierarchical Clustering and Graph Distance Metrics". The dataset consists of circular subgraphs that are sampled from larger 2D fracture networks using a fixed spacing and diameter. The large-scale fracture networks in the form of spatial graphs can be found in the dataset, "Fracture Patterns from the Lilstock Pavement, Bristol Channel, UK (https://doi.org/10.4121/14039234)". <br>The subgraphs are extracted from fracture networks corresponding to three regions that are named as Regions 1,2, and 3. Region 1 contains 219 subgraphs (spread over approximately 6017 sq. m), Region 2 contains 212 subgraphs (spread over approximately 6749 sq. m), and Region 3 contains 117 subgraphs (spread over approximately 1473 sq. m). The subgraphs are sampled with diameters of 7.5 m. The spacing between sampling circle centers is 5 m for Regions 1 and 2, and is 3 m for Region 3, so that there is some degree of overlap between the subgraphs. <br>The subgraph data is in the form of *.mat files. Each subgraph sample consists of a MATLAB graph object and a positioning matrix. The positioning is relative and may be georeferenced to UTM Zone 30 N or Coordinate Reference System EPSG: 32630 by shifting origin of the spatial positioning matrices using the 'xmin','ymin' variables corresponding to each region.

本数据集为论文《基于层次聚类与图距离指标探究裂隙网络空间异质性》（*Investigating Spatial Heterogeneity within Fracture Networks using Hierarchical Clustering and Graph Distance Metrics*）的配套补充数据集。本数据集包含通过固定间距与直径从更大规模二维裂隙网络中采样得到的圆形子图。可在数据集“英国布里斯托尔海峡利尔斯托克路面裂隙图样（https://doi.org/10.4121/14039234）”中获取以空间图形式存储的大规模裂隙网络。
该子图取自对应三个区域（分别命名为区域1、区域2与区域3）的裂隙网络。区域1包含219个子图（覆盖面积约6017平方米），区域2包含212个子图（覆盖面积约6749平方米），区域3包含117个子图（覆盖面积约1473平方米）。所有子图均以7.5米为直径进行采样。区域1与区域2的采样圆心间距为5米，区域3的采样圆心间距为3米，以此保证子图间存在一定程度的重叠。
子图数据以*.mat文件格式存储。每个子图样本包含一个MATLAB图对象与一个定位矩阵。该定位为相对坐标，可通过利用各区域对应的'xmin'、'ymin'变量调整空间定位矩阵的原点，将其转换为通用横轴墨卡托30N带（UTM Zone 30 N）坐标系或坐标参考系EPSG:32630下的地理参考坐标。