Data for: UK redwoods terrestrial laser scanner point clouds

Giant redwoods (Sequoiadendron giganteum) are some of the UK’s largest trees, despite only being introduced in the mid-19th century. Given recent interest in planting redwoods in the UK, partly due to their carbon sequestration potential and also their undoubted public appeal, an understanding of their viability is important. However, little or no research has been conducted to quantitatively estimate their carbon uptake in UK conditions. We used 3D terrestrial laser scanning (TLS) to make detailed structure measurements of individual S. giganteum trees at three sites, to estimate aboveground biomass (AGB) and annual biomass accumulation rates. We show that UK-grown S. giganteum can sequester carbon at a rate of 80 - 100 kg C year-1, varying with climate, management and age. This accumulation rate is 2.5 and 20 times faster than commonly-grown UK plantation tree species. We develop new UK-specific allometric models for S. giganteumwhich fit observed AGB with r2 > 0.93 and bias < ..., TLS data were collected at 3 different UK sites in April 2022 and April 2023. TLS data were collected with a RIEGL VZ-400i V-Line 3D TLS (RIEGL Laser Measurement Systems GmbH, 2017). The scanner has a range of ~700 m, beam divergence 0.35 milliradians and emits light at 1550 nm. At each location an upright scan and a scan at 90° tilt were taken. The angular resolution of each scan was 0.04°. The scanner was mounted on a tripod at 1.5 m above the ground. At Havering and Benmore, due to the avenue layout, scans were conducted ~10 m apart (Wilkes et al. 2017) down the centre of the avenue, and then at either side of each line of trees, to try to ensure full coverage around all trees. At Havering this was difficult due to the proximity of fences at some points. At Wakehurst trees were sampled in a radial pattern, again at ~10 m apart, with locations being chosen to try to ensure full coverage around all trees. TLS scans from all positions were co-registered into point clouds for each plot u..., Point clouds are all ascii txt files, with columns comprising x, y, z in each case and can be opened using CloudCompare (v 2.12.0).巨红杉（Sequoiadendron giganteum）是英国境内体型最大的树种之一，尽管它们直至19世纪中期才被引入该国。鉴于近期英国国内兴起红杉种植热潮，这一趋势一方面源于其固碳潜力，另一方面则得益于其无可比拟的公众吸引力，因此评估其种植可行性显得至关重要。然而，目前鲜有甚至尚未有研究针对英国本土环境下的巨红杉碳吸收量进行定量估算。 本研究采用三维地面激光扫描（Terrestrial Laser Scanning, TLS）技术，对三处样地的单个巨红杉个体开展精细化结构测量，以此估算其地上生物量（Aboveground Biomass, AGB）与年生物量累积速率。研究结果表明，在英国种植的巨红杉固碳速率可达80~100 kg C·year⁻¹，该速率会因气候、管理方式与树龄的不同而产生波动。这一累积速率分别是英国常见人工林树种的2.5倍与20倍。 我们构建了适用于英国本土的巨红杉异速生长新模型，该模型与实测地上生物量的拟合优度r²>0.93，偏差小于……。TLS数据采集于2022年4月与2023年4月的三处英国样地。本次扫描使用的设备为RIEGL VZ-400i V-Line三维地面激光扫描仪（RIEGL激光测量系统有限公司，2017）。该扫描仪的测量量程约为700米，光束发散角为0.35毫弧度，发射波长为1550 nm的激光。 在每个样地中，均完成了一次垂直扫描与一次90°倾斜扫描。单次扫描的角分辨率为0.04°。扫描仪被安装在距地面1.5米高的三脚架上。在哈弗林（Havering）与本莫尔（Benmore）样地，由于采用林荫道布局，扫描点沿林荫道中心每隔约10米布设一处（Wilkes等，2017），随后在每列树木的两侧补充扫描，以确保覆盖所有树木的完整周边区域。不过在哈弗林样地，部分区域因围栏过近导致扫描覆盖存在困难。在韦克赫斯特（Wakehurst）样地，树木采样采用放射状布设方案，扫描点同样间隔约10米，点位选择以确保覆盖所有树木的完整周边区域为目标。 所有扫描点位获取的点云数据均被配准至各样地的点云文件中……。本次生成的点云数据均为ASCII文本格式，每列分别对应x、y、z坐标，可通过CloudCompare（v 2.12.0）软件打开。