IDW interpolation dataset of ash and tephra deposition following the 2021 Tajogaite volcanic eruption on La Palma, Canary Islands, Spain

The compiled dataset is the result of a field collection campaign to measure the depth of the ash and tephra layer in the aftermath of the 2021 volcanic eruption (Tajogaite) on the island of La Palma, Canary Islands, Spain. The dataset consists of two files: a shapefile and a GeoTIFF raster. The shapefile is a point layer file that displays the location of all ash depth measurements (415 points) taken in the field. To improve our sampling near the crater, where safety and time constraints prevented field collection, we manually sampled additional drone-based measurements (66 points). We combined these data into a single dataset ("ash_depth"; 481 total points) that was then used as input for a spatial interpolation using Inverse Distance Weighting (IDW). The IDW interpolation was performed using the Spatial Analyst toolbox in ArcMap 10.8.1 (Esri, 2021). As an exact deterministic interpolation, IDW estimates pixels values of unknown points by using average distance and a weight between sample points (Watson & Philip, 1985). This is ideal for a dataset that includes many field measurements since IDW interpolates between the minimum and maximum of the collected data. The model parameters were adjusted manually but the best results were yielded using the default settings, with the exception of the output cell size. The output cell size was calibrated to 2 m. The IDW parameters can be viewed in Table 1. The sample point locations were resampled from the raster file to estimate the Root Square Mean Error (RMSE) and were saved to the shapefile as "ash_idw". The RMSE of the dataset is 0.34 m. For further inquiries please contact Christopher Shatto (email: [e-mail]). Please cite the data paper link to this repository as: C. Shatto, F. Weiser and A. Walentowitz et al., Volcanic tephra deposition dataset based on interpolated field measurements following the 2021 Tajogaite Eruption on La Palma, Canary Islands, Spain, Data in Brief, https://doi.org/10.1016/j.dib.2023.109949 Power 2 Output cell size 2 Search neighborhood type Standard (circular) Major/minor semiaxis 12161.79/12161.79 Max/minimum neighbors 15/10 Sector type 1 Angle 0 Weight field None本汇编数据集源自野外采集工作，用于测算西班牙加那利群岛拉帕尔马岛2021年塔霍盖特（Tajogaite）火山喷发后的火山灰与火山碎屑层厚度。 本数据集包含两类文件：形状文件（shapefile）与GeoTIFF栅格文件。其中形状文件为点图层文件，记录了野外获取的全部415个火山灰厚度测量点位。鉴于火山口区域受安全与时间限制无法开展野外采集，我们额外通过无人机手动采集了66个测点。将两类数据整合为总点数481个的数据集"ash_depth"，随后将其作为输入，采用反距离权重插值法（Inverse Distance Weighting，IDW）进行空间插值。 本次反距离权重插值基于ArcMap 10.8.1的空间分析工具箱（Esri，2021）完成。作为一种精确的确定性插值方法，反距离权重插值通过采样点间的平均距离与权重关系，估算未知点位的像素值（Watson & Philip，1985）。该方法非常适配包含大量野外实测数据的数据集，因为其插值结果限定在实测数据的最小值与最大值区间内。模型参数经手动调整，最终采用默认参数设置获得了最优结果，仅输出像元大小除外。本次插值的输出像元大小校准为2米。反距离权重插值的参数详见表1。 从栅格文件中重采样采样点位以估算均方根误差（Root Mean Square Error，RMSE），并将结果以"ash_idw"字段存入形状文件中。本数据集的均方根误差为0.34米。如有进一步咨询，请联系Christopher Shatto（邮箱：[e-mail]）。 请引用本数据集仓库的关联数据论文如下： C. Shatto、F. Weiser及A. Walentowitz等，《基于西班牙加那利群岛拉帕尔马岛2021年塔霍盖特火山喷发后野外实测插值数据的火山碎屑沉积数据集》，《数据简报（Data in Brief）》，https://doi.org/10.1016/j.dib.2023.109949 反距离权重插值参数如下： 功率（Power）：2 输出像元大小（Output cell size）：2 搜索邻域类型（Search neighborhood type）：标准（圆形） 长/短半轴（Major/minor semiaxis）：12161.79/12161.79 最大/最邻近点数（Max/minimum neighbors）：15/10 扇区类型（Sector type）：1 角度（Angle）：0 权重字段（Weight field）：无