A dataset of branch reflectance spectra for seven boreal and temperate tree species

This dataset is a part of the following publication titled "A spectral library of branches for seven boreal and temperate tree species" published in Data in Brief. This dataset contains a novel spectral library capturing the hyperspectral reflectance of branches from seven boreal and temperate tree species. The reflectance spectra of branches were measured for coniferous and broadleaf tree species: European aspen (Populus tremula L.), goat willow (Salix caprea L.), grey alder (Alnus incana (L.) Moench), silver birch (Betula pendula Roth), Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst), and Siberian larch (Larix sibirica Ledeb.). The branch samples were collected in southern Finland between September and November 2024, and measured in laboratory conditions using a spectroradiometer (ASD FieldSpec 4 Standard-Res) coupled with a custom contact probe (Thorlabs Bifurcated 19-Fiber Bundle), an integrating sphere (Avantes Avasphere-30), and a light source (Ocean Optics HL-2000). In addition to the spectral measurements, auxiliary field measurements were conducted to describe the sampled branch and the tree it was detached from, e.g., tree height and branch length. - The file "contact_probe_spectral_measurements.csv" contains conical-conical reflectance factor (CCRF) spectra of tree branches measured with a contact probe setup and a spectroradiometer. - The file "integrating_sphere_spectral_measurements.csv" contains directional-hemispherical reflectance factor (HDRF) spectra of tree branches measured with an integrating sphere setup and a spectroradiometer. - The file "sampled_tree_descriptions.csv" contains auxiliary data for each of the sampled trees. - The file "sample_photos.pdf" shows photographs of the measured branch samples and the trees they were detached from. Please refer to the Data in Brief publication for more details on sampling, spectral measurements, data processing, and how to interpret the files contained in this dataset. If using this data, please cite this Mendeley Dataset and the accompanying Data in Brief publication: - Juola, Jussi; Rautiainen, Miina; Hovi, Aarne (2025), "A spectral library of branches for seven boreal and temperate tree species", Data in Brief, 112255, doi: 10.1016/j.dib.2025.112255 - Juola, Jussi; Rautiainen, Miina; Hovi, Aarne (2025), "A dataset of branch reflectance spectra for seven boreal and temperate tree species", Mendeley Data, V2, doi: 10.17632/kvnx6vt8x9.2 Version history: This is Version 2 of the dataset. Reference to the accompanying Data in Brief publication was added. Data are identical to Version 1.本数据集隶属于发表于《数据简报（Data in Brief）》期刊、题为《七种寒带与温带树木枝条光谱库》的研究论文。 本数据集包含一套全新的光谱库，收录了7种寒带与温带树木枝条的高光谱反射率（hyperspectral reflectance）数据。本次测量涵盖针叶与阔叶两类树种，涉及的树种包括：欧洲山杨（Populus tremula L.）、山羊柳（Salix caprea L.）、灰桤木（Alnus incana (L.) Moench）、垂枝桦（Betula pendula Roth）、欧洲赤松（Pinus sylvestris L.）、挪威云杉（Picea abies (L.) H. Karst）以及西伯利亚落叶松（Larix sibirica Ledeb.）。 枝条样本于2024年9月至11月间在芬兰南部采集，并于实验室环境下完成光谱测量：测量核心设备为光谱辐射计（spectroradiometer，ASD FieldSpec 4 Standard-Res），配套定制接触式探头（Thorlabs Bifurcated 19-Fiber Bundle）、积分球（integrating sphere，Avantes Avasphere-30）以及光源（Ocean Optics HL-2000）。 除光谱测量外，本研究还开展了辅助野外测量，以记录采集枝条及其母树的相关信息，例如树高与枝条长度。 - 文件"contact_probe_spectral_measurements.csv"收录了通过接触式探头装置与光谱辐射计测量得到的树木枝条锥-锥反射率因子（conical-conical reflectance factor, CCRF）光谱数据。 - 文件"integrating_sphere_spectral_measurements.csv"收录了通过积分球装置与光谱辐射计测量得到的树木枝条方向-半球反射率因子（directional-hemispherical reflectance factor, HDRF）光谱数据。 - 文件"sampled_tree_descriptions.csv"收录了各采集母树的辅助数据集。 - 文件"sample_photos.pdf"展示了待测枝条样本及其母树的实拍照片。 如需了解采样、光谱测量、数据处理以及本数据集文件解读的更多细节，请查阅前述《数据简报（Data in Brief）》发表的研究论文。 若使用本数据集，请同时引用以下Mendeley数据集（Mendeley Data）及配套发表于《数据简报（Data in Brief）》的研究论文： 1. Juola, Jussi; Rautiainen, Miina; Hovi, Aarne (2025). 《七种寒带与温带树木枝条光谱库》. "Data in Brief", 112255. DOI: 10.1016/j.dib.2025.112255 2. Juola, Jussi; Rautiainen, Miina; Hovi, Aarne (2025). 《七种寒带与温带树木枝条反射光谱数据集》. Mendeley Data, V2. DOI: 10.17632/kvnx6vt8x9.2 版本历史：本数据集为V2版本，新增了配套《数据简报（Data in Brief）》发表论文的引用说明，数据内容与V1版本完全一致。