Video and accelerometer tree sway data for an oak tree in Trout Lake, Wisconsin

This repository includes video, accelerometer, and sway frequency data for a red oak tree (Quercus rubra) in the Trout Lake Watershed in northern Wisconsin. Video and accelerometer data were recorded on 15 August 2019. Sway frequency data was extracted from both video and accelerometer data using the methods described in Ammatelli et al. (In review). All times are in Central Daylight Time. <strong>Video Data </strong> The five, 60 s videos were recorded using a video camera fastened with straps to the base of an adjacent tree. Video camera: Bushnell TrophyCam, 30 fps, 1080p resolution, 45° FOV File naming convention: trout-X.MP4 where X (a,b,c,d,e) is the video ID Date and time trout-a.MP4 (2019-8-15 17:07:18) trout-b.MP4 (2019-8-15 17:30:01) trout-c.MP4 (2019-8-15 17:32:34) trout-d.MP4 (2019-8-15 18:00:01) trout-e.MP4 (2019-8-15 18:09:06) <strong>Accelerometer Data</strong> Accelerometer data for the same tree was recorded using a 3-axis accelerometer. The accelerometer was positioned beneath the main branching of the target tree at ~8 m (total tree height ~22 m). Accelerometer: Gulf Coast Data Concepts 2g MEL-X2,16 Hz continuous sampling Filename: trout_accelerometer.csv Variables: datetime index (in CDT) acc - single‐axis acceleration filtered through a low‐pass filter from 0.01 to 2 Hz <strong>Sway Frequency Data</strong> For each video, the tree's sway frequency was extracted from the video and two lengths of accelerometer data: a segment with the same start time and duration as the video and a 30-minute segment. Filename: trout_sway.csv Variables: name - name of video sample datetime - start time of video sample vvs_avg_hz - frequency (Hz) of tree extracted using VVS method with average spectrum aggregation vvs_hist_hz - frequency (Hz) of tree extracted using VVS method with peak frequency histogram aggregation mbt_avg_hz - frequency (Hz) of tree extracted using MBT method with average spectrum aggregation acc_60sec_hz - frequency (Hz) of tree extracted from an accelerometer segment with the same start time and duration as the video acc_30min_hz - frequency (Hz) of tree extracted from a 30-minute accelerometer segment centered on the video start time本数据集仓库包含美国威斯康星州北部鳟湖流域内一株北美红栎（Quercus rubra）的视频、加速度计（accelerometer）与摇摆频率数据。视频与加速度计数据采集于2019年8月15日，摇摆频率数据则通过Ammatelli等人（审稿中）所述方法从视频及加速度计数据中提取得到。所有时间均采用中部夏令时（CDT）。 <strong>视频数据</strong> 本数据集包含5段时长60秒的视频，均通过捆绑于邻近树干的摄像机录制。摄像机参数：Bushnell TrophyCam品牌，帧率30 fps，分辨率1080p，视场角45°。文件命名规则为trout-X.MP4，其中X（a、b、c、d、e）为视频ID。各视频的日期与时间信息如下： trout-a.MP4（2019-8-15 17:07:18） trout-b.MP4（2019-8-15 17:30:01） trout-c.MP4（2019-8-15 17:32:34） trout-d.MP4（2019-8-15 18:00:01） trout-e.MP4（2019-8-15 18:09:06） <strong>加速度计数据</strong> 本数据集包含目标红栎的三轴加速度计（3-axis accelerometer）采集数据。加速度计安装于目标树主分枝下方约8米处（该树总高度约22米）。设备参数：Gulf Coast Data Concepts 2g MEL-X2型号，连续采样频率16 Hz。文件名：trout_accelerometer.csv。数据变量包括： datetime：以中部夏令时为基准的时间索引 acc：经0.01~2 Hz低通滤波器滤波后的单轴加速度值 <strong>摇摆频率数据</strong> 针对每段视频，分别从该视频本身、两段加速度计数据中提取目标树的摇摆频率：一段为与该视频起始时间、时长均一致的加速度计片段，另一段为30分钟时长的加速度计片段。文件名：trout_sway.csv。数据变量包括： name：视频样本的名称 datetime：视频样本的起始时间 vvs_avg_hz：通过平均频谱聚合的VVS方法提取得到的树木摇摆频率（单位：Hz） vvs_hist_hz：通过峰值频率直方图聚合的VVS方法提取得到的树木摇摆频率（单位：Hz） mbt_avg_hz：通过平均频谱聚合的MBT方法提取得到的树木摇摆频率（单位：Hz） acc_60sec_hz：从与该视频起始时间、时长均一致的加速度计片段中提取得到的树木摇摆频率（单位：Hz） acc_30min_hz：从以该视频起始时刻为中心的30分钟时长加速度计片段中提取得到的树木摇摆频率（单位：Hz）