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.

Video Data 

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)

Accelerometer Data

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:

1. datetime index (in CDT)
2. acc - single‐axis acceleration filtered through a low‐pass filter from 0.01 to 2 Hz

Sway Frequency Data

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:

1. name - name of video sample
2. datetime - start time of video sample
3. vvs_avg_hz - frequency (Hz) of tree extracted using VVS method with average spectrum aggregation
4. vvs_hist_hz - frequency (Hz) of tree extracted using VVS method with peak frequency histogram aggregation
5. mbt_avg_hz - frequency (Hz) of tree extracted using MBT method with average spectrum aggregation
6. acc_60sec_hz - frequency (Hz) of tree extracted from an accelerometer segment with the same start time and duration as the video
7. acc_30min_hz - frequency (Hz) of tree extracted from a 30-minute accelerometer segment centered on the video start time