Video and accelerometer tree sway data for two ponderosa pine trees in the Manitou Experimental Forest, Colorado

This repository includes video, accelerometer, and sway frequency data for two ponderosa pine trees (Pinus ponderosa, PIPO) in the Manitou Experimental Forest in Colorado. Video and accelerometer samples were selected from data recorded between May and September 2020. Sway frequency data for both trees was extracted from both video and accelerometer data using the methods described in Ammatelli et al. (In review).

All times are in Mountain Daylight Time.

Video Data 

The three, 30 s videos were recorded using a video camera attached to the top of a nearby tower. 

Video camera: GoPro camera, 30 fps, 1080p resolution, 155° FOV

Approximate pixel bounding boxes (ymin, ymax, xmin, xmax):

1. Tree 1: (440, 520, 395, 425)
2. Tree 2: (400, 575, 690, 760)

File naming convention: manitou-X.MP4 where X the video ID (a,b,c)

Date and time

• manitou-a.MP4 (2020-8-15 12:05:58)
• manitou-b.MP4 (2020-8-20 17:28:9)
• manitou-c.MP4 (2020-8-31 11:50:20)

Accelerometer Data

Accelerometer data for both trees was recorded using a 3-axis accelerometer. The accelerometers were positioned ~6-8 m above the ground (total tree height ~8-10 m).

Accelerometer: Gulf Coast Data Concepts 2g MEL-X2,16 Hz continuous sampling

File naming convention: manitou_accelerometer_X_treeY.csv where X is the video ID (a,b,c) and Y is the tree number (1,2)

Variables:

1. datetime - time of acceleration sample (MDT)
2. Ax - raw acceleration along X-axis of sensor
3. Ay - raw acceleration along Y-axis of sensor
4. Az - raw acceleration along Z-axis of sensor

Sway Frequency Data

For each video and tree, 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.

File naming convention: manitou_sway_treeY.csv where Y is the tree number (1,2)

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. acc_30sec_hz - frequency (Hz) of tree extracted from an accelerometer segment with the same start time and duration as the video
6. acc_30min_hz - frequency (Hz) of tree extracted from a 30-minute accelerometer segment centered on the video start time

See the below paper for more information.

Bush, S. A. (2022). Ecohydrologic Processes in the Montane Headwaters of the Upper South
Platte River (Doctoral dissertation). Retrieved from ProQuest Dissertations Publishing. (cub.b12869881). Boulder, CO: University of Colorado at Boulder.