Published August 11, 2021 | Version 1.0.0
Dataset Open

Multi-year measurements of tree motion from an accelerometer on a spruce tree near Niwot Ridge, Colorado

  • 1. Oregon State University

Description

This repository includes 12 Hz three-axis acceleration data from an accelerometer mounted to the bole of a Picea engelmannii (engelmann spruce) next to the C-1 Ameriflux tower at Niwot Ridge LTER, Colorado, USA. The data were recorded from November 2014 through August 2020. More information on the installation can be found in Raleigh et al. (in review, Water Resources Research).

The data are stored in netCDF files, chunked based on the collection date when the data were downloaded from the accelerometer.

File metadata:

Filename

GCDC_L01_Raw_Data_Niwot_TreeXX_collection_YYYYMMDD.nc

where

XX = tree number (01 = spruce, 02 = fir)

YYYYMMDD = year (YYYY), month (MM), and day (DD) of data collection

 

Each netCDF includes four variables:

1. serial_date = time increment (fractional days), as defined by Matlab: "A serial date number represents the whole and fractional number of days from a fixed, preset date (January 0, 0000) in the proleptic ISO calendar." The serial dates are in mountain standard time (MST) with no adjustments for daylight savings.

2. Ax = acceleration in the vertical direction (counts)

3. Ay = acceleration in the east-west direction (counts)

4. Az =  acceleration in the north-south direction (counts)

To convert the "counts" unit to gravitational units (g), divide Ax, Ay, and Az each by 2048, as explained in the manufacturer's user manual.

 

 

Files

Files (44.5 GB)

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Additional details

Funding

Improved process understanding of snow density and SWE across forested mountain landscapes from coordinated field observations and model analyses 1761441
National Science Foundation