DOI: 10.5061/dryad.kwh70rzfp
title: Data from: Scale-dependent responses to environmental fluctuations in tropical tree species’ crown temperatures

description: This dataset comprises tree crown temperature and tree crown trait data
 for four four canopy species in Laupahoehoe forest in Hawai'i,
 analyzed at a "crown" and "leaf" level, as defined in
 the manuscript methods. Climate data were collected from the
 climatological station at Laupāhoehoe Forest, and here we provide the
 average conditions at the 5 UAV flight times.
description: Data here were derived from spatial orthomosaics from five UAV
 flights with a 20 cm<sup>2</sup> pixel resolution were created
 for RGB, Thermal (°C), and lidar intensity with detailed methods described
 in the published manuscript. Tree crown temperature
 data: 652 crowns or leaf clusters were identified to four species: 396
 <em>Metrosideros polymorpha</em> (‘ōhi‘a lehua), 159
 <em>Acacia koa</em> (koa),<em> </em>51
 <em>Cheirodendron trigynum</em> (ʻōlapa), and 46
 <em>Coprosma rhynchocarpa</em> (pilo). Data were filtered to a
 "crown" and "leaf" level of analysis, described in
 detail in the manuscript, and thermal values from all remaining pixels
 were averaged to determine an average crown temperature at each flight
 time. Tree crown trait data: For each tree crown, we
 extracted average height (m), calculated the coefficient of variation (CV)
 of crown height (the ratio of standard deviation to mean height) within
 each crown as a measure of leaf clumping. We used the R package “lidR”
 (1-3) and the function “voxel_metrics” to derive average crown densities
 (pts m<sup>-3</sup>) and the function “rumple_index” to
 calculate the rumple index (a measure of rugosity or roughness) for each
 crown.  1.     R Core Team. (2023). <em>R: A
 language and environment for statistical computing </em>(Version
 4.1.3)<em>. </em>R Foundation for Statistical Computing. https://www.R-project.org/ 2.     J.R. Roussel, D. Auty, N.C. Coops, P. Tompalski, T.R.H. Goodbody, A. Sanchez Meador, J.F. Bourdon, F. De Boissieu, A. Achim, lidR: An R package for analysis of Airborne Laser Scanning (ALS) data. <em>Remote Sensing of Environment</em> <strong>251</strong>, 112061 (2020). Doi:10.1016/j.rse.2020.112061 3.     J.R. Roussel, D. Auty, Airborne LiDAR Data Manipulation and Visualization for Forestry Applications (2022). R package version 4.0.1. https://cran.r-project.org/package=lidR
description: # Hawaiian tree species’ crown temperatures and crown traits
 [https://doi.org/10.5061/dryad.kwh70rzfp](https://doi.org/10.5061/dryad.kwh70rzfp) ## Description of the data and file structure Data for the manuscript titled "Scale-dependent responses to environmental fluctuations in tropical tree species’ crown temperatures," by Bayliss et. al., for *Communications Earth & Environment.* ### Files and variables #### File: Abiotic\_Conditions\_DRYAD.csv **Description:**  ##### Variables * DMY: Day, Month, and Year of Data Collection * flight_time: Approximate Flight Times of Data Collection (Time marking beginning of UAV flight) * Tair_Celcius: Air Temperature in degrees Celcius * WS_mph: Wind Speed in miles per hour * Rn_Wm-2: Net Radiation in Watts per meter squared * VPD_Pa: Vapor Pressure Deficit in Pascals #### File: Crown\_Temperatures\_DRYAD.csv **Description:**  ##### Variables * species: Species names, coded as METPOL = *Metrosideros polymorpha*; ACAKOA = *Acacia koa*; CHETRI = *Cheirodendron trigynum;* COPRHY= *Coprosma rhynchocarpa*. * UAV-flight-time: Approximate Flight Times of Data Collection (Time marking beginning of UAV flight) * crown.reference: unique identifying crown identification number * level-of-analysis: whether temperature averages (of pixels) were conducted at the "crown" or "leaf" level * thermal.mean.Celcius: crown temperatures in degrees Celcius * thermal.sd: crown temperatures standard deviation * tdiff.mean: crown temperature deviations from air temperatures in degrees Celcius * tdiff.sd: crown temperature deviations from air temperatures standard deviation #### File: Crown\_Traits\_DRYAD.csv **Description:**  ##### Variables * crown.reference: unique identifying crown identification number * species: Species names, coded as METPOL = *Metrosideros polymorpha*; ACAKOA = *Acacia koa*; CHETRI = *Cheirodendron trigynum;* COPRHY= *Coprosma rhynchocarpa*. * Z_mean_height_m: average crown height in meters * rumple_index: measure of crown rugosity/roughness: crown rumple index value (no unit) * leaf_clumping: coefficient of variation (CV) of crown height (the ratio of standard deviation to mean height) * mean_density_voxels: crown densities (pts m-3) from 3D point densities from Lidar point clouds ## Code/software These data can be opened in Microsoft Excel, or any software that reads .csv files