DOI: 10.5281/zenodo.4497750
title: Terrestrial lidar data collected from one hectare of tropical rainforest in Réserve Naturelle des Nouragues

description: Title<br> -----<br> Terrestrial lidar data collected from one hectare of tropical rainforest in Réserve Naturelle des Nouragues Overview<br> -----<br> Terrestrial lidar data were acquired from one hectare of intact old-growth tropical rainforest in Réserve Naturelle des Nouragues, French Guiana, during November 2015. This dataset contains the preprocessed lidar data (the raw lidar data are available at https://zenodo.org/record/4497751). Forest geography and type<br> -----<br> These data were collected close to the Station des Nouragues (https://nouragues.cnrs.fr), from a long-term censused 1 ha forest stand (code: NOU-11 / Nouragues Petit Plateu 20H; dimensions: 100 m x 100 m; see http://rainfor.org and https://forestplots.net). The approximate coordinates of the site in the WGS-84 datum are 4.08, -52.68 degrees. The site is classified as moist, terra firme, pre-quaternary, lowland, mixed species, old-growth, intact tropical forest. Acquisition<br> -----<br> These data were collected using a REIGL VZ-400 terrestrial laser scanner. Scans were acquired at 121 locations on a 10 m Cartesian grid cast across the 1 ha plot, with the first and last scan location at the plot 0 m, 0 m and 100 m, 100 m x,y coordinates respectively. An upright and tilt scan was acquired at each location to capture a complete sample of the scene. The angular step between sequentially fired pulses was 0.04 degrees, The laser pulse has a wavelength of 1550 nm, a beam divergence of 0.35 mrad, and the diameter of the pulse at emission is 7 mm. The instrument was in ‘High Speed Mode’ (pulse repetition rate: 300 kHz), ‘Near Range Activation’ was off (minimum measurements range: 1.5 m), and waveforms were not stored. 10 targets (cylinders) covered in retroreflective tape (diameter: 54 mm, length: 100 mm) were placed between locations for scan registration purposes. The scanner was mounted on a surveyor's tripod, and the height of the instrument above-ground varied between locations. File format<br> -----<br> The lidar data are stored in binary PCD format (point type: pcl::PointXYZ). Processing<br> -----<br> The PCD files were generated from the raw lidar data using the rxp2pcd executable available in treeseg (v0.2.1), called as: rxp2pcd ../data/ NOU11_coords.dat 25 15 NOU11 That is, points inside the bounding box (whose dimensions were specified by the plot boundaries and extended in each direction by 20 m), and whose deviation value (a proxy for range estimate goodness) was less than or equal to 15, were stored into individual tiles of 25 m<sup>2</sup> area. File directory and naming convention<br> -----<br> ./<br> ├───NOU11.tile.0.pcd<br> ├───NOU11.tile.N.pcd<br> ├───NOU11.tile.869.pcd Authors<br> -----<br> A. Burt<br> M. Disney Contact<br> -----<br> a.burt@ucl.ac.uk Acknowledgements<br> -----<br> Collection of these data was funded by Natural Environment Research Council (NERC) grants NE/N00373X/1 and NE/J016926/1, and the CNRS Nouragues Travel Grants Program. We gratefully acknowledge Jéróme Chave and Blaise Tymen. License<br> -----<br> These data are distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC BY 4.0).