Towards universal biological structural assessment of forests with LiDAR remote sensing for vegetation monitoring in a changing world

• Grant number: 17/03867-6
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: September 03, 2017
• End date: March 02, 2018
• Field of knowledge: Agronomical Sciences - Forestry Resources and Forestry Engineering
• Principal Investigator: Pedro Henrique Santin Brancalion
• Grantee: Danilo Roberti Alves de Almeida
• Supervisor: Scott Christopher Stark
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Institution abroad: Michigan State University (MSU), United States
• Associated to the scholarship: 16/05219-9 - Monitoring forest landscape restoration through Light Detection and Ranging (LiDAR)., BP.DR

Abstract

Many studies use small footprint LiDAR technology to estimate canopy structure variables,such as forest height, leaf area vertical profiles and biomass stocks, for use in ecologicalmonitoring and modeling. Thus, it is critical to develop universal approaches to estimate theseforest structural parameters from LiDAR to allow comparison among LiDAR devices, surveysconducted under different conditions, and different vegetation types. However, universal modeldevelopment is difficult because of the fundamentals of LiDAR data, which consist of a 'pointcloud' of accurate laser pulse reflection locations in space, with the density of pulses varyingfrom a few to hundreds per horizontal meter-squared. The fundamental challenge lies inrecovering structural variable estimates over variation in pulse density (and potentiallyadditional survey characteristics); many current approaches do not fully address this challenge,instead relying on survey or device-specific metrics that are not intuitive and difficult tobiologically interpret as proxies for biological structural parameters. I propose to investigatehow this key element of variation in LiDAR survey impacts our estimation of biologicalvariables of forest canopy structure, such as the leaf area index and leaf area density along the2vertical profile. My project will improve understanding of how to statistically model the linksbetween biological forest structure and LiDAR point clouds, and improve the accuracy andcomparability of important fundamental LiDAR forest monitoring approaches, particularlyrelated to leaf are and stand structure.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ALVES DE ALMEIDA, DANILO ROBERTI; STARK, SCOTT C.; SHAO, GANG; SCHIETTI, JULIANA; NELSON, BRUCE WALKER; SILVA, CARLOS ALBERTO; GORGENS, ERIC BASTOS; VALBUENA, RUBEN; PAPA, DANIEL DE ALMEIDA; SANTIN BRANCALION, PEDRO HENRIQUE. Optimizing the Remote Detection of Tropical Rainforest Structure with Airborne Lidar: Leaf Area Profile Sensitivity to Pulse Density and Spatial Sampling. REMOTE SENSING, v. 11, n. 1, JAN 1 2019. (17/03867-6, 16/05219-9)

SHAO, GANG; STARK, SCOTT C.; DE ALMEIDA, DANILO R. A.; SMITH, MARIELLE N.. Towards high throughput assessment of canopy dynamics: The estimation of leaf area structure in Amazonian forests with multitemporal multi-sensor airborne lidar. REMOTE SENSING OF ENVIRONMENT, v. 221, p. 1-13, FEB 2019. (17/03867-6, 16/05219-9)