@article{fdi:010094336,
  title = {{U}sing high penetration airborne {L}i{DAR} and dense {UAV} scanning to produce accurate 3{D} maps of light availability in dense tropical forest},
  author = {{B}adouard, {V}. and {V}erley, {P}hilippe and {B}ai, {Y}uchen and {S}ellan, {G}. and {F}ran{\c{c}}oise, {L}. and {M}arcon, {E}. and {D}erroire, {G}. and {V}incent, {G}r{\'e}goire},
  editor = {},
  language = {{ENG}},
  abstract = {{L}i{DAR} makes it possible to describe the 3{D} structure of the forest, from which species habitats can be accurately estimated, over large areas at fine resolution. {H}owever, standard airborne laser scanning ({ALS}) fails to describe the lower canopy in sufficient detail due to occlusion by the upper canopy. {T}he understory is important to characterise as it harbours the majority of the forest community and is the place where regeneration takes place. {H}ere we explored the potential of low altitude high power {ALS} with enhanced penetration, and denser {UAV} {L}i{DAR} ({U}nmanned {A}erial {V}ehicle) to describe the structure of the understory. {W}e used the recorded laser pulse extinction to build a 3{D} model of light transmission through the canopy. {W}e evaluated the capacity of the light transmission model to estimate the spatial and angular variation of light in the tropical understory, considering different leaf inclination distribution functions ({LIDF}), compared with measurements from two different field sensors. {W}e found that (i) {L}i{DAR} can be used to estimate the light environment in the understory in a spatially and angularly consistent way; (ii) high pulse density does not guarantee an accurate characterization of the forest structure, and penetration rate is an important characteristic to accurately describe the forest structure, especially the understory; (iii) taking into account the anisotropic nature of light transmittance improved the estimation of absolute light levels by radiative transfer.},
  keywords = {{U}nderstory light ; {L}ight transmittance anisotropy ; {R}aytracing model ; {ALS} ; {UAV} ; {V}ertical light extinction profile ; {AMAPV}ox ; {GUYANE} {FRANCAISE}},
  booktitle = {},
  journal = {{A}gricultural and {F}orest {M}eteorology},
  volume = {373},
  numero = {},
  pages = {110713 [12 p.]},
  ISSN = {0168-1923},
  year = {2025},
  DOI = {10.1016/j.agrformet.2025.110713},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094336},
}