Multi-angular reflectance spectra of small single trees

• Published in: Remote sensing of environment 2021-03, Vol.255, p.112302, Article 112302
• Main Authors: Forsström, Petri R., Hovi, Aarne, Ghielmetti, Giulia, Schaepman, Michael E., Rautiainen, Miina
• Format: Article
• Language: English
• Subjects: Anisotropy; Bark; Goniometer; Information retrieval; Leaves; Oak; Picea abies; Pine; Pine needles; Pine trees; Pinus sylvestris; Plant species; Reflectance; Remote sensing; Scattering; Species; Spectra; Spruce; Tree spectrum; Trees
• ISSN: 0034-4257; 1879-0704
• DOI: 10.1016/j.rse.2021.112302

Understanding the reflectance anisotropy of forests and the underlying scattering mechanisms is needed to improve the accuracy of retrievals of fundamental forest characteristics from optical remote sensing data. In this paper, we developed a laboratory measurement set-up for a large goniometer (LAGOS) and measured multi-angular spectra (350–2500 nm) of 18 small trees, composed of three common European tree species: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst), sessile oak (Quercus petraea (Matt.) Liebl.). For all trees, we measured tree spectra in 47 view angles in the upper hemisphere. To our knowledge, this is the first study reporting multi-angular reflectance spectra of single trees. We also measured the reflectance and transmittance spectra of needles and leaves, as well as reflectance spectra of bark of the sample trees. We analyzed the spectro-directional characteristics of the trees, and the inter- and intraspecific variations of these characteristics. The anisotropy of trees was shown to be strongly asymmetrical and characteristic to species: while pine and spruce exhibited strong hotspot effects, oak showed a strong specular component. Our results indicate that simultaneous measurements of both spectral and directional characteristics of trees may enhance the discrimination of species and thus, support the retrieval of information of their biophysical properties. •First multi-angular spectra (350–2500 nm) of single trees•Developed a lab set-up for small trees using a goniometer.•Tree species scattered similarly backwards and differently elsewhere.•Information on spectro-directional properties may enhance tree species discrimination.