Context. The JAXA asteroid sample return mission Hayabusa2 acquired a huge quantity of data from the (162173) Ryugu during its 1.5 years in proximity orbit. On December 5, 2020 (Japan time), Hayabusa brought back to Earth 5.4 g Ryugu’s surface. Aims. We analyzed near-infrared spectra Ryugu, particular band at 2.72 μm, with aim investigate hydrogen content H 2 O and OH − groups hydrated phyllosi...

It is widely accepted that distributions of plants and animals are broadly constrained by their physiological tolerances to climatic factors (Woodward, 1987, 1990). This generalization is held to be true for species at a variety of spatial scales (Whittaker et al., 2001), although there is a wide recognition that the importance of climate is best expressed at large spatial scales (Rahbek & Grav...

Many trait-based plant investigations have neglected the intraspecific trait variations. A lot of ecologists consider that this is unreasonable, because intraspecific variation significantly affects various ecological dynamics. However, it is not feasible to record the traits of each plant individually at every community site. Therefore, the aim of this study was to determine in which circumsta...

The estimation of abundance maps in hyperspectral imaging requires the resolution of an optimization problem under non-negativity and full-additivity (sum to one) constraints. Assuming that the spectral signatures of the image components have been previously determinated by an endmember extraction algorithm, we propose in this paper a primal-dual interior point algorithm for the estimation of t...