Flying eye maps rain forest's health

 作者:罗郓闼     |      日期:2019-03-09 02:09:07
AN IMAGING device is being used to assess the plant diversity within a rainforest without setting foot there. Greg Asner, an ecologist at the Carnegie Institution in Washington DC, is developing it as a way of measuring deforestation, and the damage done by logging. Asner uses a laser scanner linked to a spectrometer on board an aircraft to fire visible light towards the ground and analyse the wavelengths that are reflected from the leaves. This generates a three-dimensional map of the chemical composition of the trees, from the canopy to the forest floor,