Multispectral laser scanning: an overview Mark Danson & Fadal Sasse Ecosystems and Environment Research Centre, School of Environment and Life Sciences,

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Presentation transcript:

Multispectral laser scanning: an overview Mark Danson & Fadal Sasse Ecosystems and Environment Research Centre, School of Environment and Life Sciences, University of Salford, Manchester, Rachel Gaulton (U of Newcastle) Sanna Kaasalainen (FGI)

Structure of lidar waveforms Return pulse shape ƒ outgoing pulse shape, reflectance of object, area of material in beam, angle of incidence

Spectral measurements of foliage and woody material Oak leaves Woody components

Salford Advanced Laser Canopy Analyser

Wood only Leaf only Spectral separation of foliage and woody material with SALCA

Dual wavelength TLS for monitoring EWT of canopies

The FGI hyperspectral lidar (HSL) prototype Automatic 3D target identification in 8 channels (about nm) Supercontinuum laser light source: 1 ns pulses, 24kHz Spectrum directly available for each point in the laser scanning point cloud

Effects of laser incidence angle Incidence angle vs. reflectance varies between visible and NIR Variation in spectral vegetation indices, e.g., NDVI Zamioculcas, "Zanzibar Gem" (Zamioculcas zamiifolia) Kaasalainen, S., et al., Incidence angle dependency of leaf vegetation indices from hyper-spectral lidar measurements. PFG Photogrammetrie, Fernerkundung, Geoinformation, 2016, Heft 2, DOI: /pfg/2016/0287

Dual-wavelength terrestrial laser scanning of forest structure and composition Objectives: 1.Assess the spectral information in SALCA data in relation to tree species and composition 2.Use 3D spatial software (CANUPO) to assess the three-dimensional characteristics of point cloud data for tree components 3.Combine the spectral and spatial information in point cloud data to map forest characteristics Intensity – 1545nm Absolute reflectance

@SalcaSalford