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A Multispectral Canopy LiDAR Demonstrator Project

A Multispectral Canopy LiDAR Demonstrator Project,10.1109/LGRS.2011.2113312,IEEE Geoscience and Remote Sensing Letters,Iain H. Woodhouse,Caroline Nich

A Multispectral Canopy LiDAR Demonstrator Project  
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The first demonstration of a multispectral light de- tection and ranging (LiDAR) optimized for detailed structure and physiology measurements in forest ecosystems is described. The basic principle is to utilize, in a single instrument, both the capac- ity of multispectral sensing to measure plant physiology (through normalized difference vegetation index (NDVI) and photochemical reflectance index (PRI)) with the ability of LiDAR to measure vertical structure information and generate "hot spot" (specular) reflectance data independent of solar illumination. A tunable laser operated at four wavelengths (531, 550, 660, and 780 nm) was used to measure profiles of the NDVI and the PRI. Laboratory-based measurements were conducted for live trees, demonstrating that realistic values of the indexes can be measured. A model-based analysis demonstrates that the LiDAR waveforms cannot only capture the tree height information but also picks up the seasonal and vertical variation of NDVI inside the tree canopy. Index Terms—Forest canopy, multispectral light detection and ranging (LiDAR), normalized difference vegetation index (NDVI).
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