Completed field LAI measurements using the new LAI-2000’s made available through Sue and Paul from IPIF. A total of 65 good points georeferenced to within 10 cm XYZ. Now I am using an offset IDL program to extract hyperspectral and LiDAR information for each pixel LAI location which I will input into a statistics program (JMP) to compare methods for LAI calculation, including simple vegetation indices and more advanced radiative transfer approaches. One of the main issues I am dealing with is how to minimize the shade resulting from canopy topography. Even ‘normalized’ indices, which use ratios to remove much of this effect, do not do a perfect job. First, I will look into how different spectral bands relate to canopy shade positions and see if it is possible to regress shade out of the spectra prior to running indices.
LAI variation 1-8 with all fixed parameters.
Dealing with a few floating underflow errors in prosail when sun or observer angle are greater than 85 degrees
