Retrieval of Leaf Area Index Using Inversion Algorithm

With the development in sensor technology, there is a spectroradiometer with resolution as high as 1nm and data capture extending from 350nm-2500nm; it helps in viewing spectral variability of the subject of interest. The advantage of such instruments opens up many opportunities for the development of hyperspectral data analysis in precision agriculture. In the presented work, estimation of Leaf Area Index (LAI) is done with inversion technique using Transformed Vegetation Index (TVI), SR (Simple Ratio), NDVI (Normalized difference ratio index) vegetation indices as input parameters, and modeled LAI separately for these three indices. The estimation was done for different growth stages of Maize (Zea mays), Mustard (Brassica), pink Lentils (Lens esculenta), and Wheat (Triticum). A comprehensive comparative analysis was done based on the value of R
²
. For the variation in LAI, the SR index gave the highest correlation for lentils (R
²
=0.9329), Mustard (R
²
=0.893), and wheat (R
²
=0.9712) whereas, for Maize, NDVI was found to be the best estimator with a correlation of (R
²
=0.7781).