Spectroradiometer measurements have concluded that surface parameters, for example, LAI, are related to radio-metric measurements. Thus, LAI can be estimated from the radiometric information through an empirical relationship or a physical model inversion. The following section discusses general methods to estimate LAI from remotely sensed data. In comparison to the ground measurement method, remote-sensing method provides a practical method to estimate LAI at a large area with high temporal coverage.
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