The vegetation canopy can be characterized using several different (but related) biophysical variables (i.e., vegetation water content (VWC) and biomass) as well as traditional remote sensing indices [i.e., normalized difference vegetation index (NDVI) and leaf area index (LAI)]. VWC is an important parameter in agricultural and forest studies and has been used for drought assessment and yield estimation [7], [8]. VWC is also of particular importance in retrieving soil moisture from remotely sensed microwave data [9], [10]. Previous studies have analyzed the relationship between NDVI (as well as other indices) and VWC and developed techniques to estimate VWC and other biophysical variables [9], [11].