Deriving forest canopy parameters for backscatter models using the AMAP architectural plant model

A new approach using an architectural plant model to feed various theoretic al scattering models is presented as a better interpretation of future remo te sensing data acquired over natural media. The method is based on the arc hitectural plant model (AMAP), which integrates knowledge of botanical grow th processes and real plant measurements. AMAP is encapsulated in a flexibl e interface software called AMAP2SAR that allows us to 1) simulate a three- dimensional (3-D) plant such as a tree, 2) transform the tree into a collec tion of cylinders, and 3) feed theoretical models such as radiative transfe r (RT) models. The method is illustrated by an example of Austrian black pi ne plantations in southern France. Simulated characteristics of black pines are validated for stands up to 50 years old and for a given environment. T he results show the ability to derive classical forest parameters as well a s those needed for electromagnetic models (such as geometry) as a function of age. Vertical profiles of canopy elements are derived and point out the vertical heterogeneity of the stands after they are 20 years old for parame ters having an impact on the backscatter such as diameter and number of bra nches. Consequently, the crown layer variability with age and canopy depth should be considered in RT models. Thus, in quoted and joint papers, an RT model is modified in order to take account of accurate canopy descriptions and deal with encouraging modeling results at C- and L-band over the same t est site.