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SADfLOR is a complete decision support system (DSS) that integrates an information system, a supply driven stand level forest simulator and several optimization tools to support forest management planning: a) A forest management database - INfLOR - that characterizes the forest areas to be considered for simulation (Miragaia 1998). The set of forest stands to be simulated is defined through an implicit query triggered as the study area is selected. b) A platform for the definition of the forest management alternatives/prescriptions for the main tree species in Portugal that represent the base for the simulation of forest management alternatives. c) A prescription driven stand level forest simulator – StandSim – that integrates a set of different forest growth and yield models for the most important Portuguese tree species allowing the growth simulation under different user-defined management scenarios (Tomé et al 2013). Simulation results are of two types: - Detailed characterization of stands’ growth and yield for the planning horizon; - Essential information required to run the decision models. d) An optimization module that encapsulates exact mathematical techniques (Mixed Integer programming, Linear Programing and Goal programming) and Heuristics. The model generator reads outputs from the stand simulator (e.g. harvest volumes) and financial data from the management information module (i.e. interest rate, prices and costs) and creates the coefficients for all needed equations in the problem formulation. Interface with the user is provided through input forms that allow for the specification of the objective function and constraints that define the management problem. Links with external solvers (i.e. commercial software CPLEX and the freeware GLPK) are programmed in the optimisation module in order to solve the mathematical models. Alternatively the system may use a metaheuristic to solve the problem without need to use any external solver. e) A solution report module allows the user to analyse results in different formats (e.g. tables, graphs and maps). f) A graphical user interface to support and guide the access to all modules of the DSS.
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