Abstract
Problems associated with transporting cumbersome, batch-run FORTRAN programs to an interactive microcomputer platform are common to many projects in ecological modelling. We describe the experience of modifying and enhancing ZELIG, a simulation model of forest stand dynamics, for use as a silvicultural planning tool. The overall strategy was to embed the original model within an interactive, programmable graph plotting package. We use a simple interpreted language, with specialised primitives to access internal model data structures, to control model execution and to define and display graphs of model output. These techniques, and our methods of performance optimization and FORTRAN to C conversion, are applicable to simulation models in general. The specification of complex manipulations of model data (representing stand thinning and harvesting operations) is demonstrated.
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