CROGRO is an interactive computer model that simulates crown growth in trees as they compete with each other for available space and light. The model contains growth data for six species of trees. CROGRO was designed to be used as a teaching aid. It allows forestry students to observe in a few minutes a process which, in the real world, occurs over several decades. The system is programmed in APL, and input/output is via a Tektronix 4015 graphics display terminal.
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