This report describes and documents the OpCost forest operations cost model, a key component of the BioSum analysis framework. OpCost is available in two editions: as a callable module for use with BioSum, and in a stand-alone edition that can be run directly from R. OpCost model logic and assumptions for this open-source tool are explained, references to the literature used in all of the submodels included in OpCost are provided, and guidance is offered on how to change the default hourly machine rates associated with overall logging cost calculations. OpCost enhancements such as cost component breakout, and identifying the least-cost harvest system, are also described and explained.
Bell, Conor K.; Keefe, Robert F.; Fried, Jeremy S. 2017. OpCost: an open-source system for estimating costs of stand-level forest operations. Gen. Tech. Rep. PNW-GTR-960. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station 23 p.