Research Note No. 34 September 16, 1991
The forest Stand Generator, STAG, estimates missing tree heights, height-to- crown base measurements, or both to produce complete stand descriptions comprised of complete individual tree records (height, diameter, live-crown- ratio, species, and tree expansion factor) for use in the conifer growth and yield simulator, CACTOS. Complete stand descriptions are also produced from stand tables or from the summary statistics of elevation, basal area and number of trees per acre by species. By producing a complete stand description, STAG ensures that most forms of inventory data can be analyzed by CACTOS to estimate future growth and yield under a wide array of silvicultural regimes and management instruments.
This document and associated software were prepared as part of a project under the auspices of the University of California. Neither the University of California nor any of its employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, product, or process disclosed. Reference herein to any specific commerical product, process or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the University of California. The veiws and opinions of authors expressed here do not necessarily state those of the University of California, and shall not be used for advertising or product endorsement purposes.
American Forest Products Corp. The Hearst Corp. W.M.Beaty and Associates, Inc. Louisiana-Pacific Corp.(Elk Creek) Champion International Corp. Louisiana-Pacific Corp.(Feather Falls) Crane Mills Michigan-California Lumber Co. Fiberboard Pacific Gas and Electric Co. Fruit Growers Supply Co. Roseburg Resources Co.(Diamond Lands) Georgia Pacific Corp.(Martell) Sierra Pacific Industries USDA Forest Service (R5) CA Dept. of Forestry & Fire Protection Research conducted under AES project 3679-MS.
The STAG program represents the collective efforts of many people over eight years. This work would not have been accomplished in a timely manner without the financial and technical support of the industry cooperators listed on previous page or without our new agency cooperators. The specification for the design of this study was guided, in a large part, by the industrial cooperators to take into account the type and quality of information that would be available to run STAG. We would like to thank Dr. Paul C. Van Deusen, who is now at the Southern Forest Experiment Station in New Orleans, for sharing the responsibilities of formulating the procedures used to "fill in" missing data and for generating information based upon readily supplied summary statistics. Much of the theoretical work that is used as a basis for STAG's models and routines was developed as part of Paul's Ph.D. dissertation at Berkeley. Paul was also responsible for doing much of the original programming of the first version of STAG. Paul's excellent wotk and contributions to this project should be evident to anyone familiar with this work. We also would like to thank our friend and colleague Dr. Lee C. Wensel who provided valuable input on how this simulator could best be structured to maximize its utility and function. Many good people have worked on this project who have had a direct bearing on the quality of the project. Peter J. Daugherty improved the computer coding and helped develop the user's guide and sample runstreams of version 2.0 of STAG. Vaughn Landrum assisted Peter in improving the computer program and helped develop the routine that allows merchantable height to be inputted to STAG. To these people our sincere thanks for a job well done. Greg S. Biging Walter J. Meerschaert Timothy A. Robards Eric C. Turblom
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