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Linda Joyce
Rocky Mountain Research Station
240 West Prospect
Fort Collins, CO 80526
Phone: 970-498-2560
 United States Department of Agriculture Forest Service.USDA logo which links to the department's national site.Forest Service logo which links to the agency's national site.

Computer Programs  

     On this page you will find data-based computer programs that can be used to visualize composition, growth, and proposed management alternatives in forested ecosystems.  Most were written by Wayne D. Shepperd at the U. S. Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort collins, CO.  These programs were written in BASIC, then converted to executable files.  To use them, type the program name and press return if you are using DOS, or double-click on the *.EXE file in Windows.  Some programs are interactive and others require data files.  Example data, documentation, and output files are included for some programs and have similar names, but with .DAT, .TXT, and .OUT extensions. Most programs also tell you what variables are needed in a data file when you run them. NOTE, program files and data files must be in the same directory to run properly.  



Unless specifically noted, programs require all numeric data in sequential order separated by one or more blanks.  No empty fields are allowed.  Use zero's for missing data.  The end of file marker must be at the end of the last line of data, not at the beginning of a new line.


If you are unfamiliar with BASIC, the following commands will help you if a program hangs up, or if you want to stop it.  When an error is encountered, BASIC prints an error message, followed by an "OK".  To get back to DOS when this occurs, type SYSTEM, then press [Enter].  If you want to stop a program while it is running, press
Ctrl-Break] to get the "OK" message.  Running these programs in Windows may require closing the window to exit.



NOTE: To read .TXT or DAT files, simply click on the filenames below. To download .TXT or .DAT files, press SHIFT while clicking over the filenames to bring up a Save As window.   .EXE files will automatically bring up Save As windows when their names are clicked.
  • ASPENCLS - Classifies aspen stands based on stand growth characteristics and displays possible management considerations.  
  • GENGYM - Growth and yield model which projects expected stand conditions in southwestern mixed conifer and ponderosa pine stands, including the effects of dwarf mistletoe.  Stand management options include both even- and uneven-aged cutting methods. (Edminster et al. 1990. USFS Res. Pap. RM-297).
    • ggymzip.exe (167 KB; self-extracting compressed files; expands to 12 f iles totalling 410 KB)
  • GRAFFVS -Illustrates the forest conditions predicted by all variants of the Forest Vegetation Simulation (FVS) forest growth and yield modeling system.
    • grafzip.exe  (186 KB; self-extracting compressed files; expands to 28 files totalling 525 KB)
  • GRAFGYM - Draws crown profiles of the model output produced by GENGYM.  Can be downloaded as part of the GENGYM program suite.
  • PHOTOWRK - Scales aerial photos from USGS topo maps, adjusts scale to any elevation, and computes acreage of areas measured on a photo, or a map.  
  • PLOTVIEW - Helps the user visualize growth and stocking patterns in mature subalpine forests in the central and southern Rockies.  Especially useful to view plot characteristics without the influence of the surrounding forest and is very helpful in visualizing species composition, recruitment, mortality, successional patterns, and other attributes not readily apparent in tabular inventory data.  
  • QSTAND - (Requires VGA monitor) Computes the number of trees in each 2-inch diameter class for an uneven-aged stand, given a Q factor, maximum and minimum diameters, and residual basal area.  Plots a cross section of tree profiles along the side of one acre.  A lot of fun, if you have a VGA monitor!
  • RMCRUZ4 - Summarizes variable radius BAF cruise data from multiple plots and produces a stand table of density, cubic, and scribner volumes by height and diameter class.  Volume equations are from RM Station publications. The program can produce a stand table combining all species, or with repeated runs, produce a table for each species in the stand.  Output is saved as a user-defined ASCII file for later printing or viewing.  
  • TRAV - Chain and compass traverse summary.  Computes error of  closure and acreage of traversed area from a data file containing azimuth compass bearings, slope distances in feet, and % slope.  Outputs X and Y coordinates in file XYDATA.OUT which can be used to plot the traverse in commercial  graphics or statistical programs.  
  • TREEHTS -  Computes tree heights given negative  % angle to the base, positive % angle to the tip and slope distance to a tree.  Allows clinometer readings to be taken wherever a tree can be seen.

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