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The Stand Summary Statistics Event Monitor Addfile
What is the Summary Statistics EM Addfile?

The Summary Statistics EM Addfile (Sum_stats.kcp) is an FVS keyword component file that returns basic FVS variables to user-defined COMPUTE variable names. This addfile does not perform any stand management activities. It was designed so that the FVS variables—after being written to a .cp2 file (via the Compute2 post-processor available in Suppose)—may be spatially displayed in map form via the FVS-EMAP, a custom ArcView® project that joins .cp2 file output variables to a shapefile.

 

How do I download the Summary Statistics Addfile?

Select the following links to download the FVS Summary Statistic User's Guide, or select the Entire Package link for the FVS Summary Statistic EM Addfile and documentation.

Downloading Individual Files:

Downloading the Entire Package:

  1. The FVS Stand Summary Statistic Package link will download a self-extracting Zip file. You may download this .exe file anywhere on your computer.
  2. Once downloaded, double-click the .exe file to begin the extraction process.
  3. Although you may extract the files to anywhere on your computer, we recommend that you use the default extraction locations.
  4. A number of files will be extracted into c:/fvs_emap. (If you do not have this directory, the extraction process will create it.) The files will include the FVS-EMAP ArcView® Project itself (EMAP.apr), the Stand Summary Statistics EM Addfile (sum_stats.kcp, and the accompanying User's Guides.
  5. The extraction will also create 2 subdirectories under the fvs_emap directory, named 'Legends' and SupportFiles'.
    The Legends directory wil contain a number of pre-formed ArcView® legend files (*.avl files) to be used with the FVS-EMAP, for output variables generated by the Stand Summary EM Addfile.
    Although the SupportFiles directory will be empty upon download, do not delete it. It is required byt the FVS-EMAP project.

 

What variables are reported?

This EM addfile writes the following FVS variables to COMPUTE variable output tables:

  • Cycle end year
  • Stand age

    The following reported both before and after any simulated management actions:
    • Total trees per acre (TPA)
    • Total stand basal area (BA)
    • Stand density index (SDI)
    • Crown competition factor (CCF)
    • Average top height
    • Quadratic mean diameter for the stand (QMD)
    • Total cubic feet in the stand
    • Total merchantable cubic feet in the stand
    • Total merchantable board feet in the stand
  • TPA removed
  • BA removed
  • Cubic feet removed
  • Merchantable cubic feet removed
  • Merchantable board feet removed
  • FVS cycle length
  • Growth accretion (cu ft/acre/year)
  • Mortality volume (cu ft/acre/year)
  • Mean annual increment (volume) from previous cycle (cu ft/acre/year)
  • Stand sampling weight (usually acres)

 

Event Monitor Output

Output from this Event Monitor addfile will include the values of all variables listed above (as well as the Stand ID and the cycle start year, which are always listed in COMPUTE variable output), for every projected growth cycle (except for those variables that are undefined in the first cycle). Output is written to the standard FVS output table.

Output may also be written to a .cp2 file via the Compute2 post-processor available in Suppose. The .cp2 file subsequently may be loaded into a custom ArcView® project (FVS-EMAP) that can read-in .cp2 file output variables and link them to a shapefile, thereby producing a spatial presentation of the FVS output.

 

References

Crookston, Nicholas L. 1990. User's guide to the Event Monitor: Part of Prognosis Model Version 6.

USDA Forest Service Gen. Tech. Rep. INT-275. Intermountain Res.Sta., Ogden, UT 29pp. [Electronic Version (modified Sept. 2001) available online:
http://www.fs.fed.us/fmsc/fvs/documents/gtrs_event_monitor.php

 

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