1. General Model Information

Name: A Canopy and Shrub extension of the Forest Vegetation Simulator (FVS)

Acronym: COVER

Main medium: terrestrial
Main subject: biogeochemistry
Organization level:
Type of model: not specified
Main application:
Keywords: forest, canopy closure, crown volume, crown profile, foliage biomass


Dr. Gary Dixon
USDA Forest Service
3825 E. Mulberry Street
Fort Collins
CO 80524
Fax : 303-498-1660
email: fswa/s=g.dixon/ ou=w04A@mhs.attmail.com



COVER is a deterministic extension of the Prognosis Forest Vegetation Simulator (FVS) Model. FVS is a widely used Forest Service model used to manage forest stands. It predicts tree canopy closure, crown volume, crown profile and foliage biomass of trees in forest stands. It is primarily developed for use in forests in the Western United States. COVER may be used with another FVS extension model, SHRUBS which models understory components of a forest stand.

The COVER model requires Prognosis to run. The CANOPY and SHRUBS extensions are evoked using the `cover' and `shrubs' options in the FVS model (Moeur, 1985). FVS stand input includes: sample design, species lists with initial diameters, DEM data, time since disturbance, type of disturbance and physiographic position.

The COVER and FVS models provide the user with tables showing the number of trees per acre, canopy closure and crown profiles by 10 foot vertical height classes. Shrub statistics for species is also produced.

The COVER extensions have been developed by Gary Dixon and Melinda Moeur. The COVER module is being used extensively in Moscow, Idaho by the Forest Service.

Author of the abstract:


A Model Data Needs Assessment Report CIESIN

II. Technical Information

II.1 Executables:

Operating System(s): Any PC that has a math coprocessor DOS

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Moeur, Melinda. 1985.
COVER: A User;s Guide to the CANOPY and SHRUBSExtension of the Stand Prognosis Model. General Technical Report INT-190.Ogden, UT: U.S. Department of Agriculture, Forest Service, IntermountainResearch Station. 49p.

V. Further information in the World-Wide-Web

VI. Additional remarks

The Prognosis FVS model "system" , including COVER, may be useful instudying global change impacts in western US forest stands. Modules have alsobeen developed to examine forest pest impacts on forest production as well.

Last review of this document by: T. GabeleNov 21th 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:41 CEST 2002

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