standview: R Package for Density Management Diagrams

In mwritchie/standview: R Package for Density Management Diagrams

R Package for Density Management Diagrams

Description

The standview package provides functions to create forest density management diagrams (DMD): dmd.view, gdmd.view, dmd.volume, and dmd.iso. All DMD are rendered in English units. Quadratic mean diameter is in inches, basal area is square feet per acre, height is in feet, and volume is cubic feet per acre. Functions for creating DMDs in Reineke-space (Reineke 1933) with dmd.view and Gingrich-space (Gingrich 1967) with gdmd.view are provided. The user may select from published equations (e.g. Long and Shaw 2005). In the current implimentation there are nine published equations and one generic option.

Details

Note that the default arguments of the functions in the standview package are set for English units. If use.metric (logical) is set to true, these default settings will no longer serve. The user must specifically set values for any arguments which have units associated. So, for example if use.metric=TRUE, then the user must change values accordingly.

The package also includes a sample dataframe: gama05, which contains English-unit observations on 20 research plots at the Goosenest Adaptive Management Area from 2005 (Ritchie 2005).

If you happen to find a problem with the package, please email the author with the script causing the problem, as well as the version number. The version number is shown below or it can be obtained with function call:

packageDescription("standview")$Version

Typical function usages are:

dmd.view(ineq, ...)

gdmd.view(ineq, ...)

dmd.iso(ineq, ...)

dmd.volume(ineq, ...)

Author(s)

Martin W. Ritchie, Research Forester, US Forest Service, Pacific Southwest Research Station. Email: [e-mail]

References

Gingrich, S. (1967) Measuring and evaluating stocking and stand density in upland hardwood forests in the central states. For. Sci. 13(1):38-53.

Long, J.N. and J.D. Shaw (2005) A density management diagram for even-aged ponderosa pine stands. West. J. Appl. For. 20(4):205-215.

Reineke, L.H. (1933) Perfecting a stand density index for even-aged forests. J. Ag. Res. 46:627-638.

Ritchie, M.W. (2005) Ecological research at the Goosenest Adaptive Management Area in northeastern California. Gen. Tech. Rep. PSW-192. USDA For. Serv. Pac. SW Res. Stn. 120p.

See Also

dmd.view gdmd.view dmd.iso dmd.volume dmd.htfunc

mwritchie/standview documentation built on March 29, 2024, 2:32 a.m.