dd_martin: Matin & Ek (1984) index

In italocegatta/comp3:

Description

Sum of the ratio between the diameter of the competitor and object tree multiplied by the exponential factor weighted by the distance and diameter of the trees.

Usage

dd_martin(id, x, y, dbh, search = "nearest", n)

Arguments

id	tree identification
x	x numeric vector of tree coordinates.
dbh	diameter of trees at 1.3 meters.
search	method to search competitive trees. Use "nearest" to find the n trees nearest of object tree or "dfixed" to find any tree around of n distance.

References

MARTIN, G.L.; EK, A.R., 1984. A comparison of competition measures and growth models for predicting plantation red pine diameter and height growth. Forest Science 30(3): 731-743.

italocegatta/comp3 documentation built on May 18, 2019, 5:52 a.m.