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en:software:r4m:r4mcubage:start [2026/06/18 14:18] – joaoluisen:software:r4m:r4mcubage:start [2026/06/18 14:26] (current) – joaoluis
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-|  <html><font face="Times New Roman" size="7" align="center"><br>R Functions for Tree Stem Cubature<br></font></html>  | 
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 ===== About R4Mcubage ===== ===== About R4Mcubage =====
 --------------------------------------------- ---------------------------------------------
  
-The **R** package **R4Mcubage** is a set of functions (**S3** language) to treat data from the measurement of the stem/branch sections of trees.  It deals with excurrent and decurrent trees and can compute the tree wood containt in terms of following stem volume: +R4Mcubage (Version 0.5-5) is an R package designed to make easier and faster processing data from “tree rigourous cubature”. Tree rigorous cubature should be understood as the measuration of invividual tree stems and/or branches along their length, taking the stem/branch diameter outside bark and the stem/branch inside bark (optionally) at several fixed positions along the stem/branch length.
-  * total volume; +
-  * merchantable volume for a given set of minimum merchantable stem diameters; +
-  * merchantable volume for a given set of merchantable heights; and +
-  * merchantable volume for a given set of combinantions of log diameter-length.+
  
-For excurrent trees, it also interpolates stem measurements (for individual stems) based on the relationship of  diameter-height along the stem to generate: +The package takes into account two types of crown shapes: excurrent and decurrent. For excurrent trees the basic unit for the measurement of the tree wood content (wood volume) is the stem, because branch wood content is considered negligible. For decurrent trees the branch is the basic unit for the measurement of the tree wood volume and it is assumed that one single stem might have multiples branches.
-  * the stem diameter for a given height along the stem (absolute or relative to tree's total height); and +
-  * the height along the stem for a given diameter (absolute or relative to tree's DBH).+
  
-**R4Mcubage** computes the merchantable volume ratio for: +The packages has functions to perform the following operations: 
-  * excurrent trees as the cumulative volume along the stem as function of diameter-height; and +  * computation of the total volume of stems; 
-  * decurrent trees as the cumulative volume for the whole stem as a function of diameter.+  * interpolation of stem measures such as: 
 +     * diameter at a given height/position of the stem, and 
 +     * height/position at the stem for a given diameter. 
 +  * computation of merchantable volume as: 
 +     * merchantable volume up to a given merchantable diameter of the stem, 
 +     * merchantable volume up to a given merchantable height at the stem, 
 +     * merchantable volume for wood use classes defined as combinations of a minimum log diameter and a log length. 
 +  * computation of ratio of the merchantable volume to the total volume of the stem. 
 +  * computation of form factor (empirical form factor) and form indices for the stem as a whole and for stem sections.
  
-Two functions for plotting make easy to plot: +For decurrent trees data, some of the above computations can not be performed. The package also has some utility and plotting functions to help manage and analyse data from tree cubature.
-  * stem profile (excurrent trees) as absolute values of diameter-height or as taper equation data; +
-  * branch profile (decurrent trees) as abolute values of diameter-height; +
-  * merchantable volume ratio as function of diameter (excurrent/decurrent) or as function of height (excurrent only). +
-A interactive argument of the function for profile plotting allows the visual inspection of individual stems one-by-one for checking problematic data.+
  
  
-\\ + 
-===== R4Mcubage's Objective =====+===== Objective =====
 --------------------------------------------- ---------------------------------------------
  
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 Download, install and use __**at your own risk**__: Download, install and use __**at your own risk**__:
-    * //**Pacote em desenvolvimento**// as a **.tar.gz** file.+    * //**Package under development**// as a **.tar.gz** file.
     * Tutorial PDF.     * Tutorial PDF.
  
 \\ \\
-===== Contact =====+===== Authors and Contact =====
 --------------------------------------------- ---------------------------------------------
 +
  
 E-mail in //insilvaarbores.com.br//. E-mail in //insilvaarbores.com.br//.