Skip to contents

Generate a ring-width series

Source: R/ring_calculate.R
ring_calculate.Rd

This function can calculate ring widths according to coordinates of detected ring borders.

Usage

ring_calculate(ring.data, seriesID)

Arguments

ring.data

A matrix or array produced by ring_detect or ring_modify.

seriesID

A character string specifying the column name of the ring-width series.

Value

A data frame. The series ID is the column name and years are row names. The measurements units are millimeters (mm).

Author

Jingning Shi

Examples

img.path <- system.file("001.png", package = "MtreeRing")

## Read a tree ring image:
t1 <- ring_read(img = img.path, dpi = 1200)

## Split a long core sample into 3 pieces to
## get better display performance and use the
## watershed algorithm to detect ring borders:
t2 <- ring_detect(ring.data = t1, seg = 3, method = 'watershed')
#> Warning: The sampling year is set to the current year

## Calculate ring widths from the attribute list of t2:
rw.df <- ring_calculate(ring.data = t2, seriesID = "940220")