View source: R/ring_calculate.R
ring_calculate | R Documentation |
This function can calculate ring widths according to coordinates of detected ring borders.
ring_calculate(ring.data, seriesID)
ring.data |
A matrix or array produced by |
seriesID |
A character string specifying the column name of the ring-width series. |
A data frame. The series ID is the column name and years are row names. The measurements units are millimeters (mm).
Jingning Shi
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')
## Calculate ring widths from the attribute list of t2:
rw.df <- ring_calculate(ring.data = t2, seriesID = "940220")
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