shelltrace (version 3.5.1)

Oyster_Convert_cross_section: Function that converts XY-data of digitized cross section

Description

Takes XY data of digitized growth increments in a shell cross section and converts them to a common X-axis with the correct lengths in millimeters. de Winter, N. J. (2017) <doi:10.5194/gmd-2017-137>

Usage

Oyster_Convert_cross_section(raw_data, image_length, Xstep = 0.1)

Arguments

raw_data

Numeric data frame containing the X- and Y-coordinates digitized in Adobe Illustrator or another image processing software

image_length

Measured maximum length of the area of the cross section that is represented in "raw_data"

Xstep

The step size (dx) in X-direction used to interpolate coordinates of shell increments

Value

List of two data sets and one value:

cross_section

Digitized cross section of the shell with shell top, bottom and growth increments relative to a common X-axis

year_trace

Digitized cross section of shell increments without addition of top and bottom of the shell to the increment Y-values

lengthfactor

Factor of actual shell length relative to shell length in cross section

incr_matrix

Matrix containing ages and calibrated ages for each shell increment

Details

First step in growth modelling: Converting XY data of increments to a common X-axis

References

de Winter, N. J.: ShellTrace v1.0 - A new approach for modelling growth and trace element uptake in marine bivalve shells: Model verification on pacific oyster shells (Crassostrea gigas), Geosci. Model Dev. Discuss., https:\doi.org\10.5194\gmd-2017-137, in review, 2017.

Examples

# NOT RUN {
  Llist<-Oyster_Convert_cross_section(O1_input, image_length, Xstep=1)
# }