StratigrapheR (version 1.3.1)

weldprofile: Changes profiles in basic lithologs

Description

Adds profiles (hardness, weathering, grain-size, facies, etc.) to lithologs from "litholog()"-like data frames

Usage

weldprofile(log, gap, dt, xy, i = NA, ext = Inf, tolerance = 8, correct = T)

Value

A litholog object, i.e., a table of bed id (i), depth (dt) and xy values (the x position if your litholog is vertical).

Arguments

log

a "litholog()"-like data frame on which the new profile needs to be welded.

gap

The xy value delimiting the litholog in the parts that will remain, and the parts that will be replaced by the profile. This should be comparable to the most inward values of the profile. What side of the litholog will remain depends on the ext parameter.

dt, xy

the depth and intensity values for the profile

i

the beds ids for the points of the profile (is optional; this is useful for complex profiles, which can go back and forth in depth).

ext

the most outward values of the profile; defaults to infinity Inf, for "left-side" profiles, set to -Inf.

tolerance

the order of tolerance for errors, i.e. the number of decimals considered as being meaningful for matching dt to log

correct

this parameter applies in a very specific case, when i is provided, and when the order of points is not straightforward (going from low to high values, or vice versa). If correct is TRUE, the ambiguous parts (in ambiguous beds) of the profile will be reversed.

Examples

# Make an initial log ----

r <- c(1,2,3,4,5)  # left boundary of the bed interval (upper or lower)
l <- c(0,1,2,3,4)  # right boundary of the bed interval (upper or lower)
h <- c(4,3,5,3,4) # hardness (arbitrary)
i <- c("B1","B2","B3","B4","B5") # Bed name

log <- litholog(l,r,h,i) # Generate data frame of the polygons
# making the litholog

# Define the profile ----

# Depths (dt), intensity (xy), and ids (id) of profile points
dt <- c(0,1,1,1,2,2,2,3,3,3,4,4,5)
xy <- c(5,4,3,4,3,3,6,5,3,4,3,5,4)
id <- c("B1","B1","B1","B2","B2","B3","B3","B3","B3","B4","B4","B5","B5")

# Weld profile to litholog ----

nlog <- weldprofile(log = log, gap = 3, dt = dt, xy = xy, i = id, ext = Inf)

# Visualisation ----

opar <- par()$mfrow
par(mfrow = c(1,3))

plot.new()
plot.window(xlim = c(0,6), ylim = c(0,5))

axis(1)
axis(2)

multigons(log$i, log$xy, log$dt)

plot.new()
plot.window(xlim = c(0,6), ylim = c(0,5))

axis(1)
axis(2)

lines(xy, dt, type = "o", pch = 19)

plot.new()
plot.window(xlim = c(0,6), ylim = c(0,5))

axis(1)
axis(2)

multigons(nlog$i, nlog$xy, nlog$dt)

par(mfrow = opar)