| Title: | Shoreline Dating Coastal Stone Age Sites |
|---|---|
| Description: | Provides tools for shoreline dating coastal Stone Age sites. The implemented method was developed in Roalkvam (2023) <doi:10.1016/j.quascirev.2022.107880> for the Norwegian Skagerrak coast. Although it can be extended to other areas, this also forms the core area for application of the package. Shoreline dating is based on the present-day elevation of a site, a reconstruction of past relative sea-level change, and empirically derived estimates of the likely elevation of the sites above the contemporaneous sea-level when they were in use. The geographical and temporal coverage of the method thus follows from the availability of local geological reconstructions of shoreline displacement and the degree to which the settlements to be dated have been located on or close to the shoreline when they were in use. Methods for numerical treatment and visualisation of the dates are provided, along with basic tools for visualising and evaluating the location of sites. |
| Authors: | Isak Roalkvam [aut, cre] |
| Maintainer: | Isak Roalkvam <[email protected]> |
| License: | GPL (>= 3) |
| Version: | 1.1.1.9000 |
| Built: | 2024-08-30 04:23:14 UTC |
| Source: | https://github.com/isakro/shoredate |
Function to create isobases for interpolating shoreline displacement curves within the spatial coverage in south-eastern Norway. This is done from the centre points of the supplied displacement curves. Isobases can also be created for multiple directions, which is useful for testing the sensitivity of dates to the direction of the isobases.
create_isobases(isobase_direction)create_isobases(isobase_direction)
isobase_direction |
A numerical vector holding a single or multiple directions for the isobases. |
A simple feature holding the isobases represented as lines.
# Create isobases in a specified direction isobases <- create_isobases(327) plot(sf::st_geometry(isobases)) # Create isobases using different directions isobases <- create_isobases(c(327, 338)) # Plot for visualisation plot(sf::st_geometry(isobases))# Create isobases in a specified direction isobases <- create_isobases(327) plot(sf::st_geometry(isobases)) # Create isobases using different directions isobases <- create_isobases(c(327, 338)) # Plot for visualisation plot(sf::st_geometry(isobases))
Function for plotting shoreline displacement curves. Calling to plot without providing a target curve will display the four underlying geologically derived displacement curves.
displacement_plot( target_curve = NA, displacement_curves = c("Horten", "Porsgrunn", "Tvedestrand", "Arendal"), target_name = "Target curve", target_line = "solid", target_col = "red", target_alpha = 1, displacement_line = c(Horten = "solid", Porsgrunn = "solid", Tvedestrand = "solid", Arendal = "solid"), displacement_col = c(Horten = "darkorange", Porsgrunn = "darkgreen", Tvedestrand = "blue", Arendal = "black"), displacement_alpha = 1, greyscale = FALSE )displacement_plot( target_curve = NA, displacement_curves = c("Horten", "Porsgrunn", "Tvedestrand", "Arendal"), target_name = "Target curve", target_line = "solid", target_col = "red", target_alpha = 1, displacement_line = c(Horten = "solid", Porsgrunn = "solid", Tvedestrand = "solid", Arendal = "solid"), displacement_col = c(Horten = "darkorange", Porsgrunn = "darkgreen", Tvedestrand = "blue", Arendal = "black"), displacement_alpha = 1, greyscale = FALSE )
target_curve |
Data frame holding a shoreline displacement curve. |
displacement_curves |
Character vector specifying which geologically
informed displacement curves should be plotted. Accepted values are
|
target_name |
Character value specifying the name that is given to the
target curve, if provided. Defaults to |
target_line |
Character value specifying the line type that is used for
the target curve, if this is provided. Defaults to |
target_col |
Character value specifying the colour that is used for the
target curve, if this is provided. Defaults to |
target_alpha |
Numerical value specifying the alpha value that is used
for the target curve, if this is provided. Defaults to |
displacement_line |
Character vector specifying the line types that are
used for the geological displacement curves to be plotted. Defaults to
|
displacement_col |
Character vector specifying the colours that are
used for the geological displacement curves to be plotted. Defaults to
|
displacement_alpha |
Numerical value specifying the alpha value that are used for all of the geological displacement curves to be plotted. Defaults to 1. |
greyscale |
Logical value indicating whether the plot should be in
greyscale or not. Defaults to |
A plot displaying the underlying shoreline displacement curves and, if provided, a target curve.
# Empty plot for speed displacement_plot(displacement_curves = "")# Empty plot for speed displacement_plot(displacement_curves = "")
Interpolate the trajectory of past shoreline displacement to a target location within the spatial coverage on the Skagerrak coast of south-eastern Norway. This based on the distance of the location to the shoreline isobases of the geologically derived displacement curves and is done using inverse distance weighting.
interpolate_curve( target, isobases = NA, power = 2, cal_reso = 10, verbose = FALSE )interpolate_curve( target, isobases = NA, power = 2, cal_reso = 10, verbose = FALSE )
target |
A spatial target location to where the new displacement curve is interpolated. |
isobases |
4 spatial lines representing the shoreline isobases of the
existing displacement curves. Multiple sets of 4 isobases with different
isobase directions can be provided (see |
power |
A numerical value indicating the inverse distance power for IDW.
Defaults to |
cal_reso |
A numerical value specifying the resolution to use on the
calendar scale. Defaults to |
verbose |
Logical value indicating whether progress should be printed to
console. Defaults to |
Returns a list holding an interpolated displacement curve for each
isobase direction. Each displacement curve is represented by a data frame
with the columns bce where negative values indicate years BCE and positive
CE, lowerelev, representing the lower limit for the elevation of the
shoreline for each year. upperelev, the upper limit for elevation of the
shoreline for each year, and direction which indicates the direction of
the isobases used when interpolating the curve.
# Create example point using the required coordinate system # WGS84 / zone UTM32N (EPSG: 32632) target_point <- sf::st_sfc(sf::st_point(c(579570, 6582982)), crs = 32632) # Interpolate shoreline displacement curve to the target point location, # setting the resolution on the calendar scale to 2000 years for speed. target_curve <- interpolate_curve(target_point, cal_reso = 2000)# Create example point using the required coordinate system # WGS84 / zone UTM32N (EPSG: 32632) target_point <- sf::st_sfc(sf::st_point(c(579570, 6582982)), crs = 32632) # Interpolate shoreline displacement curve to the target point location, # setting the resolution on the calendar scale to 2000 years for speed. target_curve <- interpolate_curve(target_point, cal_reso = 2000)
Print the dates held in a shoreline_date object. Each date is printed
with site name, elevation and highest density region. If the isobase
direction is different or more are provided than the default, the
directions and dates associated with these are printed separately.
## S3 method for class 'shoreline_date' print(x, ...)## S3 method for class 'shoreline_date' print(x, ...)
x |
Object of class |
... |
Additional arguments. |
Print the site names, elevations, non-default isobase directions and
HDRs contained in a shoreline_date object to console.
target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(site = target_point, elevation = 70, elev_reso = 1, cal_reso = 400) # Print to console target_datetarget_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(site = target_point, elevation = 70, elev_reso = 1, cal_reso = 400) # Print to console target_date
Function to find 95% highest density region (HDR) for a provided shoreline date. Negative values denote years BCE while positive values denote CE.
shoredate_hdr(bce, probability, site_name, cal_reso, prob = 0.95)shoredate_hdr(bce, probability, site_name, cal_reso, prob = 0.95)
bce |
A vector holding calendar years associated with a date. |
probability |
A vector holding the probability mass corresponding to each calendar year. |
site_name |
A vector holding the name of the site that has been dated. |
cal_reso |
Resolution on the calendar scale used when dating the site. |
prob |
A numerical value between 0 and 1 indicating the probability
coverage of the HDR. Defaults to |
A list holding start and end points for segments of the highest density region of a shoreline date, the weighted mean date, the probability coverage and site name.
target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(sites = target_point, elevation = 80, elev_reso = 1, cal_reso = 400) # shoredate_hdr() is already called under the hood with shoreline_date(), # the result of which is printed when calling the shoreline_date object target_date # However, shoredate_hdr() can be applied separately by pulling the # necessary data from the date (shoredate_hdr(target_date[[1]][[1]]$date$bce, target_date[[1]][[1]]$date$probability, target_date[[1]][[1]]$site_name, target_date[[1]][[1]]$cal_reso))target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(sites = target_point, elevation = 80, elev_reso = 1, cal_reso = 400) # shoredate_hdr() is already called under the hood with shoreline_date(), # the result of which is printed when calling the shoreline_date object target_date # However, shoredate_hdr() can be applied separately by pulling the # necessary data from the date (shoredate_hdr(target_date[[1]][[1]]$date$bce, target_date[[1]][[1]]$date$probability, target_date[[1]][[1]]$site_name, target_date[[1]][[1]]$cal_reso))
Function for plotting shoreline dates along with associated metadata.
shoredate_plot( shorelinedates, date_probability = TRUE, date_probability_scale = 10000, elevation_distribution = TRUE, displacement_curve = TRUE, site_name = FALSE, parameters = FALSE, isobase_direction = FALSE, highest_density_region = TRUE, hdr_label = TRUE, multiplot = FALSE, date_col = NA, date_fill = "darkgrey", displacement_col = "red", displacement_fill = "red", site_elevation_col = "#046c9a", site_elevation_fill = "#046c9a", hdr_col = "black", hdr_label_xadj = 0.2, hdr_label_yadj = 0.3, greyscale = FALSE )shoredate_plot( shorelinedates, date_probability = TRUE, date_probability_scale = 10000, elevation_distribution = TRUE, displacement_curve = TRUE, site_name = FALSE, parameters = FALSE, isobase_direction = FALSE, highest_density_region = TRUE, hdr_label = TRUE, multiplot = FALSE, date_col = NA, date_fill = "darkgrey", displacement_col = "red", displacement_fill = "red", site_elevation_col = "#046c9a", site_elevation_fill = "#046c9a", hdr_col = "black", hdr_label_xadj = 0.2, hdr_label_yadj = 0.3, greyscale = FALSE )
shorelinedates |
Object of class |
date_probability |
Logical value indicating whether the
probability distribution of the shoreline date should be plotted.
Defaults to |
date_probability_scale |
Numerical constant with which to scale the probability distribution of the date to make it fit the plot. Defaults to 10000. |
elevation_distribution |
Logical value indicating whether the
distribution describing the distance between site and shoreline should be
displayed. Default is |
displacement_curve |
Logical value indicating whether the displacement
curve should be displayed. Default is |
site_name |
Logical value indicating whether the name of the site should
be printed in the header of the plot. Defaults to |
parameters |
Logical value indicating whether the parameters of the
statistical function should be displayed. Default is |
isobase_direction |
Logical value indicating whether the direction of
the isobases should be printed. Default is |
highest_density_region |
Logical value indicating whether the 95%
highest density region should be displayed. Defaults to |
hdr_label |
Logical value indicating whether the numeric values for the
highest density regions should be displayed. Default is |
multiplot |
Logical value indicating whether multiple dates should be
plotted individually, or be collapsed into a single plot. The only other
graphical option with |
date_col |
Character value specifying the outline colour of the
probability distribution of the shoreline date. Defaults to |
date_fill |
Character value specifying the fill colour of the
probability distribution of the shoreline date. Defaults to |
displacement_col |
Character value specifying the outline colour of the
displacement curve. Defaults to |
displacement_fill |
Character value specifying the fill colour of the
displacement curve. Defaults to |
site_elevation_col |
Character value specifying the outline colour of
the distribution describing the likely distance between site and shoreline.
Defaults to |
site_elevation_fill |
Character value specifying the fill colour of
the distribution describing the likely distance between site and shoreline.
Defaults to |
hdr_col |
Character value specifying the colour of the line
segment giving the highest density region of the shoreline date. Defaults to
|
hdr_label_xadj |
Numerical value between 0 and 1 specifying the position
of the HDR label on the x-axis. Increasing the value moves the label further
from the plot border. Defaults to |
hdr_label_yadj |
Numerical value between 0 and 1 specifying the position
of the HDR label on the y-axis. Increasing the value moves the label further
from the plot border. Defaults to |
greyscale |
Logical value indicating whether the plot should be in
greyscale or not. If |
shoredate_plot() returns a plot displaying the provided shoreline
dates. A single plot is created for each date, where a range of settings can
be adjusted to display or hide various parameters and results. Setting the
parameter multiplot to TRUE returns a sparser version for multiple
dates, where the only option is whether or not to display the highest
density region in addition to each date. multiplot does not allow for
multiple isobase directions. Negative values denote years BCE while positive
values denote CE.
Plot(s) displaying shoreline dates and associated metadata.
# Create example point with correct coordinate reference system target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(sites = target_point, elevation = 80, elev_reso = 10, cal_reso = 500) shoredate_plot(target_date)# Create example point with correct coordinate reference system target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_date <- shoreline_date(sites = target_point, elevation = 80, elev_reso = 10, cal_reso = 500) shoredate_plot(target_date)
Function to plot the sum of the probabilities of multiple shoreline dates as
resulting from running sum_shoredates().
shoredate_sumplot(shoredates_sum, sample_size = TRUE)shoredate_sumplot(shoredates_sum, sample_size = TRUE)
shoredates_sum |
Object of class |
sample_size |
Logical indicating whether or not to display the number of
summed dates on the plot. Defaults to |
A line plot showing the provided summed probability distribution.
# Create example points target_points <- sf::st_sfc(sf::st_point(c(538310, 6544255)), sf::st_point(c(538300, 6544250))) # Set correct CRS target_points <- sf::st_as_sf(target_points, crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_dates <- shoreline_date(target_points, elevation = c(65, 70), elev_reso = 10, cal_reso = 750) # Find summed probability target_sum <- sum_shoredates(target_dates) # Call to plot shoredate_sumplot(target_sum)# Create example points target_points <- sf::st_sfc(sf::st_point(c(538310, 6544255)), sf::st_point(c(538300, 6544250))) # Set correct CRS target_points <- sf::st_as_sf(target_points, crs = 32632) # Reduce date resolution with cal_reso and elevation_reso for speed target_dates <- shoreline_date(target_points, elevation = c(65, 70), elev_reso = 10, cal_reso = 750) # Find summed probability target_sum <- sum_shoredates(target_dates) # Call to plot shoredate_sumplot(target_sum)
A function for shoreline dating Stone Age sites based on their present-day elevation, their likely elevation above sea-level when in use and the trajectory of past shoreline displacement. Details and caveats pertaining to the implemented method is given in Roalkvam (2023).
shoreline_date( sites, elevation = NA, elev_reso = 0.01, cal_reso = 10, isobase_direction = 327, sum_isobase_directions = FALSE, model = "gamma", model_parameters = c(0.286, 20.833), elev_fun = "mean", upper_temp_limit = -2500, target_curve = NA, hdr_prob = 0.95, normalise = TRUE, sparse = FALSE, verbose = FALSE )shoreline_date( sites, elevation = NA, elev_reso = 0.01, cal_reso = 10, isobase_direction = 327, sum_isobase_directions = FALSE, model = "gamma", model_parameters = c(0.286, 20.833), elev_fun = "mean", upper_temp_limit = -2500, target_curve = NA, hdr_prob = 0.95, normalise = TRUE, sparse = FALSE, verbose = FALSE )
sites |
Vector giving one or more site names, or, if displacement curves
are to be interpolated, objects of class |
elevation |
Vector of numeric elevation values for each site or a
an elevation raster of class |
elev_reso |
Numeric value specifying the resolution with which to step through the distribution representing the distance between site and shoreline. Defaults to 0.01m. |
cal_reso |
Numeric value specifying the resolution to use on the calendar scale. Defaults to 10. |
isobase_direction |
A vector of numeric values defining the direction(s) of the isobases. Defaults to 327. |
sum_isobase_directions |
Logical value indicating that if multiple
isobase directions are specified in |
model |
Character vector specifying the statistical model with which to model the distance from site to shoreline. Currently accepts either "none" or "gamma". Defaults to "gamma". |
model_parameters |
Vector of numeric values specifying the parameters for the statistical model describing the distance between site and shoreline. Defaults to c(0.286, 20.833), denoting the shape and scale of the default gamma function, respectively. |
elev_fun |
Statistic to define site elevation if this is to be derived
from an elevation raster. Uses |
upper_temp_limit |
Numerical value giving the upper temporal limit. Dates with a start date after the limit are returned as NA. Defaults to -2500, i.e. 2500 BCE. |
target_curve |
Data frame holding pre-computed shoreline displacement
curve. This has to have the same or higher resolution on the calendar scale
as that specified with |
hdr_prob |
Numeric value specifying the coverage of the highest density region. Defaults to 0.95. |
normalise |
Logical value specifying whether the shoreline date should be normalised to sum to unity. Defaults to TRUE. |
sparse |
Logical value specifying if only site name and shoreline date
should be returned. Defaults to FALSE. Note that of the functions for
further treatment, sparse dates are only compatible with
|
verbose |
Logical value indicating whether progress should be printed to console. Defaults to FALSE. |
A nested list of class shoreline_date holding the shoreline date
results and associated metadata for each dated site for each isobase
direction. The elements of each date is:
site_name name of the site.
site_elev elevation of the site.
date data frame with the columns bce where negative values
indicate years BCE and positive CE, as well as probability, which gives
the probability mass for each year.
weighted_mean the weighted mean date.
hdr_start start values for the HDR ranges.
hdr_end end values for the HDR ranges.
hdr_prob probability level for the HDR.
dispcurve data frame holding the displacement curve used for dating
the site. This has the columns bce, giving years BCE/CE. lowerelev,
the lower limit for the elevation of the shoreline for each year.
upperelev, the upper limit for elevation of the shoreline for each year.
dispcurve_direction direction of the isobases in use.
model_parameters parameters for the statistical model.
modeldat data frame holding the model distribution. The column
offset denotes the vertical distance (m) from the shoreline, as specified
by the elev_reso argument. px is the cumulative probability at each step
of offset, and probs is the probability of each step found by
subtracting the preceding value from each value of px.
cal_reso resolution on the calendar scale.
Roalkvam, I. 2023. A simulation-based assessment of the relation between Stone Age sites and relative sea-level change along the Norwegian Skagerrak coast. Quaternary Science Reviews 299:107880. DOI: https://doi.org/10.1016/j.quascirev.2022.107880
# Create example point using the required CRS WGS84 UTM32N (EPSG: 32632) target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Date target point, manually specifying the elevation instead of providing # an elevation raster. Reducing elev_reso and cal_reso for speed. shoreline_date(sites = target_point, elevation = 80, elev_reso = 1, cal_reso = 400)# Create example point using the required CRS WGS84 UTM32N (EPSG: 32632) target_point <- sf::st_sfc(sf::st_point(c(538310, 6544255)), crs = 32632) # Date target point, manually specifying the elevation instead of providing # an elevation raster. Reducing elev_reso and cal_reso for speed. shoreline_date(sites = target_point, elevation = 80, elev_reso = 1, cal_reso = 400)
Function for finding the summed probability distribution of multiple shoreline dates.
sum_shoredates( shoreline_dates, cut_off = -2500, cut_off_level = 1, normalise = TRUE )sum_shoredates( shoreline_dates, cut_off = -2500, cut_off_level = 1, normalise = TRUE )
shoreline_dates |
Object of class |
cut_off |
Calendar year specifying where dates should be cut off. Defaults to 2500 BCE. |
cut_off_level |
Numerical value between 0 and 1 indicating the probability mass that has to fall after the cut-off for a date to be excluded. Defaults to 1, retaining all dates. |
normalise |
Logical value indicating whether the probability sum of the dates should be normalised to sum to unity. Defaults to TRUE. |
List of class shoredate_sum holding the elements:
sum data frame with the columns bce where negative values
indicate years BCE and positive CE, as well as probability, which gives
the probability mass for each year.
dates_n number of dates that make up the sum after applying any
specified cut-off. One date per site per isobase direction.
target_points <- sf::st_sfc(sf::st_point(c(538310, 6544255)), sf::st_point(c(538300, 6544250))) target_points <- sf::st_as_sf(target_points, crs = 32632) # Shoreline date, reducing resoltuion on elevation and calendar scales for # speed. target_dates <- shoreline_date(target_points, elevation = c(65, 70), elev_reso = 10, cal_reso = 500) sum_shoredates(target_dates)target_points <- sf::st_sfc(sf::st_point(c(538310, 6544255)), sf::st_point(c(538300, 6544250))) target_points <- sf::st_as_sf(target_points, crs = 32632) # Shoreline date, reducing resoltuion on elevation and calendar scales for # speed. target_dates <- shoreline_date(target_points, elevation = c(65, 70), elev_reso = 10, cal_reso = 500) sum_shoredates(target_dates)
Function to plot the centroids of sites to be dated and shoreline isobases of employed displacement curves on a basemap. Defaults to displaying a light-weight version of the spatial coverage in south-eastern Norway. However, spatial geometries covering other regions can also be provided or temporarily downloaded with the function.
target_plot( targets = NA, isobases = sf::st_read(system.file("extdata/isobases.gpkg", package = "shoredate", mustWork = TRUE), quiet = TRUE), basemap = sf::st_read(system.file("extdata/naturalearth_basemap.gpkg", package = "shoredate", mustWork = TRUE), quiet = TRUE), crs_epsg = 32632, naturalearth_basemap = FALSE, naturalearth_zoom = c(20000, 20000), target_labels = TRUE, scalebar = TRUE, scalebar_width = 0.4, scalebar_style = "ticks", scalebar_location = "br", base_fill = "grey", base_col = NA, target_shape = 21, target_col = "black", target_fill = "red", target_size = 2.25, isobase_line = c(Horten = "solid", Porsgrunn = "solid", Tvedestrand = "solid", Arendal = "solid"), isobase_col = c(Arendal = "black", Porsgrunn = "darkgreen", Tvedestrand = "blue", Horten = "darkorange"), greyscale = FALSE )target_plot( targets = NA, isobases = sf::st_read(system.file("extdata/isobases.gpkg", package = "shoredate", mustWork = TRUE), quiet = TRUE), basemap = sf::st_read(system.file("extdata/naturalearth_basemap.gpkg", package = "shoredate", mustWork = TRUE), quiet = TRUE), crs_epsg = 32632, naturalearth_basemap = FALSE, naturalearth_zoom = c(20000, 20000), target_labels = TRUE, scalebar = TRUE, scalebar_width = 0.4, scalebar_style = "ticks", scalebar_location = "br", base_fill = "grey", base_col = NA, target_shape = 21, target_col = "black", target_fill = "red", target_size = 2.25, isobase_line = c(Horten = "solid", Porsgrunn = "solid", Tvedestrand = "solid", Arendal = "solid"), isobase_col = c(Arendal = "black", Porsgrunn = "darkgreen", Tvedestrand = "blue", Horten = "darkorange"), greyscale = FALSE )
targets |
Objects of class |
isobases |
Spatial lines as object of class |
basemap |
Object of class |
crs_epsg |
Numeric value specifying the EPSG code of the coordinate reference system (CRS) to be used. Geometries with a different CRS will be re-projected. Defaults to 32632, which is WGS 84 / UTM zone 32N (EPSG:32632). |
naturalearth_basemap |
Logical value specifying if a background map
should be downloaded to be used as a basemap. Downloaded files are stored
with |
naturalearth_zoom |
A vector of two numerical values specifying the
amount of cropping that is done around provided |
target_labels |
Logical value specifying whether the targets should be
labelled in the plot. Takes the first column beyond the one holding the
geometries to represent names. If this is not present the targets are
labelled by row number. Defaults to |
scalebar |
Logical specifying whether a scale bar should be added to the
plot. Defaults to |
scalebar_width |
Numerical value specifying the width of the scale bar
by passing it to the |
scalebar_style |
Character value specifying the style of the scale bar
by passing it to the |
scalebar_location |
Character value specifying the location of the
scale bar on the plot by passing it to the |
base_fill |
Character value specifying the fill colour of the basemap.
Defaults to |
base_col |
Character value specifying the outline colour of the
basemap. Defaults to |
target_shape |
Numerical value specifying the point shape that represent
the centroids of the targets. Defaults to |
target_col |
Character value specifying the colour parameter for the
points that represent the centroids of the targets. Defaults to |
target_fill |
Character value specifying the fill parameter for the
points that represent the centroids of the targets. Defaults to |
target_size |
Numerical value specifying the size of the points that
represent the centroids of the targets. Defaults to |
isobase_line |
Vector of character values specifying the linetype that
is used to represent the isobases of the geologically derived displacement
curves. Defaults to |
isobase_col |
Vector of character values specifying the colours used
for the lines that represent the isobases of the geologically derived
displacement curves. Defaults to |
greyscale |
Logical value indicating whether the plot should include
colours or not. Overrides other graphical parameters When set to |
A ggplot that displays a background map with the location of the shoreline isobases within the spatial coverage in south-eastern Norway, unless geometries for other regions are provided. If provided, the function also plots the position of target locations represented as centroids.
# Display the background map and default isobases target_plot()# Display the background map and default isobases target_plot()