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Extract shoreline from a bathymetric raster using a contour threshold

Source: R/generate_shoreline_from_bathy.R
generate_shoreline_from_bathy.Rd

This function identifies land areas from a bathymetric raster by applying a contour threshold, converts the result into polygon geometry, and optionally saves it to a shapefile. If contour is greater than the max value in bathy a warning is displayed and contour is set to the max value from bathy

Usage

generate_shoreline_from_bathy(
  bathy,
  contour,
  save_output = FALSE,
  filename = "shoreline.shp"
)

Arguments

bathy

A SpatRaster object representing bathymetric or elevation data.

contour

A numeric value representing the elevation threshold to define land.

save_output

Logical. If TRUE, the output polygon will be saved to a shapefile. Default is FALSE.

filename

A string giving the name of the shapefile to save if save_output = TRUE. Default is "shoreline.shp".

Value

A sf polygon object representing the extracted land areas (shoreline).

Examples

if (FALSE) { # \dontrun{
# Example with a bathymetric raster
shoreline <- shoreline_from_bathy(bathy = bathy_raster, contour = 0)

# Save the result to a shapefile
shoreline <- shoreline_from_bathy(
  bathy_raster,
  contour = 0,
  save_output = TRUE,
  filename = "shoreline.shp"
 )
} # }