create_travel_surface: Create travel time surfaces
In PATH-Global-Health/catchment: Weighted Spatial Point Catchment Modelling

create_travel_surface

R Documentation

Create travel time surfaces

Description

Create travel time surfaces

Usage

create_travel_surface(
  friction_surface,
  points,
  extent_file = NA,
  id_col = NA,
  x_col = "x",
  y_col = "y",
  clip_flag = FALSE,
  transition_matrix_exists_flag = FALSE,
  individual_surfaces = FALSE,
  output_dir = NA,
  parallel = TRUE,
  cores = floor(parallel::detectCores()/2),
  check_existing = FALSE,
  overwrite = FALSE,
  ...
)

Arguments

`friction_surface`	A raster containing the travel cost per pixel.
`points`	A dataframe containing fields for LABEL, X, and Y for point-level features.
`extent_file`	A raster or shapefile used to define extent of points and friction surface.
`id_col`	A character string corresponding to the column in points dataframe for LABEL field.
`x_col`	A character string corresponding to the column in points dataframe for x coordinate field.
`y_col`	A character string corresponding to the column in points dataframe for y coordinate field.
`clip_flag`	TRUE/FALSE: Should the friction surface extent be clipped?
`transition_matrix_exists_flag`	TRUE/FALSE: Has the already been constructed, must be in output_dir.
`individual_surfaces`	TRUE/FALSE: Should individual travel surface be created for each point?
`output_dir`	A character string for output directory (rasters and intermediate outputs).
`parallel`	TRUE/FALSE: Should individual surfaces be created using parallel processing?
`cores`	an integer defining the number of CPU cores used for parallel processing
`check_existing`	TRUE/FALSE: Should rasters with LABEL in the output_dir be ignored?
`overwrite`	TRUE/FALSE: Should rasters in output_dir be overwritten?
`...`