ch_wbt_catchment {CSHShydRology}

Delineate catchment boundaries

Description

Delineate catchment boundaries

Usage

ch_wbt_catchment(
  fn_pp_snap,
  fn_flowdir,
  fn_catchment_ras,
  fn_catchment_vec,
  return_vector = TRUE
)

Arguments

fn_pp_snap

Name of file containing snapped pour points

fn_flowdir

Name of file containing flow accumulations.

fn_catchment_ras

Raster file to contain delineated catchment.

fn_catchment_vec

Vector file to contain delineated catchment.

return_vector

If TRUE (the default) a vector of the catchment will be returned.

Value

If return_vector == TRUE a vector of the catchment is returned. Otherwise nothing is returned.

Author(s)

Dan Moore and Kevin Shook

See Also

ch_wbt_catchment_onestep

Examples

# Only proceed if Whitebox executable is installed
library(whitebox)
if (check_whitebox_binary()){
  library(raster)
  test_raster <- ch_volcano_raster()
  dem_raster_file <- tempfile(fileext = ".tif")
  no_sink_raster_file <- tempfile("no_sinks", fileext = ".tif")

  # write test raster to file
  writeRaster(test_raster, dem_raster_file, format = "GTiff")

  # remove sinks
  removed_sinks <- ch_wbt_removesinks(dem_raster_file, no_sink_raster_file, method = "fill")

  # get flow accumulations
  flow_acc_file <- tempfile("flow_acc", fileext = ".tif")
  flow_acc <- ch_wbt_flow_accumulation(no_sink_raster_file, flow_acc_file)

  # get pour points
  pourpoint_file <- tempfile("volcano_pourpoints", fileext = ".shp")
  pourpoints <- ch_volcano_pourpoints(pourpoint_file)
  snapped_pourpoint_file <- tempfile("snapped_pourpoints", fileext = ".shp")
  snapped_pourpoints <- ch_wbt_pourpoints(pourpoints, flow_acc_file, pourpoint_file,
  snapped_pourpoint_file, snap_dist = 10)

  # get flow directions
  flow_dir_file <- tempfile("flow_dir", fileext = ".tif")
  flow_dir <- ch_wbt_flow_direction(no_sink_raster_file, flow_dir_file)
  fn_catchment_ras <- tempfile("catchment", fileext = ".tif")
  fn_catchment_vec <- tempfile("catchment", fileext = ".shp")
  catchments <- ch_wbt_catchment(snapped_pourpoint_file, flow_dir_file, 
  fn_catchment_ras, fn_catchment_vec)
} else {
  message("Examples not run as Whitebox executable not found")
}