elev_to_hidrology: Calculate derivatives from the Hidrology module

In loreabad6/terrain: Utility Functions for Terrain Derivatives Calculations

Calculate derivatives from the Hidrology module

Description

Calculate derivatives from the Hidrology module

Usage

elev_to_hidrology(
  elev_sgrd = NULL,
  slope_sgrd = NULL,
  spcar_sgrd = NULL,
  out_dir,
  prefix = "",
  envir,
  ...,
  mridx = FALSE,
  sagaw = FALSE,
  sllgt = FALSE,
  spidx = FALSE
)

Arguments

elev_sgrd	optional input, elevation raster data in SAGA format, can be created with elev_to_sgrd()
slope_sgrd	optional input, slope raster data in SAGA format, can be created with elev_to_morphometry(slope = TRUE)
spcar_sgrd	optional input, specific catchment area raster data in SAGA format, can be created with elev_to_terrain_analysis(flow = TRUE, spcar = TRUE) Both options are needed since this is computed from the Flow Accumulation (One Step) module
out_dir	output directory
prefix	character prefix for output filenames
envir	environment to get SAGA installation, can be set with init_saga()
...	ignored, check help page for possible outputs
mridx	Melton Ruggedness Index: Simple flow accumulation related index, calculated as difference between maximum and minimum elevation in catchment area divided by square root of catchment area size. The calculation is performed for each grid cell, therefore minimum elevation is same as elevation at cell’s position. Due to the discrete character of a single maximum elevation, flow calculation is simply done with Deterministic 8. Boolean,defaults to FALSE
sagaw	SAGA Wetness Index: Similar to the ‘Topographic Wetness Index’ (TWI), see eval_to_terrain_analysis but based on a modified catchment area calculation (‘Modified Catchment Area’), which does not think of the flow as very thin film. It predicts for cells situated in valley floors with a small vertical distance to a channel a more realistic, higher potential soil moisture compared to the standard TWI calculation. Boolean, defaults to FALSE
sllgt	Slope Length: Measurement of the distance from the origin of overland flow along its flow path to the location of either concentrated flow or deposition. Boolean, defaults to FALSE
spidx	Stream Power Index: Measure of the erosive power of flowing water. Calculated based upon slope and contributing area. SPI approximates locations where gullies might be more likely to form on the landscape. Needs slope_sgrd and spcar_sgrd parameters. Boolean, defaults to FALSE

loreabad6/terrain documentation built on July 6, 2023, 6:44 a.m.