r.popgrowth - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

NAME

r.popgrowth - Set of population models (fisheries science)

KEYWORDS

Population growth model

SYNOPSIS

r.popgrowth

r.popgrowth --help

r.popgrowth [-i] n_initial=string timesteps=integer [exponential_output=name] [r_exp_value=float] [r_exp_map=string] [ricker_output=name] [k_value=integer] [k_map=string] [r_rick_value=float] [r_rick_map=string] [population_patches=string] [seed=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-i: Calculate models with rounded integer values
--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

n_initial=string [required]: Map of number of individuals per cell at time t0 (initial population size)
timesteps=integer [required]: Number of time steps; Default: 1
exponential_output=name: Name for exponential model output map
r_exp_value=float: Cell-specific fixed value of intrinsic rate of increase, log(finite rate of increase, lambda)
r_exp_map=string: Map of cell-specific intrinsic rate of increase, log(finite rate of increase, lambda)
ricker_output=name: Name for Ricker model output map
k_value=integer: Fixed value of carrying capacity of the environment (per cell)
k_map=string: Map of carrying capacity of the environment (per cell)
r_rick_value=float: Cell-specific fixed value of intrinsic rate of increase (Ricker)
r_rick_map=string: Map of cell-specific intrinsic rate of increase (Ricker)
population_patches=string: Optional raster map of patches of single populations. If provided, growth models are calculated based on these patches (patch-averaged r and cumulated k).
seed=integer: fixed seed for random rounding

DESCRIPTION
EXAMPLES
SEE ALSO
AUTHOR

DESCRIPTION

r.popgrow calculates classical models of population growths. The module creates a new raster map of population size (abundance) after a specified number of time steps based on an intial populations size (input raster).

Available models for populations growth: Exponential growth and the Ricker model.

EXAMPLES

AUTHOR

Johannes Radinger
Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB)
Berlin, Germany

SOURCE CODE

Available at: r.popgrowth source code (history)

Latest change: Monday Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55