project_selected: Project selected models to multiple sets of new data...

In kuenm2: Detailed Development of Ecological Niche Models

Project selected models to multiple sets of new data (scenarios)

Description

This function performs predictions of selected models on multiple scenarios, as specified in a projection_data object created with the prepare_projection() function. In addition to generating predictions for each replicate, the function calculates consensus measures (e.g., mean, median) across replicates and models.

Usage

project_selected(models, projection_data, out_dir, mask = NULL,
                 consensus_per_model = TRUE, consensus_general = TRUE,
                 consensus = c("median", "range", "mean", "stdev"),
                 write_replicates = FALSE, extrapolation_type = "E",
                 var_to_restrict = NULL, type = NULL, overwrite = FALSE,
                 parallel = FALSE, ncores = NULL,
                 progress_bar = TRUE, verbose = TRUE)

Arguments

models	an object of class fitted_models returned by the fit_selected() function.
projection_data	an object of class projection_data returned by the prepare_projection() function. This file contains the paths to the rasters representing each scenario.
out_dir	(character) a path to a root directory for saving the raster file of each projection.
mask	(SpatRaster, SpatVector, or SpatExtent) spatial object used to mask the variables before predict. Default is NULL.
consensus_per_model	(logical) whether to calculate consensus across replicates when there are more than one replicate per model. Default is TRUE.
consensus_general	(logical) whether to calculate consensus across models when there are more than one selected model. Default is TRUE.
consensus	(character) consensus measures to calculate. Options available are 'median', 'range', 'mean' and 'stdev' (standard deviation). Default is c("median", "range", "mean", "stdev").
write_replicates	(logical) whether to write the projections for each replicate. Default is FALSE.
extrapolation_type	(character) extrapolation type of model. Models can be transferred with three options: free extrapolation ('E'), extrapolation with clamping ('EC'), and no extrapolation ('NE'). Default = 'E'. See details.
var_to_restrict	(character) vector specifying which variables to clamp or not to extrapolate for. Only applicable if extrapolation_type is "EC" or "NE". Default is NULL, clamping and no extrapolation will be done for all variables.
type	(character) the format of prediction values. For maxnet models, valid options are "raw", "cumulative", "logistic", and "cloglog". For glm models, valid options are "response" and "raw". If NULL (default), the function uses "cloglog" for maxnet models and "response" for glm models.
overwrite	(logical) whether to overwrite SpatRaster if they already exists. Only applicable if write_files is set to TRUE. Default is FALSE.
parallel	(logical) whether to fit the candidate models in parallel. Default is FALSE.
ncores	(numeric) number of cores to use for parallel processing. Default is NULL and uses available cores - 1. This is only applicable if parallel = TRUE.
progress_bar	(logical) whether to display a progress bar during processing. Default is TRUE.
verbose	(logical) whether to display messages during processing. Default is TRUE.

Value

A model_projections object that provides the paths to the raster files with the projection results and the corresponding thresholds used to binarize the predictions.

See Also

organize_future_worldclim(), prepare_projection()

Examples

# Step 1: Organize variables for current projection
## Import current variables (used to fit models)
var <- terra::rast(system.file("extdata", "Current_variables.tif",
                               package = "kuenm2"))

## Create a folder in a temporary directory to copy the variables
out_dir_current <- file.path(tempdir(), "Current_raw_wc")
dir.create(out_dir_current, recursive = TRUE)

## Save current variables in temporary directory
terra::writeRaster(var, file.path(out_dir_current, "Variables.tif"))


# Step 2: Organize future climate variables (example with WorldClim)
## Directory containing the downloaded future climate variables (example)
in_dir <- system.file("extdata", package = "kuenm2")

## Create a folder in a temporary directory to copy the future variables
out_dir_future <- file.path(tempdir(), "Future_raw_wc")

## Organize and rename the future climate data (structured by year and GCM)
### 'SoilType' will be appended as a static variable in each scenario
organize_future_worldclim(input_dir = in_dir, output_dir = out_dir_future,
                          name_format = "bio_", static_variables = var$SoilType)

# Step 3: Prepare data to run multiple projections
## An example with maxnet models
## Import example of fitted_models (output of fit_selected())
data(fitted_model_maxnet, package = "kuenm2")

## Prepare projection data using fitted models to check variables
pr <- prepare_projection(models = fitted_model_maxnet,
                         present_dir = out_dir_current,
                         future_dir = out_dir_future,
                         future_period = c("2081-2100"),
                         future_pscen = c("ssp126", "ssp585"),
                         future_gcm = c("ACCESS-CM2", "MIROC6"),
                         raster_pattern = ".tif*")

# Step 4: Run multiple model projections
## A folder to save projection results
out_dir <- file.path(tempdir(), "Projection_results/maxnet_projections")
dir.create(out_dir, recursive = TRUE)

## Project selected models to multiple scenarios
p <- project_selected(models = fitted_model_maxnet, projection_data = pr,
                      out_dir = out_dir)

kuenm2 documentation built on April 21, 2026, 1:07 a.m.