BIOMOD_Projection: Project a range of calibrated species distribution models onto new environment

Description

This function allows to project a range of models built with the BIOMOD_Modeling function onto new environmental data (which can represent new areas, resolution or time scales for example).

Usage

BIOMOD_Projection(
  bm.mod,
  proj.name,
  new.env,
  new.env.xy = NULL,
  models.chosen = "all",
  metric.binary = NULL,
  metric.filter = NULL,
  compress = TRUE,
  build.clamping.mask = TRUE,
  nb.cpu = 1,
  seed.val = NULL,
  ...
)

Value

A BIOMOD.projection.out object containing models projections, or links to saved outputs.
Models projections are stored out of R (for memory storage reasons) in proj.name folder created in the current working directory :

the output is a 4-dimensional array if new.env is a matrix or a data.frame
it is a RasterStack if new.env is a RasterStack (or several RasterLayer objects, if new.env is too large)
raw projections, as well as binary and filtered projections (if asked), are saved in the proj.name folder

Arguments

bm.mod: a BIOMOD.models.out object returned by the BIOMOD_Modeling function
proj.name: a character corresponding to the name (ID) of the projection set (a new folder will be created within the simulation folder with this name)
new.env: a matrix, data.frame or RasterStack object containing the new explanatory variables (in columns or layers, with names matching the variables names given to the BIOMOD_FormatingData function to build bm.mod) that will be used to project the species distribution model(s)
new.env.xy: (optional, default NULL)
If new.env is a matrix or a data.frame, a 2-columns matrix or data.frame containing the corresponding X and Y coordinates that will be used to project the species distribution model(s)
models.chosen: a vector containing model names to be kept, must be either all or a sub-selection of model names that can be obtained with the get_built_models function
metric.binary: (optional, default NULL)
A vector containing evaluation metric names to be used to transform prediction values into binary values based on models evaluation scores obtained with the BIOMOD_Modeling function. Must be among all (same evaluation metrics than those of bm.mod) or ROC, TSS, KAPPA, ACCURACY, BIAS, POD, FAR, POFD, SR, CSI, ETS, HK, HSS, OR, ORSS
metric.filter: (optional, default NULL)
A vector containing evaluation metric names to be used to transform prediction values into filtered values based on models evaluation scores obtained with the BIOMOD_Modeling function. Must be among all (same evaluation metrics than those of bm.mod) or ROC, TSS, KAPPA, ACCURACY, BIAS, POD, FAR, POFD, SR, CSI, ETS, HK, HSS, OR, ORSS
compress: (optional, default TRUE)
A logical or a character value defining whether and how objects should be compressed when saved on hard drive. Must be either TRUE, FALSE, xz or gzip (see Details)
build.clamping.mask: (optional, default TRUE)
A logical value defining whether a clamping mask should be built and saved on hard drive or not (see Details)
nb.cpu: (optional, default 1)
An integer value corresponding to the number of computing resources to be used to parallelize the single models computation
seed.val: (optional, default NULL)
An integer value corresponding to the new seed value to be set
...: (optional, see Details))

Author

Wilfried Thuiller, Damien Georges

Details

If models.chosen = 'all', projections are done for all evaluation and pseudo absences runs if applicable.
These projections may be used later by the BIOMOD_EnsembleForecasting function.

If build.clamping.mask = TRUE, a raster file will be saved within the projection folder. This mask values will correspond to the number of variables in each pixel that are out of their calibration / training range, identifying locations where predictions are uncertain.

... can take the following values :

omit.na : a logical value defining whether all not fully referenced environmental points will get NA as predictions or not
on_0_1000 : a logical value defining whether 0 - 1 probabilities are to be converted to 0 - 1000 scale to save memory on backup
do.stack : a logical value defining whether all projections are to be saved as one RasterStack object or several RasterLayer files (the default if projections are too heavy to be all loaded at once in memory)
keep.in.memory : a logical value defining whether all projections are to be kept loaded at once in memory, or only links pointing to hard drive are to be returned
output.format : a character value corresponding to the projections saving format on hard drive, must be either .grd, .img or .RData (the default if new.env is given as matrix or data.frame)

Examples

Run this code


# Load species occurrences (6 species available)
myFile <- system.file('external/species/mammals_table.csv', package = 'biomod2')
DataSpecies <- read.csv(myFile, row.names = 1)
head(DataSpecies)

# Select the name of the studied species
myRespName <- 'GuloGulo'

# Get corresponding presence/absence data
myResp <- as.numeric(DataSpecies[, myRespName])

# Get corresponding XY coordinates
myRespXY <- DataSpecies[, c('X_WGS84', 'Y_WGS84')]

# Load environmental variables extracted from BIOCLIM (bio_3, bio_4, bio_7, bio_11 & bio_12)
myFiles <- paste0('external/bioclim/current/bio', c(3, 4, 7, 11, 12), '.grd')
myExpl <- raster::stack(system.file(myFiles, package = 'biomod2'))

# \dontshow{
myExtent <- raster::extent(0,30,45,70)
myExpl <- raster::stack(raster::crop(myExpl, myExtent))
# }

# ---------------------------------------------------------------
file.out <- paste0(myRespName, "/", myRespName, ".AllModels.models.out")
if (file.exists(file.out)) {
  myBiomodModelOut <- get(load(file.out))
} else {

  # Format Data with true absences
  myBiomodData <- BIOMOD_FormatingData(resp.var = myResp,
                                       expl.var = myExpl,
                                       resp.xy = myRespXY,
                                       resp.name = myRespName)

  # Create default modeling options
  myBiomodOptions <- BIOMOD_ModelingOptions()

  # Model single models
  myBiomodModelOut <- BIOMOD_Modeling(bm.format = myBiomodData,
                                      modeling.id = 'AllModels',
                                      models = c('RF', 'GLM'),
                                      bm.options = myBiomodOptions,
                                      nb.rep = 2,
                                      data.split.perc = 80,
                                      metric.eval = c('TSS','ROC'),
                                      var.import = 3,
                                      do.full.models = FALSE,
                                      seed.val = 42)
}


# ---------------------------------------------------------------
# Project single models
myBiomodProj <- BIOMOD_Projection(bm.mod = myBiomodModelOut,
                                  proj.name = 'Current',
                                  new.env = myExpl,
                                  models.chosen = 'all',
                                  metric.binary = 'all',
                                  metric.filter = 'all',
                                  build.clamping.mask = TRUE)
myBiomodProj
plot(myBiomodProj)

Run the code above in your browser using DataLab