region_slice: Extract a climate slice for a region
In EvolEcolGroup/pastclim: Manipulate Time Series of Palaeoclimate Reconstructions

region_slice

R Documentation

Extract a climate slice for a region

Description

This function extracts a slice of one or more climate variables for a given dataset covering a region (or the whole world). The function returns a SpatRaster terra::SpatRaster object, with each variable as a layer.

Usage

region_slice(
  time_bp = NULL,
  time_ce = NULL,
  bio_variables,
  dataset,
  path_to_nc = NULL,
  ext = NULL,
  crop = NULL
)

Arguments

`time_bp`	the time slice in years before present (negative values represent time before present, positive values time in the future). The slice needs to exist in the dataset. To check which slices are available, you can use `get_time_bp_steps()`.
`time_ce`	time slice in years CE. For available time slices in years CE, use `get_time_ce_steps()`. Only one of `time_bp` or `time_ce` should be used.
`bio_variables`	vector of names of variables to be extracted
`dataset`	string defining the dataset to use. If set to "custom", then a single nc file is used from "path_to_nc"
`path_to_nc`	the path to the custom nc file containing the palaeoclimate reconstructions. All the variables of interest need to be included in this file.
`ext`	an extent, coded as numeric vector (length=4; order= xmin, xmax, ymin, ymax) or a terra::SpatExtent object. If NULL, the full extent of the reconstruction is given.
`crop`	a polygon used to crop the reconstructions (e.g. the outline of a continental mass). A `sf::sfg` or a terra::SpatVector object is used to define the polygon.