reproducible (version 1.2.11)

.prepareFileBackedRaster: Copy the file-backing of a file-backed Raster* object

Description

Rasters are sometimes file-based, so the normal save and copy and assign mechanisms in R don't work for saving, copying and assigning. This function creates an explicit file copy of the file that is backing the raster, and changes the pointer (i.e., filename(object)) so that it is pointing to the new file.

Usage

.prepareFileBackedRaster(
  obj,
  repoDir = NULL,
  overwrite = FALSE,
  drv = getOption("reproducible.drv", RSQLite::SQLite()),
  conn = getOption("reproducible.conn", NULL),
  ...
)

Value

A raster object and its newly located file backing. Note that if this is a legitimate Cache repository, the new location will be a subdirectory called rasters/ of repoDir/. If this is not a repository, the new location will be within repoDir.

Arguments

obj

The raster object to save to the repository.

repoDir

Character denoting an existing directory in which an artifact will be saved.

overwrite

Logical. Should the raster be saved to disk, overwriting existing file.

drv

an object that inherits from DBIDriver, or an existing DBIConnection object (in order to clone an existing connection).

conn

A DBIConnection object, as returned by dbConnect().

...

Not used

Author

Eliot McIntire

Examples

library(raster)
# make a cache repository
a <- Cache(rnorm, 1)

r <- raster(extent(0,10,0,10), vals = 1:100)

# write to disk manually -- will be in tempdir()
r <- writeRaster(r, file = tempfile())

# copy it to the cache repository
r <- .prepareFileBackedRaster(r, tempdir())

r # now in "rasters" subfolder of tempdir()