raster: datasource – R documentation

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datasource

Are values in memory and/or on disk?

Description

These are helper functons for programmers and for debugging that provide information about whether a Raster object has associated values, and if these are in memory or on disk.

fromDisk is TRUE if the data source is a file on disk; and FALSE if the object only exists in memory.

inMemory is TRUE if all values are currently in memory (RAM); and FALSE if not (in which case they either are on disk, or there are no values).

hasValues is TRUE if the object has cell values.

Usage

fromDisk(x)
inMemory(x)
## S4 method for signature 'BasicRaster'
hasValues(x, ...)

Arguments

`x`	Raster* object
`...`	additional arguments. None implemented

Value

Logical

Examples

rs <- raster(system.file("external/test.grd", package="raster"))
inMemory(rs)
fromDisk(rs)
rs <- readAll(rs)
inMemory(rs)
fromDisk(rs)
rs <- rs + 1
inMemory(rs)
fromDisk(rs)
rs <- raster(rs)
inMemory(rs)
fromDisk(rs)
rs <- setValues(rs, 1:ncell(rs))
inMemory(rs)
fromDisk(rs)
#rs <- writeRaster(rs, filename=rasterTmpFile(), overwrite=TRUE)
#inMemory(rs)
#fromDisk(rs)

raster

Geographic Data Analysis and Modeling

v3.4-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]

Initial release

2021-05-02