| datasource {raster} | R Documentation |
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.
fromDisk(x) inMemory(x) hasValues(x)
x |
Raster* object |
Logical value
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='test', overwrite=TRUE)
inMemory(rs)
fromDisk(rs)