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)