This function can be used to suggest chunk sizes (always a number of entire rows), and corresponding row numbers, to be used when processing Raster* objects in chunks. Normally used together with writeValues.
Usage
# S4 method for Raster
blockSize(x, chunksize, n=nlayers(x), minblocks=4, minrows=1)
Value
A list with three elements:
rows, the suggested row numbers at which to start the blocks for reading and writing,
nrows, the number of rows in each block, and,
n, the total number of blocks
Arguments
x
Raster* object
chunksize
Integer, normally missing. Can be used to set the block size; unit is number of cells. Block size is then computed in units of number of rows (always >= 1)
n
Integer. number of layers to consider. The function divides chunksize by n to determine blocksize