Specify parameters to load raster in blocks — st_tile • stars

Helper function for specifying the block parameters (nXOff, nYOff, nXsize, and nYSize) required by RasterIO argument in read_stars

Usage

st_tile(img_rows, img_cols, x_window, y_window, overlap = 0)

Arguments

img_rows: number of input raster rows (integer)
img_cols: number of input raster columns (integer)
x_window: number of rows in block (integer)
y_window: number of columns in block (integer)
overlap: number of overlapping pixels (integer)

Value

matrix with specified nXOff, nYOff, nXsize, and nYSize parameters for every block

Examples

if (FALSE) {
tif = system.file("tif/L7_ETMs.tif", package = "stars")
r = read_stars(tif, proxy = TRUE)
tiles = st_tile(nrow(r), ncol(r), 256, 256)
for (i in seq_len(nrow(tiles))) {
  tile = read_stars(tif, proxy = FALSE, RasterIO = tiles[i, ])
  # write tiles to separate files
  write_stars(tile, dsn = paste0(i, ".tif"))
}
}