select_bands: Select bands of a data cube

In appelmar/gdalcubes_R: Earth Observation Data Cubes from Satellite Image Collections

Select bands of a data cube

Description

Create a proxy data cube, which selects specific bands of a data cube. The resulting cube will drop any other bands.

Usage

select_bands(cube, bands)

Arguments

cube	source data cube
bands	character vector with band names

Value

proxy data cube object

Note

This function returns a proxy object, i.e., it will not start any computations besides deriving the shape of the result.

For performance reasons, select_bands should always be called directly on a cube created with raster_cube and drop all unneded bands. This allows to reduce RasterIO and warp operations in GDAL.

Examples

# create image collection from example Landsat data only 
# if not already done in other examples
if (!file.exists(file.path(tempdir(), "L8.db"))) {
  L8_files <- list.files(system.file("L8NY18", package = "gdalcubes"),
                         ".TIF", recursive = TRUE, full.names = TRUE)
  create_image_collection(L8_files, "L8_L1TP", file.path(tempdir(), "L8.db"), quiet = TRUE) 
}

L8.col = image_collection(file.path(tempdir(), "L8.db"))
v = cube_view(extent=list(left=388941.2, right=766552.4, 
              bottom=4345299, top=4744931, t0="2018-04", t1="2018-07"),
              srs="EPSG:32618", nx = 497, ny=526, dt="P1M")
L8.cube = raster_cube(L8.col, v) 
L8.rgb = select_bands(L8.cube, c("B02", "B03", "B04"))
L8.rgb

plot(L8.rgb, rgb=3:1)

appelmar/gdalcubes_R documentation built on March 9, 2024, 10:23 a.m.