R: Select bands of a data cube

select_bands {gdalcubes} | R Documentation

## 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"))
    }

    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)

[Package gdalcubes version 0.6.0 Index]