select_bands: Select bands of a data cube

Description Usage Arguments Value Note Examples

View source: R/select_bands.R

Description

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

Usage

1

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

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# 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)

gdalcubes documentation built on Dec. 11, 2021, 9:21 a.m.