select_time

Select time slices of a data cube

Description

Create a proxy data cube, which selects specific time slices of a data cube. The time dimension of the resulting cube will be irregular / labeled.

Usage

select_time(cube, t)

Arguments

Argument Description
cube source data cube
t character vector with date/time

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.

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 = select_time(L8.rgb, c("2018-04", "2018-07"))
L8.rgb
A data cube proxy object

Dimensions:
         low       high count       pixel_size chunk_size                values
t 2018-04-01 2018-07-01     2              P0D          1 2018-04-01,2018-07-01
y    4345299    4744931   526 759.756653992395        384                      
x   388941.2   766552.4   497 759.781086519115        384                      

Bands:
  name offset scale nodata unit
1  B02      0     1    NaN     
2  B03      0     1    NaN     
3  B04      0     1    NaN     
plot(L8.rgb, rgb=3:1)