Crop a mosaic — mosaic

Crop a SpatRaster object based on user-defined selection using an interactive map or plot.

Usage

mosaic_crop(
  mosaic,
  r = 3,
  g = 2,
  b = 1,
  re = 4,
  nir = 5,
  show = c("rgb", "index"),
  index = "R",
  max_pixels = 5e+05,
  downsample = NULL,
  ...
)

Arguments

mosaic: A mosaic of class SpatRaster, generally imported with mosaic_input().
r: The layer for the Red band (default: 3).
g: The layer for the Green band (default: 2).
b: The layer for the Blue band (default: 1).
re: The layer for the Red-edge band (default: 4).
nir: The layer for the Near-infrared band(default: 5).
show: The display option for the map view. Options are "rgb" for RGB view and "index" for index view.
index: The index to use for the index view. Defaults to "B".
max_pixels: Maximum number of pixels to render in the map or plot (default: 500000).
downsample: Downsampling factor to reduce the number of pixels (default: NULL). In this case, if the number of pixels in the image (width x height) is greater than max_pixels a downsampling factor will be automatically chosen so that the number of plotted pixels approximates the max_pixels.
...: Additional arguments passed to mosaic_view().

Value

A cropped version of mosaic based on the user-defined selection.

Details

This function uses the mosaic_view function to display an interactive map or plot of the mosaic raster, allowing users to draw a rectangle to select the cropping area. The selected area is then cropped from the input mosaic and returned as a new SpatRaster object.

Examples

if(interactive()){
library(pliman)
# Load a raster showing the elevation of Luxembourg
mosaic <- mosaic_input(system.file("ex/elev.tif", package="terra"))

# Generate an interactive map using 'mapview' (works only in an interactive section)
cropped <- mosaic_crop(mosaic)
mosaic_view(cropped)
}