Select the tiles intersecting the extent — tiles

Function which returns the tile IDs of the Sentinel-2 tiles which overlap a provided extent.

tiles_intersects(extent, all = FALSE, out_format = "id", .s2tiles = NULL)

Arguments

extent	`sf` object with the spatial extent.
all	logical: if TRUE, all the tiles overlapping the extent are provided; if FALSE (default), unnecessary tiles are skipped. Unnecessary tiles are tiles which overlaps the extent for an area already covered by another tile. In case the extent is all included in an overlapping area, only one of the two candidate tiles is returned (the first in alphabetical order).
out_format	character: if "sf", the spatial object of the overlapping tiles is returned; if "id" (default), a character vector with the tile IDs.
.s2tiles	output of `s2_tiles()` function (it is possible to pass it in order to speed up the execution; otherwise leave to NULL and it will be generated within the function).

Value

the tiles intersecting the extent (see argument out_format).

Note

License: GPL 3.0

References

L. Ranghetti, M. Boschetti, F. Nutini, L. Busetto (2020). "sen2r": An R toolbox for automatically downloading and preprocessing Sentinel-2 satellite data. Computers & Geosciences, 139, 104473. doi: 10.1016/j.cageo.2020.104473 , URL: http://sen2r.ranghetti.info/.

Author

Luigi Ranghetti, phD (2019) luigi@ranghetti.info

Examples

ex_extent <- sf::st_read(
  system.file("extdata/vector/scalve.kml", package = "sen2r"),
  quiet = TRUE
)
ex_extent <- ex_extent[1,]

# Tile ID of the required S2 tile
tiles_intersects(ex_extent)
#> [1] "32TNS"

# Tile ID of all the overlapping S2 tiles
tiles_intersects(ex_extent, all = TRUE)
#> [1] "32TNR" "32TNS"

# Spatial object with the required tile
sel_tiles <- tiles_intersects(ex_extent, out_format = "sf")
plot(sf::st_geometry(sel_tiles)); plot(sf::st_geometry(ex_extent), add=TRUE, col="yellow")

# Spatial object with the overlapping S2 tiles
sel_tiles <- tiles_intersects(ex_extent, all = TRUE, out_format = "sf")
plot(sf::st_geometry(sel_tiles)); plot(sf::st_geometry(ex_extent), add=TRUE, col="yellow")