Make a depth-stratified survey grid

Source: R/make_grid.R

This function sets up a depth-stratified survey grid. A simple gradient in depth is simulated using stats::spline() (default), with a shallow portion, shelf, and deep portion. Optionally, covariance can be added to the depth simulation.

make_grid(
  x_range = c(-140, 140),
  y_range = c(-140, 140),
  res = c(3.5, 3.5),
  shelf_depth = 200,
  shelf_width = 100,
  depth_range = c(0, 1000),
  n_div = 1,
  strat_breaks = seq(0, 1000, by = 40),
  strat_splits = 2,
  method = "spline"
)

Arguments

x_range

Range (min x, max x) in the x dimension (km).

y_range

Range (min y, max y) in the y dimension (km).

res

Resolution of the grid cells (km).

shelf_depth

Approximate depth of the shelf (m).

shelf_width

Approximate width of the shelf (km).

depth_range

Range (min depth, max depth) of the depth values (m).

n_div

Number of divisions to include.

strat_breaks

Depth breaks used to define strata.

strat_splits

Number of times to horizontally split strata (i.e., a way to increase the number of strata).

method

Choose "spline", "loess", or "bezier" to generate a smooth gradient, or use "linear" for linear interpolation.

Value

A stars object with 2 dimensions (x and y) and 4 attributes (depth, cell, division, strat).

See also

survey_grid

Examples

r <- make_grid(res = c(10, 10))
plot(r)


p <- sf::st_as_sf(r["strat"], as_points = FALSE, merge = TRUE)
plot(p)