Spatial data for TDA's spatial commands — tda_spatial • tdaR

Builds TDA's spatial data structure from a data frame of coordinates. Each object – a point, a line or a polygon – is a group of rows sharing an id.

Usage

tda_spatial(
  data,
  id = "id",
  x = "x",
  y = "y",
  attributes = NULL,
  type = 1,
  options = list(),
  dir = tempfile("tda")
)

Arguments

data: a data frame with an id column and two coordinate columns.
id, x, y: the column names.
attributes: further columns to carry along, TDA's av=.
type: type of spatial object, TDA's typ=: 1 for points.
options: a named list of further sdgen options.
dir: working directory; the spatial file is written there and stays for the commands that read it.

Value

A tda_spatial.

See also

Other spatial analysis: plot.tda_spatial(), tda_map(), tda_polygons(), tda_read_dbf(), tda_read_shapefile(), tda_read_spatial, tda_sd(), tda_sd_analyses, tda_sd_ps3()

Examples

d <- data.frame(id = 1:4, x = c(0, 1, 1, 0), y = c(0, 0, 1, 1))
s <- tda_spatial(d)
tda_sd_info(s)
#> Call: tda_sd_info(s)
#> 
#> Cases: 4 
#> 
#>  points lines polygons xmin ymin xmax ymax
#>       4     0        0    0    0    1    1