Read a dBase (.dbf) attribute table

tda_read_dbf reads a dBase file through TDA's rdbf and returns it as a data frame. Character fields come back as character, numeric ones as numeric, taken from the field types the file itself declares.

Usage

tda_read_dbf(file, options = list(), dir = tempfile("tda"), ...)

Arguments

file

path to a .dbf file.

options

a named list of further TDA options, passed through.

dir

working directory.

...

passed to tda_run.

Value

A data frame; attr(x, "run") carries the run.

Details

This is the attribute half of a shapefile. tda_read_shapefile reads the geometry; the .dbf beside it holds one row per shape with whatever columns the data has, which for real data is usually where the names live. tda_read_shapefile attaches it as attr(x, "attributes").

See also

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

Examples

# a shapefile's .dbf, which sf ships alongside nc.shp
if (requireNamespace("sf", quietly = TRUE)) {
  f <- sub("[.]shp$", ".dbf", system.file("shape/nc.shp", package = "sf"))
  head(tda_read_dbf(f)[, c("NAME", "AREA")])
}
#>          NAME  AREA
#> 1        Ashe 0.114
#> 2   Alleghany 0.061
#> 3       Surry 0.143
#> 4   Currituck 0.070
#> 5 Northampton 0.153
#> 6    Hertford 0.097