Sample a layer's feature properties

Lets you discover what an inlined vector layer can be styled or filtered by without reading every feature back.

Usage

layer_properties(x, layer)

Arguments

x

A GeoLibre widget or a project list.

layer

A layer id or layer name.

Value

A named list mapping each property name to up to 25 distinct sample values, in first-seen order.

Examples

point <- list(
  type = "Feature", properties = list(name = "DC", pop = 700000),
  geometry = list(type = "Point", coordinates = c(-77, 39))
)
map <- geolibre() |> add_geojson(point, name = "Places")
layer_properties(map, "Places")
#> $name
#> $name[[1]]
#> [1] "DC"
#> 
#> 
#> $pop
#> $pop[[1]]
#> [1] 7e+05
#> 
#>